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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

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 bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi576 – 5761Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi662 – 6621Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation
Metal bindingi670 – 6701Magnesium (divinyl chlorophyll-a B3 axial ligand)UniRule annotation
Binding sitei678 – 6781Divinyl chlorophyll-a B3UniRule annotation
Binding sitei679 – 6791Phylloquinone BUniRule annotation

GO - Molecular functioni

GO - Biological processi

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:GH90-1759-MONOMER.

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PsaBUniRule annotation
Gene namesi
Name:psaBUniRule annotation
Ordered Locus Names:A9601_17271
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
Transmembranei46 – 6924Helical; Name=IUniRule annotationAdd
BLAST
Transmembranei135 – 15824Helical; Name=IIUniRule annotationAdd
BLAST
Transmembranei175 – 19925Helical; Name=IIIUniRule annotationAdd
BLAST
Transmembranei273 – 29119Helical; Name=IVUniRule annotationAdd
BLAST
Transmembranei336 – 35924Helical; Name=VUniRule annotationAdd
BLAST
Transmembranei375 – 40127Helical; Name=VIUniRule annotationAdd
BLAST
Transmembranei423 – 44523Helical; Name=VIIUniRule annotationAdd
BLAST
Transmembranei525 – 54319Helical; Name=VIIIUniRule annotationAdd
BLAST
Transmembranei583 – 60422Helical; Name=IXUniRule annotationAdd
BLAST
Transmembranei651 – 67323Helical; Name=XUniRule annotationAdd
BLAST
Transmembranei715 – 73521Helical; Name=XIUniRule annotationAdd
BLAST

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Membrane, Photosystem I, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 742742Photosystem I P700 chlorophyll a apoprotein A2PRO_0000300016Add
BLAST

Proteomic databases

PRIDEiA2BT99.

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_17271.

Structurei

3D structure databases

ProteinModelPortaliA2BT99.
SMRiA2BT99. Positions 2-741.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

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.

A2BT99-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MATKFPSFNQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE KLYQKLFSTH
60 70 80 90 100
FGHLAIIALW VAGNLFHIAW QGNFEQFVLD PTHVRPIAHA IWDPHFGSGI
110 120 130 140 150
TEAMTQAGAS GPVNIAYSGL YHWWYTIGMR TNEQLFQASI FMSILACWTL
160 170 180 190 200
FAGWLHLQPK FRPSLAWFKN AESRLNHHLA VLFGFSSIAW TGHLVHVAIP
210 220 230 240 250
ESRGQHVGWD NWLTVLPHPA GLAPFFTLNW GAYAQNPDSL DQVFGTAEGA
260 270 280 290 300
GTAIFTFLGG LHPQSEALWL TDIAHHHIAI GTVFVIAGHM YRNTFGIGHS
310 320 330 340 350
LKEITEAHNT RHPNDPHKGS FGINHDGIYE TVNNSLHFQL GLALASLGVA
360 370 380 390 400
TSLVAQHMGA LPSYAFIARD YTTQSALYSH HQYIAMFLMV GAFAHGAIFF
410 420 430 440 450
VRDYDPELNK DNVLARVLGT KEALISHLSW VTMLLGFHTL GIYVHNDVVV
460 470 480 490 500
AFGNPEKQIL IEPVFAQFVQ AAQGKMMYGF NALLSDPTSS ASLAANSLPG
510 520 530 540 550
NHYWMDLINR QDALSAFLPI GPADFLVHHA IALGLHTTAL ILIKGALDAR
560 570 580 590 600
GTKLIPDKKD LGYAFPCDGP GRGGTCDSSS WDAMYLAMFW ALNLLAWVTF
610 620 630 640 650
YWHWKHLAIW QGNVAQFNES GTYLMGWFRD YLWLNSAQLI NGYNPFGVNS
660 670 680 690 700
LSPWAWMFLF GHLVWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG
710 720 730 740
WRDKPVALSI VQARLVGLAH FTIGNILTFG AFVIASTSGK FG
Length:742
Mass (Da):82,671
Last modified:February 20, 2007 - v1
Checksum:iB1F9B1238E39D3F0
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000551 Genomic DNA. Translation: ABM71010.1.
RefSeqiWP_011819135.1. NC_008816.1.
YP_001010117.1. NC_008816.1.

Genome annotation databases

EnsemblBacteriaiABM71010; ABM71010; A9601_17271.
GeneIDi4912401.
KEGGipmb:A9601_17271.
PATRICi22984989. VBIProMar75723_1737.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000551 Genomic DNA. Translation: ABM71010.1.
RefSeqiWP_011819135.1. NC_008816.1.
YP_001010117.1. NC_008816.1.

3D structure databases

ProteinModelPortaliA2BT99.
SMRiA2BT99. Positions 2-741.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi146891.A9601_17271.

Proteomic databases

PRIDEiA2BT99.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiABM71010; ABM71010; A9601_17271.
GeneIDi4912401.
KEGGipmb:A9601_17271.
PATRICi22984989. VBIProMar75723_1737.

Phylogenomic databases

eggNOGiNOG04867.
HOGENOMiHOG000276868.
KOiK02690.
OMAiAQFNESS.
OrthoDBiEOG60W7PS.

Enzyme and pathway databases

BioCyciPMAR146891:GH90-1759-MONOMER.

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]
ProtoNetiSearch...

Publicationsi

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

Entry informationi

Entry nameiPSAB_PROMS
AccessioniPrimary (citable) accession number: A2BT99
Entry historyi
Integrated into UniProtKB/Swiss-Prot: September 11, 2007
Last sequence update: February 20, 2007
Last modified: May 27, 2015
This is version 63 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.