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Reviewed, UniProtKB/Swiss-Prot Q16720 (AT2B3_HUMAN)

Last modified July 22, 2008. Version 83. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (6) | Third-party data | Customize display text xml rdf/xml gff fasta
Names and origin · Protein attributes · General annotation (Comments) · Ontologies · Alternative products · Sequence annotation (Features) · Sequences · References · Cross-references · Entry information · Relevant documents

Names and origin

Protein namesRecommended name:
    Plasma membrane calcium-transporting ATPase 3
      Short name=PMCA3
    EC=3.6.3.8
Alternative name(s):
    Plasma membrane calcium ATPase isoform 3
    Plasma membrane calcium pump isoform 3
Gene names
Name: ATP2B3
OrganismHomo sapiens (Human)
Taxonomic identifier9606 [NCBI]
Taxonomic lineageEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo

Protein attributes

Sequence length1220 AA.
Sequence statusComplete.
Sequence processingThe displayed sequence is not processed.
Protein existenceEvidence at protein level.

General annotation (Comments)

Function

This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the transport of calcium out of the cell.

Catalytic activity

ATP + H(2)O + Ca(2+)(Cis) = ADP + phosphate + Ca(2+)(Trans).

Subcellular location

Cell membrane; Multi-pass membrane protein.

Tissue specificity

Isoforms XE and XB are the most abundant isoforms and are detected at low levels in brain and fetal skeletal muscle. The other isoforms are only found at lower levels and not in fetal tissues.

Sequence similarities

Belongs to the cation transport ATPase (P-type) family. Type IIB subfamily.

Ontologies

Keywords

   Biological processCalcium transport
Ion transport
Transport
   Cellular componentCell membrane
Membrane
   Coding sequence diversityAlternative splicing
Polymorphism
   DomainTransmembrane
   LigandATP-binding
Calcium
Calmodulin-binding
Magnesium
Metal-binding
Nucleotide-binding
   Molecular functionHydrolase
   PTMPhosphoprotein

Gene Ontology (GO)

   Biological processtransport Ref.1

Traceable author statement. Source: ProtInc

   Cellular componentplasma membrane Ref.1

Traceable author statement. Source: ProtInc

   Molecular functioncalcium-transporting ATPase activity Ref.1

Traceable author statement. Source: ProtInc

Complete GO annotation...

Alternative products

This entry describes 8 isoforms produced by alternative splicing. [Align] [Select]

Notes: There is a combination of two alternatively spliced domains at N-terminal site A (X and Z) and at C-terminal site C (A, B, E and G). The splice sites have mostly been studied independently. Full isoforms so far detected are isoform XA and isoform XB. Experimental confirmation may be lacking for some isoforms.
Isoform XB (identifier: Q16720-1)

Also known as: AIICI;

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.
Isoform XA (identifier: Q16720-2)

Also known as: AIICII;

The sequence of this isoform differs from the canonical sequence as follows:
     1115-1220: IRVVKAFRSS...SPLHSVETSL → MEVVSTFKRS...AGNPGGESVP
Isoform ZA (identifier: Q16720-3)

Also known as: AICII;

The sequence of this isoform differs from the canonical sequence as follows:
     306-319: Missing.
     1115-1220: IRVVKAFRSS...SPLHSVETSL → MEVVSTFKRS...AGNPGGESVP
Isoform ZB (identifier: Q16720-4)

Also known as: AICI;

The sequence of this isoform differs from the canonical sequence as follows:
     306-319: Missing.
Isoform XE (identifier: Q16720-5)

Also known as: AIICV;

The sequence of this isoform differs from the canonical sequence as follows:
     1115-1220: IRVVKAFRSS...SPLHSVETSL → MEVVSTFKRS...NPTSAAGSES
Isoform ZE (identifier: Q16720-6)

Also known as: AICV;

The sequence of this isoform differs from the canonical sequence as follows:
     306-319: Missing.
     1115-1220: IRVVKAFRSS...SPLHSVETSL → MEVVSTFKRS...NPTSAAGSES
Isoform XG (identifier: Q16720-7)

Also known as: AIICVII;

The sequence of this isoform differs from the canonical sequence as follows:
     1115-1220: IRVVKAFRSS...SPLHSVETSL → VCWDGKKMLRTTEVG
Isoform ZG (identifier: Q16720-8)

Also known as: AICVII;

The sequence of this isoform differs from the canonical sequence as follows:
     306-319: Missing.
     1115-1220: IRVVKAFRSS...SPLHSVETSL → VCWDGKKMLRTTEVG

