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2.A.19.2.2
Vacuolar [Mn2+ or Ca2+]:H+ antiporter, Hum1 (Mn2+ resistance (Mnr1)) protein. Vcx1 has 11 probable TMSs with the N-terminus inside (Segarra and Thomas, 2008).  The 3-d structure has been determined at 2.3 Å resolution for the cytosolic facing, substrate bound form, favoring the alternating access mechanism of transport (Waight et al. 2013).

Accession Number:Q99385
Protein Name:Hum1 aka Mnr1 aka VCX1 aka YDL128W
Length:411
Molecular Weight:44646.00
Species:Saccharomyces cerevisiae (Baker's yeast) [4932]
Number of TMSs:11
Location1 / Topology2 / Orientation3: Vacuole membrane1 / Multi-pass membrane protein2
Substrate calcium(2+), hydron, manganese(2+)

Cross database links:

DIP: DIP-5039N
RefSeq: NP_010155.1   
Entrez Gene ID: 851429   
Pfam: PF01699   
KEGG: sce:YDL128W   

Gene Ontology

GO:0000324 C:fungal-type vacuole
GO:0016021 C:integral to membrane
GO:0005774 C:vacuolar membrane
GO:0015085 F:calcium ion transmembrane transporter activity
GO:0046872 F:metal ion binding
GO:0005515 F:protein binding
GO:0006816 P:calcium ion transport
GO:0006874 P:cellular calcium ion homeostasis
GO:0055085 P:transmembrane transport

References (7)

[1] “The product of HUM1, a novel yeast gene, is required for vacuolar Ca2+/H+ exchange and is related to mammalian Na+/Ca2+ exchangers.”  Pozos T.C.et.al.   8668190
[2] “Calcineurin inhibits VCX1-dependent H+/Ca2+ exchange and induces Ca2+ ATPases in Saccharomyces cerevisiae.”  Cunningham K.W.et.al.   8628289
[3] “A single nucleotide change in the MNR1 (VCX1/HUM1) gene determines resistance to Manganese in Saccharomyces cerevisae.”  Del Pozo L.et.al.   10219995
[4] “The nucleotide sequence of Saccharomyces cerevisiae chromosome IV.”  Jacq C.et.al.   9169867
[5] “Global analysis of protein expression in yeast.”  Ghaemmaghami S.et.al.   14562106
[6] “Quantitative phosphoproteomics applied to the yeast pheromone signaling pathway.”  Gruhler A.et.al.   15665377
[7] “A global topology map of the Saccharomyces cerevisiae membrane proteome.”  Kim H.et.al.   16847258
Structure:
4K1C     

External Searches:

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MDATTPLLTV ANSHPARNPK HTAWRAAVYD LQYILKASPL NFLLVFVPLG LIWGHFQLSH 
61:	TLTFLFNFLA IIPLAAILAN ATEELADKAG NTIGGLLNAT FGNAVELIVS IIALKKGQVR 
121:	IVQASMLGSL LSNLLLVLGL CFIFGGYNRV QQTFNQTAAQ TMSSLLAIAC ASLLIPAAFR 
181:	ATLPHGKEDH FIDGKILELS RGTSIVILIV YVLFLYFQLG SHHALFEQQE EETDEVMSTI 
241:	SRNPHHSLSV KSSLVILLGT TVIISFCADF LVGTIDNVVE STGLSKTFIG LIVIPIVGNA 
301:	AEHVTSVLVA MKDKMDLALG VAIGSSLQVA LFVTPFMVLV GWMIDVPMTL NFSTFETATL 
361:	FIAVFLSNYL ILDGESNWLE GVMSLAMYIL IAMAFFYYPD EKTLDSIGNS L