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A2CC72

- PSAB_PROM3

UniProt

A2CC72 - PSAB_PROM3

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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene
psaB, P9303_23471
Organism
Prochlorococcus marinus (strain MIT 9303)
Status
Reviewed - 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 By similarity.UniRule annotation

Catalytic activityi

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

Cofactori

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 By similarity.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi574 – 5741Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi583 – 5831Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi669 – 6691Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal bindingi677 – 6771Magnesium (divinyl chlorophyll-a B3 axial ligand) By similarity
Binding sitei685 – 6851Divinyl chlorophyll-a B3 By similarity
Binding sitei686 – 6861Phylloquinone B By similarity

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

BioCyciPMAR59922:GH54-2455-MONOMER.

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2 (EC:1.97.1.12)
Alternative name(s):
PsaB
Gene namesi
Name:psaB
Ordered Locus Names:P9303_23471
OrganismiProchlorococcus marinus (strain MIT 9303)
Taxonomic identifieri59922 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000002274: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei46 – 6924Helical; Name=I; Reviewed predictionAdd
BLAST
Transmembranei135 – 15824Helical; Name=II; Reviewed predictionAdd
BLAST
Transmembranei175 – 19925Helical; Name=III; Reviewed predictionAdd
BLAST
Transmembranei273 – 29119Helical; Name=IV; Reviewed predictionAdd
BLAST
Transmembranei343 – 36624Helical; Name=V; Reviewed predictionAdd
BLAST
Transmembranei382 – 40827Helical; Name=VI; Reviewed predictionAdd
BLAST
Transmembranei430 – 45223Helical; Name=VII; Reviewed predictionAdd
BLAST
Transmembranei532 – 55019Helical; Name=VIII; Reviewed predictionAdd
BLAST
Transmembranei590 – 61122Helical; Name=IX; Reviewed predictionAdd
BLAST
Transmembranei658 – 68023Helical; Name=X; Reviewed predictionAdd
BLAST
Transmembranei722 – 74221Helical; Name=XI; Reviewed predictionAdd
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 – 749749Photosystem I P700 chlorophyll a apoprotein A2UniRule annotationPRO_0000300018Add
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 By similarity.

Protein-protein interaction databases

STRINGi59922.P9303_23471.

Structurei

3D structure databases

ProteinModelPortaliA2CC72.
SMRiA2CC72. Positions 2-748.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG04867.
HOGENOMiHOG000276868.
KOiK02690.
OMAiAQFNESS.
OrthoDBiEOG60W7PS.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00482. PSI_PsaB.
InterProiIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01336. psaB. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A2CC72-1 [UniParc]FASTAAdd to Basket

« Hide

MATKFPSFSQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE RLYQKLFSTH    50
FGHLAVIGLW VAGNLFHIAW QGNFEQWVAD PQNVQPIAHA IWDPHFGQGI 100
SDALTQAGAS RPVNICYSGL YHWWYTIGMR TNTELYQGAI FIDILVAWLL 150
FGGWLHLQPK FRPSLAWFKN AEAMMNHHLA VLFGFTNIAW TGHLVHVAIP 200
ESRGQHVGWD NFLTVLPHPE GLTPFFTGNW GAYAQNPDSL NHAFGTSEGA 250
GTAILTFLGG VHPQSGALWL TDISHHHIAI GVFMIIGGHM YRNSFGIGHT 300
FKEITDGHNT SHPNDPHKDG FREKIGHYGL SHTGITDTIN NSLHFQLGLA 350
LACLGTAASL VAHHMGALPS YAFIAQDYTT QAALYTHHQY IAIFLMCGAF 400
SHGAIFFVRD YDPEANKDNV LARVLETKEA LISHLSWVCM LLGFHTLALY 450
LHNDVVIAFG TPEKQILVEP IFAQFIQAAS GKVMYGLDVL LANANSAPSL 500
AAAGMPGDHY WMDLINASPE VSNFMPIGPG DFLVHHGIAL GLHTTALILI 550
KGALDARGSK LMPDKKDFGY AFACDGPGRG GTCDISAWDS TYMAIFWALN 600
TIAWATYYWH WKHLAAWQGN MAQFNESSTH LMGWFRDYLW INSSQIINGY 650
NPFGINNLSP WAYMFLAGHL VWATGFMFLI SWRGYWQELI ETLVWAHQRS 700
PIANLVGWRD KPVALSIVQA RLVGVTHFAV GNIFTFGAFV IASTASKFG 749
Length:749
Mass (Da):83,151
Last modified:February 20, 2007 - v1
Checksum:i6C0AE61033501E0C
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000554 Genomic DNA. Translation: ABM79082.1.
RefSeqiYP_001018347.1. NC_008820.1.

Genome annotation databases

EnsemblBacteriaiABM79082; ABM79082; P9303_23471.
GeneIDi4778124.
KEGGipmf:P9303_23471.
PATRICi23002255. VBIProMar17757_2418.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000554 Genomic DNA. Translation: ABM79082.1 .
RefSeqi YP_001018347.1. NC_008820.1.

3D structure databases

ProteinModelPortali A2CC72.
SMRi A2CC72. Positions 2-748.
ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

STRINGi 59922.P9303_23471.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai ABM79082 ; ABM79082 ; P9303_23471 .
GeneIDi 4778124.
KEGGi pmf:P9303_23471.
PATRICi 23002255. VBIProMar17757_2418.

Phylogenomic databases

eggNOGi NOG04867.
HOGENOMi HOG000276868.
KOi K02690.
OMAi AQFNESS.
OrthoDBi EOG60W7PS.

Enzyme and pathway databases

BioCyci PMAR59922:GH54-2455-MONOMER.

Family and domain databases

Gene3Di 1.20.1130.10. 1 hit.
HAMAPi MF_00482. PSI_PsaB.
InterProi IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view ]
Pfami PF00223. PsaA_PsaB. 1 hit.
[Graphical view ]
PIRSFi PIRSF002905. PSI_A. 1 hit.
PRINTSi PR00257. PHOTSYSPSAAB.
SUPFAMi SSF81558. SSF81558. 1 hit.
TIGRFAMsi TIGR01336. psaB. 1 hit.
PROSITEi PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

  1. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: MIT 9303.

Entry informationi

Entry nameiPSAB_PROM3
AccessioniPrimary (citable) accession number: A2CC72
Entry historyi
Integrated into UniProtKB/Swiss-Prot: September 11, 2007
Last sequence update: February 20, 2007
Last modified: May 14, 2014
This is version 55 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

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