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical view

Molecule processing

Chain1 – 12201220Plasma membrane calcium-transporting ATPase 3

Regions

Topological domain1 – 9797Cytoplasmic Potential
Transmembrane98 – 11821 Potential
Topological domain119 – 15537Extracellular Potential
Transmembrane156 – 17621 Potential
Topological domain177 – 364188Cytoplasmic Potential
Transmembrane365 – 38420 Potential
Topological domain385 – 41733Extracellular Potential
Transmembrane418 – 43518 Potential
Topological domain436 – 849414Cytoplasmic Potential
Transmembrane850 – 86920 Potential
Topological domain870 – 87910Extracellular Potential
Transmembrane880 – 90021 Potential
Topological domain901 – 92020Cytoplasmic Potential
Transmembrane921 – 94323 Potential
Topological domain944 – 96118Extracellular Potential
Transmembrane962 – 98322 Potential
Topological domain984 – 100219Cytoplasmic Potential
Transmembrane1003 – 102422 Potential
Topological domain1025 – 103410Extracellular Potential
Transmembrane1035 – 105622 Potential
Topological domain1057 – 1220164Cytoplasmic Potential
Region1097 – 111418Calmodulin-binding subdomain A By similarity
Region1115 – 112410Calmodulin-binding subdomain B By similarity
Compositional bias297 – 3004Poly-Glu
Compositional bias1174 – 11796Poly-Pro

Sites

Active site47314-aspartylphosphate intermediate By similarity
Metal binding7941Magnesium By similarity
Metal binding7981Magnesium By similarity

Amino acid modifications

Modified residue11131Phosphothreonine; by PKC By similarity

Natural variations

Alternative sequence306 – 31914Missing in isoform ZA, isoform ZB, isoform ZE and isoform ZG.
Alternative sequence1115 – 1220106IRVVK…VETSL → MEVVSTFKRSGSVQGAVRRR SSVLSQLHDVTNLSTPTHAI LSAANPTSAAGNPGGESVP in isoform XA and isoform ZA.
Alternative sequence1115 – 1220106IRVVK…VETSL → MEVVSTFKRSGSVQGAVRRR SSVLSQLHDVTNLSTPTHAI LSAANPTSAAGSES in isoform XE and isoform ZE.
Alternative sequence1115 – 1220106IRVVK…VETSL → VCWDGKKMLRTTEVG in isoform XG and isoform ZG.
Natural variant1981I → M: dbSNP rs2269409.

Experimental info

Sequence conflict5871I → V in AAB09762 and AAB38530. Ref.1
Sequence conflict6541S → Y in AAB09762 and AAB38530. Ref.1

Sequences

Sequence LengthMass (Da)Tools
Isoform XB (AIICI) [UniParc].

Last modified October 17, 2006. Version 3.
Checksum: 03B2BA8A0A33B193

FASTA1,220134,197
        10         20         30         40         50         60 
MGDMANSSIE FHPKPQQQRD VPQAGGFGCT LAELRTLMEL RGAEALQKIE EAYGDVSGLC 

        70         80         90        100        110        120 
RRLKTSPTEG LADNTNDLEK RRQIYGQNFI PPKQPKTFLQ LVWEALQDVT LIILEVAAIV 

       130        140        150        160        170        180 
SLGLSFYAPP GEESEACGNV SGGAEDEGEA EAGWIEGAAI LLSVICVVLV TAFNDWSKEK 

       190        200        210        220        230        240 
QFRGLQSRIE QEQKFTVIRN GQLLQVPVAA LVVGDIAQVK YGDLLPADGV LIQANDLKID 

       250        260        270        280        290        300 
ESSLTGESDH VRKSADKDPM LLSGTHVMEG SGRMVVTAVG VNSQTGIIFT LLGAGGEEEE 

       310        320        330        340        350        360 
KKDKKGKQQD GAMESSQTKA KKQDGAVAME MQPLKSAEGG EMEEREKKKA NAPKKEKSVL 

       370        380        390        400        410        420 
QGKLTKLAVQ IGKAGLVMSA ITVIILVLYF VIETFVVEGR TWLAECTPVY VQYFVKFFII 

       430        440        450        460        470        480 
GVTVLVVAVP EGLPLAVTIS LAYSVKKMMK DNNLVRHLDA CETMGNATAI CSDKTGTLTT 

       490        500        510        520        530        540 
NRMTVVQSYL GDTHYKEIPA PSALTPKILD LLVHAISINS AYTTKILPPE KEGALPRQVG 

