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3.A.1 The ATP-binding Cassette (ABC) Superfamily

The ABC superfamily contains both uptake and efflux transport systems, and the members of these two porter groups generally cluster loosely together with just a few exceptions (Saurin et al., 1999). ATP hydrolysis without protein phosphorylation energizes transport. There are dozens of families within the ABC superfamily, and family generally correlates with substrate specificity. However there are exceptions. The high resolution X-ray structures of several ABC transporters, both uptake and efflux systems, have been determined, and specific details of the transport mechanisms have been proposed (Davidson and Maloney, 2007; Lee et al., 2007). Several multidrug resistance (MDR) transporters catalyze lipid, lipopolysaccharide, and/or lipoprotein export. This can occur by a 'flip-flop' mechanism or a 'projection' mechanism (Nagao et al., 2010). Pagès et al. (2011) have described several classes of efflux pump inhibitors that counteract MDR. Known structures have been discussed by Zolnerciks et al. (2011).

Switch and constant contact models have been presented (George and Jones, 2012).  The prevailing paradigm for the ABC transport mechanism is the Switch Model, in which the nucleotide binding domains are proposed to dimerise upon binding of two ATP molecules, and thence dissociate upon sequential hydrolysis of the ATP. This idea appears consistent with crystal structures of both isolated subunits and whole transporters, as well as with the biochemical data. Nonetheless, an alternative Constant Contact Model has been proposed, in which the nucleotide binding domains do not fully dissociate, and ATP hydrolysis occurs alternately at each of the two active sites (Jones and George 2012).  In this model, one of the sites remains closed and contains an occluded nucleotide at all times. The cassettes remain in contact, and the active sites swing open in an alternately seesawing motion. Whilst the concept of NBD association/dissociation in the Switch Model is naturally compatible with a single alternating-access channel, the asymmetric functioning proposed by the Constant Contact model suggests an alternating or reciprocating function in the TMDs. A new model for the function of ABC transporters has been proposed by Jones and George 2014 in which the sequence of ATP binding, hydrolysis, and product release in each active site is directly coupled to the analogous sequence of substrate binding, translocation and release in one of two functionally separate substrate translocation pathways. Each translocation pathway functions 180 degrees out of phase.

As noted above, the porters of the ABC superfamily consist of two integral membrane domains/proteins and two cytoplasmic domains/proteins. The uptake systems (but not the efflux systems) usually possess extracytoplasmic solute-binding receptors (one or more per system) which in Gram-negative bacteria are found in the periplasm, and in Gram-positive bacteria is present either as a lipoprotein, tethered to the external surface of the cytoplasmic membrane, or as a cell surface-associated protein, bound to the external membrane surface via electrostatic interactions. For those systems with two or more extracytoplasmic solute binding receptors, the receptors may interact in a cooperative fashion (Biemans-Oldehinkel and Poolman, 2003). These binding proteins fall into six phylogenetic clusters (Berntsson et al., 2010). Both the integral membrane channel constituent(s) and the cytoplasmic ATP-hydrolyzing constituent(s) may be present as homodimers or heterodimers. Two families of ABC transporters have members in which one or two receptors are fused to either the N- or C-terminus of the translocating membrane protein. This suggests that two or even four substrate-binding sites may function in the complex. Possibly multiple receptors in proximity to the translocator enhances the transport rate. Multiple receptors may also broaden the substrate specificity of the system (van der Heide and Poolman, 2002). These systems with covalent receptor domains linked to the transmembrane translocators are found in the PAAT family (TC #3.A.1.3) and the QAT family (TC #3.A.1.12) (van der Heide and Poolman, 2002). Some high affinity ABC uptake systems specific for vitamins, minerals and other small molecules, called ECF systems, lack an extracytoplasm receptor and function by a mechanisms as discussed by Slotboom 2014.

