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4.A.3.1.1
Lactose (Lac) porter, LacEF (Kowolik and Hengstenberg 1998).  This system is 87% identical to the LacEF ortholog in Streptococcus mutans (Rosey and Stewart 1992).

Accession Number:P0A0D6
Protein Name:PtlA aka LACF
Length:103
Molecular Weight:11370.00
Species:Staphylococcus aureus [1280]
Location1 / Topology2 / Orientation3: Cytoplasm1
Substrate alpha-lactose

Cross database links:

Pfam: PF02255   

Gene Ontology

GO:0005737 C:cytoplasm
GO:0016020 C:membrane
GO:0046872 F:metal ion binding
GO:0005351 F:sugar:hydrogen symporter activity
GO:0016740 F:transferase activity
GO:0009401 P:phosphoenolpyruvate-dependent sugar phospho...

References (5)

[1] “Identification of the genes for the lactose-specific components of the phosphotransferase system in the lac operon of Staphylococcus aureus.”  Breidt F. Jr.et.al.   2824493
[2] “Amino acid sequence of the amphiphilic phosphocarrier protein factor IIILac of the lactose-specific phosphotransferase system of Staphylococcus.”  Stuber K.et.al.   4096897
[3] “Phosphoenolpyruvate-dependent phosphotransferase system of Staphylococcus aureus: 1H nuclear magnetic resonance studies on phosphorylated and unphosphorylated factor IIIlac and its interaction with the phosphocarrier protein HPr.”  Kalbitzer H.R.et.al.   7306504
[4] “Phosphoenolpyruvate-dependent phosphotransferase system of Staphylococcus aureus: factor IIIlac, a trimeric phospho-carrier protein that also acts as a phase transfer catalyst.”  Deutscher J.et.al.   7138836
[5] “Enzyme IIIlac of the staphylococcal phosphoenolpyruvate-dependent phosphotransferase system: site-specific mutagenesis of histidine residues, biochemical characterization and 1H-NMR studies.”  Finkeldei U.et.al.   1881873

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MNREEVQLLG FEIVAFAGDA RSKFLEALTA AQAGDFAKAD ALIEEGNNCI AEAHRAQTSL 
61:	LAKEAQGDDI AYSVTMMHGQ DHLMTTILLK DLMKHLLEFY KRG