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Protein

Photosystem I P700 chlorophyll a apoprotein A1

Gene

psaA

Organism
Prochlorococcus marinus (strain AS9601)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Protein inferred from homologyi

Functioni

PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6.UniRule annotation

Catalytic activityi

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin.UniRule annotation

Cofactori

Note: PSI electron transfer chain: 5 divinyl chlorophyll a, 1 divinyl chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 divinyl chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. P700 is a divinyl chlorophyll a/divinyl chlorophyll a' dimer, A0 is one or more divinyl chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center.UniRule annotation

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi600 – 6001Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi609 – 6091Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi692 – 6921Magnesium (divinyl chlorophyll-a' A1 axial ligand; P700 special pair)UniRule annotation
Metal bindingi700 – 7001Magnesium (divinyl chlorophyll-a A3 axial ligand)UniRule annotation
Binding sitei708 – 7081Divinyl chlorophyll-a A3UniRule annotation
Binding sitei709 – 7091Phylloquinone AUniRule annotation

GO - Molecular functioni

  1. 4 iron, 4 sulfur cluster binding Source: UniProtKB-KW
  2. chlorophyll binding Source: UniProtKB-KW
  3. electron carrier activity Source: UniProtKB-HAMAP
  4. magnesium ion binding Source: UniProtKB-HAMAP
  5. oxidoreductase activity Source: UniProtKB-KW

GO - Biological processi

  1. photosynthesis Source: UniProtKB-HAMAP
  2. protein-chromophore linkage Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Electron transport, Photosynthesis, Transport

Keywords - Ligandi

4Fe-4S, Chlorophyll, Chromophore, Iron, Iron-sulfur, Magnesium, Metal-binding

Enzyme and pathway databases

BioCyciPMAR146891:GH90-1760-MONOMER.

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A1UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PsaAUniRule annotation
Gene namesi
Name:psaAUniRule annotation
Ordered Locus Names:A9601_17281
OrganismiProchlorococcus marinus (strain AS9601)
Taxonomic identifieri146891 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000002590 Componenti: Chromosome

Subcellular locationi

Cellular thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei76 – 9924Helical; Name=IUniRule annotationAdd
BLAST
Transmembranei162 – 18524Helical; Name=IIUniRule annotationAdd
BLAST
Transmembranei201 – 22525Helical; Name=IIIUniRule annotationAdd
BLAST
Transmembranei309 – 32719Helical; Name=IVUniRule annotationAdd
BLAST
Transmembranei368 – 39124Helical; Name=VUniRule annotationAdd
BLAST
Transmembranei407 – 43327Helical; Name=VIUniRule annotationAdd
BLAST
Transmembranei455 – 47723Helical; Name=VIIUniRule annotationAdd
BLAST
Transmembranei558 – 57619Helical; Name=VIIIUniRule annotationAdd
BLAST
Transmembranei616 – 63722Helical; Name=IXUniRule annotationAdd
BLAST
Transmembranei681 – 70323Helical; Name=XUniRule annotationAdd
BLAST
Transmembranei741 – 76121Helical; Name=XIUniRule annotationAdd
BLAST

GO - Cellular componenti

  1. integral component of membrane Source: UniProtKB-KW
  2. photosystem I Source: UniProtKB-KW
  3. thylakoid membrane Source: UniProtKB-SubCell
Complete GO annotation...

Keywords - Cellular componenti

Membrane, Photosystem I, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 767767Photosystem I P700 chlorophyll a apoprotein A1PRO_0000294199Add
BLAST

Interactioni

Subunit structurei

The PsaA/B heterodimer binds the P700 divinyl chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.UniRule annotation

Protein-protein interaction databases

STRINGi146891.A9601_17281.