ABC transporters always have two nucleotide binding domains (NBDs). ATP-bound NBDs dimerize in a head-to-tail arrangement, with two nucleotides sandwiched at the dimer interface. Both NBDs contribute residues to each of the two nucleotide-binding sites (NBSs) in the dimer. The prototypical NBD MJ0796 from Methanocaldococcus jannaschii forms ATP-bound dimers that dissociate completely following hydrolysis of one of the two bound ATP molecules.  ATP hydrolysis at one nucleotide-binding site drives NBD dissociation, but two binding sites are required to form the ATP-sandwich NBD dimer necessary for hydrolysis (Zoghbi and Altenberg 2013). 

 

The TC system of classification uses the integral membrane proteins, not the energy coupling proteins, receptor, or auxiliary subunits to classify the system into families (Saier, 1994; 2000). The exception to this rule was the ABC superfamily which by engrained tradition was classified based on the use of an ATP-binding cassette (ABC) ATPase for energy coupling before the TC system was designed. Since then it has become known that the membrane proteins of ABC export systems fall into three evolutionarily distinct families that followed three different pathways of origin (Wang et al., 2009). These have been designated ABC1, ABC2 and ABC3. ABC1 porters arose by triplication of a primordial 2 TMS element; ABC2 porters arose by duplication of a 3 TMS element, and ABC3 porters arose from a 4 TMS precursor that either remained as two 4 TMS proteins (a homo or hetero dimer) or internally duplicated to give 8 or 10 proteins, the extra two appear to be in the center between the two 4 TMS repeat units (Khwaja et al. 2005). The ABC functional superfamily therefore consists of three true superfamilies. The ABC subfamiies or clusters that belong to each of these three superfamilies are listed below. 

ABC1:
3.A.1.106 The Lipid Exporter (LipidE) Family
3.A.1.108 The β-Glucan Exporter (GlucanE) Family
3.A.1.109 The Protein-1 Exporter (Prot1E) Family
3.A.1.110 The Protein-2 Exporter (Prot2E) Family
3.A.1.111 The Peptide-1 Exporter (Pep1E) Family
3.A.1.112 The Peptide-2 Exporter (Pep2E) Family
3.A.1.113 The Peptide-3 Exporter (Pep3E) Family
3.A.1.117 The Drug Exporter-2 (DrugE2) Family
3.A.1.118 The Microcin J25 Exporter (McjD) Family
3.A.1.119 The Drug/Siderophore Exporter-3 (DrugE3) Family
3.A.1.123 The Peptide-4 Exporter (Pep4E) Family
3.A.1.127 The AmfS Peptide Exporter (AmfS-E) Family
3.A.1.129 The CydDC Cysteine Exporter (CydDC-E) Family
3.A.1.135 The Drug Exporter-4 (DrugE4) Family
3.A.1.139 The UDP-Glucose Exporter (U-GlcE) Family (UPF0014 Family)
3.A.1.201 The Multidrug Resistance Exporter (MDR) Family (ABCB)
3.A.1.202 The Cystic Fibrosis Transmembrane Conductance Exporter (CFTR) Family (ABCC)
3.A.1.203 The Peroxysomal Fatty Acyl CoA Transporter (P-FAT) Family (ABCD)
3.A.1.206 The a-Factor Sex Pheromone Exporter (STE) Family (ABCB)
3.A.1.208 The Drug Conjugate Transporter (DCT) Family (ABCC) (Dębska et al., 2011)
3.A.1.209 The MHC Peptide Transporter (TAP) Family (ABCB)
3.A.1.210 The Heavy Metal Transporter (HMT) Family (ABCB)
3.A.1.212 The Mitochondrial Peptide Exporter (MPE) Family (ABCB)
3.A.1.21   The Siderophore-Fe3+ Uptake Transporter (SIUT) Family