       550        560        570        580        590        600 
NKTECALLGF VLDLKRDFQP VREQIPEDKL YKVYTFNSVR KSMSTVIRMP DGGFRLFSKG 

       610        620        630        640        650        660 
ASEILLKKCT NILNSNGELR GFRPRDRDDM VRKIIEPMAC DGLRTICIAY RDFSAGQEPD 

       670        680        690        700        710        720 
WDNENEVVGD LTCIAVVGIE DPVRPEVPEA IRKCQRAGIT VRMVTGDNIN TARAIAAKCG 

       730        740        750        760        770        780 
IIQPGEDFLC LEGKEFNRRI RNEKGEIEQE RLDKVWPKLR VLARSSPTDK HTLVKGIIDS 

       790        800        810        820        830        840 
TTGEQRQVVA VTGDGTNDGP ALKKADVGFA MGIAGTDVAK EASDIILTDD NFTSIVKAVM 

       850        860        870        880        890        900 
WGRNVYDSIS KFLQFQLTVN VVAVIVAFTG ACITQDSPLK AVQMLWVNLI MDTFASLALA 

       910        920        930        940        950        960 
TEPPTESLLL RKPYGRDKPL ISRTMMKNIL GHAVYQLAII FTLLFVGELF FDIDSGRNAP 

       970        980        990       1000       1010       1020 
LHSPPSEHYT IIFNTFVMMQ LFNEINARKI HGERNVFDGI FSNPIFCTIV LGTFGIQIVI 

      1030       1040       1050       1060       1070       1080 
VQFGGKPFSC SPLSTEQWLW CLFVGVGELV WGQVIATIPT SQLKCLKEAG HGPGKDEMTD 

      1090       1100       1110       1120       1130       1140 
EELAEGEEEI DHAERELRRG QILWFRGLNR IQTQIRVVKA FRSSLYEGLE KPESKTSIHN 

      1150       1160       1170       1180       1190       1200 
FMATPEFLIN DYTHNIPLID DTDVDENEER LRAPPPPSPN QNNNAIDSGI YLTTHVTKSA 

      1210       1220 
TSSVFSSSPG SPLHSVETSL 

« Hide

Isoform XA (AIICII) [UniParc].

Checksum: EF3ACDF02DF40B8C
Show »

1,173128,545
Isoform ZA (AICII) [UniParc].

Checksum: D092487DFC13E8A3
Show »

1,159127,068
Isoform ZB (AICI) [UniParc].

Checksum: 2366490D5E398C08
Show »

1,206132,721
Isoform XE (AIICV) [UniParc].

Checksum: 79D7ED01B8F1BA88
Show »

1,168128,110
Isoform ZE (AICV) [UniParc].

Checksum: 6E34C22E92BEAE95
Show »

1,154126,634
Isoform XG (AIICVII) [UniParc].

Checksum: 17805052F1230AEF
Show »

1,129124,236
Isoform ZG (AICVII) [UniParc].

Checksum: 46F7F01999CFA318
Show »

1,115122,760

References

[1]"Primary structure of human plasma membrane Ca(2+)-ATPase isoform 3."
Brown B., Hilfiker H., Demarco S.J., Zacharias D.A., Greenwood T.M., Carafoli E., Strehler E.E.
Biochim. Biophys. Acta 1283:10-13(1996) [PubMed: 8765088] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS XA AND XB).
Tissue: Brain.
[2]"Localization of two genes encoding plasma membrane Ca2+ ATPases isoforms 2 (ATP2B2) and 3 (ATP2B3) to human chromosomes 3p26-->p25 and Xq28, respectively."
Wang M.G., Yi H., Hilfiker H., Carafoli E., Strehler E.E., McBride O.W.
Cytogenet. Cell Genet. 67:41-45(1994) [PubMed: 8187550] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-319 (ISOFORM X).
[3]"Comparative genome sequence analysis of the Bpa/Str region in mouse and man."
Mallon A.-M., Platzer M., Bate R., Gloeckner G., Botcherby M.R.M., Nordsiek G., Strivens M.A., Kioschis P., Dangel A., Cunningham D., Straw R.N.A., Weston P., Gilbert M., Fernando S., Goodall K., Hunter G., Greystrong J.S., Clarke D. expand/collapse author list , Kimberley C., Goerdes M., Blechschmidt K., Rump A., Hinzmann B., Mundy C.R., Miller W., Poustka A., Herman G.E., Rhodes M., Denny P.,