Structurei

3D structure databases

ProteinModelPortaliA2BTA0.
SMRiA2BTA0. Positions 20-767.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG05023.
HOGENOMiHOG000276868.
KOiK02689.
OMAiTWAFFHA.
OrthoDBiEOG60W7PS.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA.
InterProiIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01335. psaA. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A2BTA0-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTISPPESGE KNKKVLEDPV KADPRPIDFA KLDKPGFWSS KLSKGPKTTT
60 70 80 90 100
WIWNLHADAH DFDVHTGDAE EATRKIFSAH FGHLAVIFIW MSAAFFHGAR
110 120 130 140 150
FSNYSGWLAD PTHVKPGAQQ VWAIVGQEML NADLGANYNG IQISSGIFHM
160 170 180 190 200
WRAWGITNES ELMALAIGAV VMAALMLHAG IFHYHKAAPK MEWFQDIESM
210 220 230 240 250
LNHHIAGLVG LGSLAWAGHC IHIGAPTAAL LDAIDAGSPL VINGKEIATI
260 270 280 290 300
ADMPMPHQLC DPQIIGQIFP GLASGTGNFF SLNWLAFSDF LTFKGGLNPV
310 320 330 340 350
TGSLWMTDVS HHHLAFGVIA IIGGHMYRTN YGIGHSMKEI LDSQQGDPIL
360 370 380 390 400
FPAPKGHQGL FEFMAESRHA QLSVNLAMLG SISILVSHHM YAMPPYPYIA
410 420 430 440 450
TDYMTVLGLF THHMWIGGLF IVGAGAHAGI AMVRDYDPAK HIDNVLDRIL
460 470 480 490 500
KARDALISHL NWVCMWLGFH SFGLYIHNDT MRALGRPQDM FSDSAIQLQP
510 520 530 540 550
IFAQWVQSIQ ASAVGTFLLA GTSEALPHKA LSEVFNGSLV EVGGKVAIAP
560 570 580 590 600
IPLGTADLMI HHIHAFQIHV TVLILLKGVL YARSSRLIPD KASLGFRFPC
610 620 630 640 650
DGPGRGGTCQ VSSWDHVFLA LFWMYNCLSI VIFHFSWKMQ SDVWGLTGGN
660 670 680 690 700
FAQSSITING WLRDFLWAQA SQVLTSYGQS ISMYGLMFLG AHFIWAFSLM
710 720 730 740 750
FLFSGRGYWQ ELFESIVWAH NKLKVAPTIQ PRALSITQGR AVGVTHFLVG
760
GIATTWAFFH ARLFGLG
Length:767
Mass (Da):84,373
Last modified:February 19, 2007 - v1
Checksum:i4C8C1A669AAF75E2
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000551 Genomic DNA. Translation: ABM71011.1.
RefSeqiYP_001010118.1. NC_008816.1.

Genome annotation databases

EnsemblBacteriaiABM71011; ABM71011; A9601_17281.
KEGGipmb:A9601_17281.
PATRICi22984991. VBIProMar75723_1738.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000551 Genomic DNA. Translation: ABM71011.1.
RefSeqiYP_001010118.1. NC_008816.1.

3D structure databases

ProteinModelPortaliA2BTA0.
SMRiA2BTA0. Positions 20-767.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi146891.A9601_17281.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiABM71011; ABM71011; A9601_17281.
KEGGipmb:A9601_17281.
PATRICi22984991. VBIProMar75723_1738.

Phylogenomic databases

eggNOGiNOG05023.
HOGENOMiHOG000276868.
KOiK02689.
OMAiTWAFFHA.
OrthoDBiEOG60W7PS.

Enzyme and pathway databases

BioCyciPMAR146891:GH90-1760-MONOMER.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA.
InterProiIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01335. psaA. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetiSearch...

Publicationsi

  1. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: AS9601.

Entry informationi

Entry nameiPSAA_PROMS
AccessioniPrimary (citable) accession number: A2BTA0
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 9, 2007
Last sequence update: February 19, 2007
Last modified: March 31, 2015
This is version 60 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into Uniref entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.