ABC2:
3.A.1.101 The Capsular Polysaccharide Exporter (CPSE) Family
3.A.1.102 The Lipooligosaccharide Exporter (LOSE) Family
3.A.1.103 The Lipopolysaccharide Exporter (LPSE) Family
3.A.1.104 The Teichoic Acid Exporter (TAE) Family
3.A.1.105 The Drug Exporter-1 (DrugE1) Family
3.A.1.107 The Putative Heme Exporter (HemeE) Family
3.A.1.115 The Na+ Exporter (NatE) Family
3.A.1.116 The Microcin B17 Exporter (McbE) Family
3.A.1.124 The 3-component Peptide-5 Exporter (Pep5E) Family
3.A.1.126 The β-Exotoxin I Exporter (βETE) Family
3.A.1.128 The SkfA Peptide Exporter (SkfA-E) Family
3.A.1.130 The Multidrug/Hemolysin Exporter (MHE) Family
3.A.1.131 The Bacitracin Resistance (Bcr) Family
3.A.1.132 The Gliding Motility ABC Transporter (Gld) Family
3.A.1.133 The Peptide-6 Exporter (Pep6E) Family
3.A.1.138 The Unknown ABC-2-type (ABC2-1) Family
3.A.1.141 The Ethyl Viologen Exporter (EVE) Family (DUF990 Family)
3.A.1.142 The Glycolipid Flippase (G.L.Flippase) Family
3.A.1.143 The Exoprotein Secretion System (EcsAB(C))
3.A.1.204 The Eye Pigment Precursor Transporter (EPP) Family (ABCG)
3.A.1.205 The Pleiotropic Drug Resistance (PDR) Family (ABCG)
3.A.1.211 The Cholesterol/Phospholipid/Retinal (CPR) Flippase Family (ABCA)
9.B.74      The Phage Infection Protein (PIP) Family
all uptake systems (3.A.1.1 - 3.A.1.34 except 3.A.1.21) 

ABC3:
3.A.1.114 The Probable Glycolipid Exporter (DevE) Family
3.A.1.122 The Macrolide Exporter (MacB) Family
3.A.1.125 The Lipoprotein Translocase (LPT) Family
3.A.1.134 The Peptide-7 Exporter (Pep7E) Family
3.A.1.136 The Uncharacterized ABC-3-type (U-ABC3-1) Family
3.A.1.137 The Uncharacterized ABC-3-type (U-ABC3-2) Family
3.A.1.140 The FtsX/FtsE Septation (FtsX/FtsE) Family
3.A.1.207 The Eukaryotic ABC3 (E-ABC3) Family

Uptake systems are believed to be almost exclusively of the ABC2 type, but they have undergone extensive sequence and topological diversification. The only exception is ABC family 3.A.1.21, the Siderophore-Fe3+ Uptake Transporter (SIUT) Family which is of the ABC1 type. It has no extracytoplasmic receptor as well.

Unlike most uptake systems which have one or two functionally equivalent membrane subunits that form a homo- or hetero-dimer and an extracytoplasmic receptor, a subset of these porters have two functionally dissimilar membrane subunits, called S (substrate recognition) and T (transducer) that are very divergent in sequence, and they lack extracytoplasmic receptors (Erkens et al. 2012). This group of ABC2 porters represent a subfamily within the ABC2 uptake systems. This subfamily includes:

ECF:
3.A.1.18 The Cobalt Uptake Transporter (CoT) Family 
3.A.1.22 The Nickel Uptake Transporter (NiT) Family
3.A.1.23 The Nickel/Cobalt Uptake Transporter (NiCoT) Family
3.A.1.25 The Biotin Uptake Transporter (BioMNY) Family
3.A.1.26 The Putative Thiamine Uptake Transporter (ThiW) Family
3.A.1.28 The Queuosine (Queuosine) Family
3.A.1.29 The Methionine Precursor (Met-P) Family
3.A.1.30 The Thiamin Precursor (Thi-P) Family
3.A.1.31 The Unknown-ABC1 (U-ABC1) Family
3.A.1.32 The Cobalamin Precursor (B12-P) Family
3.A.1.33 The Methylthioadenosine (MTA) Family
S-subunits are homologous to:
2.A.87 The Prokaryotic Riboflavin Transporter (P-RFT) Family
2.A.88 The Vitamin Uptake Transporter (VUT or ECF) Family

Karpowich and Wang (2013) characterized the ECF transporters from Thermotoga maritima and Streptococcus thermophilus and determined a subunit stoichiometry of 2S:2T:1A:1A'.  They concluded that S subunits for different substrates can be incorporated into the same transporter complex simultaneously. In the crystal structure of the A-A' heterodimer, each subunit contains a novel motif called the Q-helix that plays a role in subunit coupling with the T subunits. A mechanism for coupling ATP binding and hydrolysis to transmembrane transport by ECF transporters was proposed.

The maltose import transporter is composed of two TM subunits, MalF and MalG, and two subunits of a cytoplasmic ATPase, MalK. Like many uptake systems in Gram-negative bacteria, the periplasmic maltose-binding protein (MBP), is required to stimulate the ATPase activity of the transporter. In the absence of maltose, MBP exists in equilibrium between an open and closed conformation, and binding of maltose stabilizes the closed conformation. Two structures of MalFGK2 have been determined by x-ray crystallography. In the absence of MBP, MalFGK2 forms an inward-facing conformation with the TM maltose-binding site exposed to the cytoplasm. An outward-facing conformation, crystallized in complex with open MBP and ATP, shows that closure of the NBDs of MalK is concomitant with transfer of maltose from MBP to the TM subunits. These structures capture two states in the transport cycle: The inward-facing conformation represents the resting state where the transporter has a very low ATPase activity, and the outward-facing conformation represents a catalytic intermediate where ATP is poised for hydrolysis. Because MBP stimulates ATP hydrolysis and initiates the transport process, it must interact with the resting state conformation to form a 'pretranslocation' complex that is metastable in order to advance to the outward-facing conformation in the presence of ATP (25). Oldham and Chen (2011) presented the crystal structure of the initial complex formed between closed MBP and MalFGK2. As an essential intermediate between the inward- and outward-facing conformations, this structure suggests a mechanism by which substrate bound on the periplasmic surface influences the conformation of the NBDs at the intracellular surface. The same investigators suggested that ABC transporters catalyze ATP hydrolysis via a general base mechanism (Oldham and Chen, 2011).

The homodimeric LmrA drug efflux pump (TC #3.A.1.117.1) of Lactococcus lactis appears to function by an alternating site (half of sites) type mechanism. In many of these porters, the various domains are fused in a variety of combinations. Uptake porters generally have their constituents as distinct polypeptide chains, while efflux systems usually have them fused. ABC-type uptake systems have not been identified in eukaryotes, but ABC-type efflux systems abound in both prokaryotes and eukaryotes. The eukaryotic efflux systems often have the four domains (two cytoplasmic domains and two integral membrane domains) fused into either one or two polypeptide chains. The integral membrane porter domains each usually possesses 5 (uptake) or 6 (efflux) transmembrane spanners, but exceptions exist. For example, the MntB protein (TC #3.A.1.15.1) exhibits 9 established TMSs. The 3-dimensional structure of the E. coli MsbA protein (TC #3.A.1.106.1) has been solved to a resolution of 3.7 Å (Ward et al., 2007), that of the Staphylococcus aureus Sav1866 protein (TC #3.A.1.106.2) has been solved to a resolution of 3.0 Å (Dawson and Locher, 2006), that of the Archaeoglobus fulgidus ModABC complex has been solved at 3.1 Å resolution (Hollenstein et al., 2007), that of the E. coli BtuCDF Vitamin B12 transporter was solved at 2.6 Å resolution (Hvorup et al., 2007), and the maltose transporter has been solved at 2.8 Å resolution (Oldham et al., 2007). These structures are very different, but the two transmembrane domains form a single barrel 5-6 nm in diameter and about 5 nm deep with an entral pore open either to the external or internal surface spanning much of the membrane (Rosenberg et al., 2003). A model has been proposed allowing the channel to open up to the lipid bilayer. A half of sites model in which the two nucleotide binding domains interact in a fashion controlled by substrate binding has also been proposed (Hou et al., 2003; Loo et al., 2003).

Hollenstein et al. (2007) presented the 3.1 Å crystal structure of a putative molybdate transporter (ModB2C2) from Archaeoglobus fulgidus in complex with its binding protein (ModA). Twelve transmembrane helices of the ModB subunits provide an inward-facing conformation, with a closed gate near the external membrane boundary. The ATP-hydrolyzing ModC subunits reveal a nucleotide-free, open conformation, whereas the attached binding protein aligns the substrate-binding cleft with the entrance to the presumed translocation pathway. Structural comparison of ModB2C2A with Sav1866 suggests a common alternating access and release mechanism, with binding of ATP promoting an outward-facing conformation and dissociation of the hydrolysis products promoting an inward-facing conformation. ATP hydrolysis at one of the two sites in ABC transporters initiates transport-related conformational transitions (Gyimesi et al., 2011).

Smriti et al., 2009 mapped residues proximal to the daunorubicin (DNR)-binding site in MsbA (TC#3.A.1.106.1) using site-specific, ATP-dependent quenching of DNR intrinsic fluorescence by spin labels. In the nucleotide-free MsbA intermediate, DNR-binding residues cluster at the cytoplasmic end of helices 3 and 6 at a site accessible from the membrane/water interface and extending into an aqueous chamber formed at the interface between the two transmembrane domains. Binding of a nonhydrolyzable ATP analog inverts the transporter to an outward-facing conformation. DNR may thus enter near an elbow helix parallel to the water/membrane interface, partitioning into the open chamber, and then translocating toward the periplasm upon ATP binding.

The turnover rates of some transporters are inhibited by their substrates in a process termed trans-inhibition. Gerber et al. (2008) presented the crystal structure of a molybdate/tungstate ABC transporter (ModBC) from Methanosarcina acetivorans in a trans-inhibited state. The regulatory domains of the nucleotide-binding subunits proved to be in close contact, providing two oxyanion binding pockets at the shared interface. By specifically binding to these pockets, molybdate or tungstate prevent adenosine triphosphatase activity and lock the transporter in an inward-facing conformation, with the catalytic motifs of the nucleotide-binding domains separated. This allosteric effect prevents the transporter from switching between the inward-facing and the outward-facing states, thus interfering with the alternating access and release mechanism.

The cystic fibrosis transmembrane conductance regulator (CFTR; 3.A.1.202.1) is an ATP-dependent chloride channel. Jordan et al., 2008 compared CFTR protein sequences to those of ABCC4 proteins (the closest mammalian paralogs) to identify the evolutionary transition from transporter to channel activity. R352 in the sixth transmembrane helix interacts with D993 in TM9 to stabilize the open-channel state; D993 is absolutely conserved between CFTRs and ABCC4s. Thus CFTR channel activity evolved, at least in part, by converting the conformational changes associated with binding and hydrolysis of ATP, as are found in true ABC transporters, into an open permeation pathway by means of intraprotein interactions that stabilize the open state.  In general, plant ABC transport systems are more numerous than those in animals.  The maize systems have been categorized and their expression profiles have been determined (Pang et al. 2013).

The LolCDE complex of Escherichia coli (TC# 3.A.1.125.1) initiates the lipoprotein sorting to the outer membrane by catalysing their release from the inner membrane. LolC and/or LolE, membrane subunits, recognize lipoproteins anchored to the outer surface of the inner membrane, while LolD hydrolyses ATP on its inner surface. The ligand-bound LolCDE has been purified from the inner membrane in the absence of ATP (Ito et al., 2006). Liganded LolCDE represents an intermediate of the release reaction and exhibits higher affinity for ATP than the unliganded form. ATP binding to LolD weakens the interaction between LolCDE and lipoproteins and causes their dissociation in a detergent solution, while lipoprotein release from membranes requires ATP hydrolysis. A single molecule of lipoprotein is found to bind per molecule of the LolCDE complex.

The three structurally dissimilar constituents of the ABC uptake porters have generally arisen from a common ancestral porter system with minimal shuffling of constituents between/domain constituents is almost always the same. However the rates of sequence divergences differ drastically with the extracytoplasmic solute-binding receptors diverging most rapidly, the integral-membrane, channel-forming constituents diverging at an intermediate rate, and the cytoplasmic ATP-hydrolyzing constituents diverging most slowly. Thus, all ATP-hydrolyzing constituents are demonstrably homologous, but this is not true for the integral membrane constituents or the receptors. Nevertheless, clustering patterns are generally the same for all three types of proteins, and 3-dimensional structural data suggest that, in spite of their extensive sequence divergence, the extracytoplasmic solute-binding receptors are homologous to each other.

Unlike most of the known ABC transporters, ABCC1 (TC #3.A.1.208.8) has an additional membrane-spanning domain (MSD) at its amino terminus with a domain arrangement of MSD0-MSD1-NBD1-MSD2-NBD2. The additional MSD0 domain consists of five putative transmembrane segments with a predicted extracellular amino terminus. It has a U-shaped folding with the bottom of the U-structure facing cytoplasm and both ends in extracellular space. This U-shaped amino terminus probably functions as a gate to regulate the drug transport activity of human ABCC1 (Chen et al., 2006).

Polar lipid trafficking is essential in eukaryotic cells as membranes of lipid assembly are often distinct from final destination membranes. A striking example is the biogenesis of the photosynthetic membranes (thylakoids) in plastids of plants. Lipid biosynthetic enzymes at the endoplasmic reticulum and the inner and outer plastid envelope membranes are involved. This compartmentalization requires extensive lipid trafficking. Mutants of Arabidopsis disrupt the incorporation of endoplasmic reticulum-derived lipid precursors into thylakoid lipids. Two proteins affected in two of these mutants, trigalactosyldiacylglycerol 1 (TGD1) and TGD2, encode the permease and substrate binding component, respectively, of a proposed lipid translocator at the inner chloroplast envelope membrane. A third protein, TGD3, a small ABC-type ATPase, energizer transport. As in the tgd1 and tgd2 mutants, triacylglycerols and trigalactolipids accumulate in a tgd3 mutant. The TGD3 protein shows basal ATPase activity and is localized inside the chloroplast beyond the inner chloroplast envelope membrane. Proteins orthologous to TGD1, -2, and -3 are predicted to be present in Gram-negative bacteria, and the respective genes are organized in operons suggesting a common biochemical role for the gene products. The Tgd1,2,3 system (TC#3.A.1.27.2) probably transfers ER-derived lipids to the thylakoid membrane (Lu et al., 2007). It is one of the few known eukaryotic uptake systems.

Some transporters have a conserved transmembrane protein and two nucleotide binding proteins similar to those of ABC transporters. However, unlike typical ABC transporters (E.I. Sun & M.H. Saier, unpublished results), they use small integral membrane proteins that are postulated to capture specific substrates. Our studies have shown that both of these integral membrane protein constituents of these systems are distantly related but homologous, and in this respect they resemble typical ABC porters. We postulate that these two transmembrane proteins comprise the pathway for transmembrane transport.

Rodionov et al., 2009 identified 21 families of these substrate capture proteins, each with a different specificity predicted by genome context analyses. Roughly half of the substrate capture proteins (335 cases) examined by Rodionov et al., 2009 have a dedicated energizing module, but in 459 cases distributed among almost 100 gram-positive bacteria, different and unrelated substrate capture proteins share the same energy-coupling module. The shared use of energy-coupling modules was experimentally confirmed for folate, thiamine, and riboflavin transporters. Rodionov et al., 2009 proposed the name energy-coupling factor transporters for the new class of putative ABC membrane transporters. These membrane proteins are homologues to ABC-2 exporters. When evidence is minimal for association with an ABC-type ATP-hydrolyzing subunit, these porters are placed in category 2.A (secondary carriers; e.g., 2.A.88).

Canonical ABC importers play important roles in cell integrity, environmental stresses, cell-to-cell communication, cell differentiation and pathogenicity. An ABC sub-superfamily of micronutrient importers, the 'energy-coupling factor' (ECF) transporters, use ABC ATPases. Fundamental differences between tranditional ABC and ECF porters include the modular architecture and the independence of ECF systems of extracytoplasmic solute-binding proteins. Eitinger et al. (2011) review the roles of both types of transporters in diverse physiological processes including pathogenesis. They also point out the differences and similarities in modular assembly and their traits.

The uptake porters of the ABC superfamily and of the vitamin/small molecule transporters described by Rodionov et al., 2009 are homologous to the porters in the VUT family (2.A.88). In fact, our studies indicated that all uptake porters of the ABC superfamily are of the ABC2 type. When evidence suggests that homologous membrane transport proteins of the ABC2 type couple transport to ATP hydrolysis using a homologue of the ABC-type ATPases, we list these proteins in the ABC superfamily. If there is no such evidence, (e.g., experimental evidence and the occurrence of the gene for the membrane transporter protein is in an operon that lacks the ATPase and auxillary subunit) then the porter is placed into family 2.A.88.

Ter Beek et al. (2011) have determined the subunit stoichiometry and functional unit of the energy coupling factor (ECF)-type of ABC transporters (Rodionov et al., 2009). ECF transporters consist of a conserved energizing module (two peripheral ATPases and the integral membrane protein EcfT) and an integral membrane protein responsible for substrate specificity (S-component). S-components for different substrates  may associate with the same energizing module. The energizing module from Lactococcus lactis has been shown to form stable complexes with each of the eight predicted S-components found in this organism. Using light scattering, EcfT, the two ATPases (EcfA and EcfA'), and the S-component were found to be present in a stoichiometric 1:1:1:1 ratio. The complexes were reconstituted in proteoliposomes and shown to mediate ATP-dependent transport. ECF-type transporters are the smallest known ABC transporters.

Energy coupling factor (ECF) transporters are a subgroup of ATP-binding cassette (ABC) transporters involved in the uptake of vitamins and micronutrients in prokaryotes. In contrast to classical ABC importers, ECF transporters do not make use of water-soluble substrate binding proteins or domains but instead employ integral membrane proteins for substrate binding (S-components or EcfS). S-components form active translocation complexes with the ECF module, an assembly of two nucleotide-binding domains (NBDs, or EcfA) and a second transmembrane 'energy transducer' protein, EcfT. In many cases, the ECF module can interact with several different S-components that bind diverse substrates. The modular organization with exchangeable S-components on a single ECF module allows the transport of chemically different substrates via a common route. The determination of the crystal structures of the S-components that recognize thiamin and riboflavin provided clues about the mechanism of S-component exchange. Erkens et al. (2012) described current views of the transport mechanism by ECF transporters.

Some ABC exporters act on protein substrates. Export depends on the ABC transporter, a periplasmic 'adapter', the membrane fusion proteins (MFPs; 8.A.1) and an outer membrane factor (OMF; 1.B.17). Assembly of the tripartite complex can be transient and induced upon binding of the substrate to the ABC protein. Masi & Wandersman (2010) showed that in addition to the C-terminal targeting sequence, many additional signals throughout the substrate protein facilitate secretion. Interaction of the C-terminal 'targeting' signal activates the ATPase activity, causing disassembly of the complex. Thus, the proposed 'targeting' motif may signal dissociation rather than targeting (Masi & Wandersman et al., 2010). Dassa and Bouige (2001) have devised a phylogenetic/functional classification system for ABC transporters that overlaps the TC system. In their system, several of the TC families are included in single families. These reveal the closer phylogenetic relationship of TC families as follows:

Jones & George (2012) reported molecular dynamics simulations of the ATP/apo and ATP/ADP states of the bacterial ABC exporter Sav1866 (TC#3.A.1.106.2). Conformers of the active site have a canonical geometry for an in-line nucleophilic attack on the ATP γ-phosphate. The conserved glutamate immediately downstream of the Walker B motif is the catalytic base, forming a dyad with the H-loop histidine, while the Q-loop glutamine has an organising role. Each D-loop provides a coordinating residue of the attacking water, and comparison with the simulation of the ATP/ADP state suggested that via their flexibility, the D-loops modulate formation of the hydrolysis-competent state. A global switch involving a coupling helix delineates the signal transmission route by which allosteric control of ATP hydrolysis in ABC transporters is mediated.

Dassa and Bouige (2001) also provide the protein and domain organization of each of the various family-type proteins (see Table 1).

Table 1
D&B Family TC Families
Uptake
MOI SulT, + PhoT + MolT + FeT + POPT + ThiT
OTCN QAT + NitT + TauT
ISVH VB12 + FeCT
Export
DPL Lipid E + Glucan E + Prot1E + Prot2E + Pep1E + Pep2E + Pep3E + DrugE2 + DrugE3 + MDR + CFTR + Ste + TAP + HMT + MPE
OAD CT1 + CT2
EPD EPP + PDR
DRA DrugE1 + CPR
DRI NatE
CLS CPSE + LPSE + TAE

The generalized transport reaction for ABC-type uptake systems is:

Solute (out) + ATP → Solute (in) + ADP + Pi.

The generalized transport reaction for ABC-type efflux systems is:

Substrate (in) + ATP → Substrate (out) + ADP + Pi.

References associated with 3.A.1 family:

Świątek, M.A., J. Gubbens, G. Bucca, E. Song, Y.H. Yang, E. Laing, B.G. Kim, C.P. Smith, and G.P. van Wezel. (2013). The ROK family regulator Rok7B7 pleiotropically affects xylose utilization, carbon catabolite repression, and antibiotic production in streptomyces coelicolor. J. Bacteriol. 195: 1236-1248. 23292782
Abele, R. and R. Tampé. (1999). Function of the transport complex TAP in cellular immune recognition. Biochim. Biophys. Acta. 1461: 405-419. 10581370
Agarwal, S., D.W. Hunnicutt, and M.J. McBride. (1997). Cloning and characterization of the Flavobacterium johnsoniae (Cytophaga johnsonae) gliding motility gene, gldA. Proc. Natl. Acad. Sci. USA 94: 12139-12144. 9342376
Aguilar-Bryan, L. and J. Bryan. (1999). Molecular biology of adenosine triphosphate-sensitive potassium channels. Endocr Rev 20: 101-135. 10204114
Agustiandari, H., J. Lubelski, H.B. van den Berg van Saparoea, O.P. Kuipers, and A.J. Driessen. (2008). LmrR is a transcriptional repressor of expression of the multidrug ABC transporter LmrCD in Lactococcus lactis. J. Bacteriol. 190: 759-763. 17993533
Ahn, S., S. Moniot, M. Elias, E. Chabriere, D. Kim, and K. Scott. (2007). Structure-function relationships in a bacterial DING protein. FEBS Lett. 581: 3455-3460. 17612529
Akabas, M.H. (2000). Cystic fibrosis transmembrane conductance regulator. Structure and function of an epithelial chloride channel. J. Biol. Chem. 275: 3729-3732. 10660517
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