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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Phaeodactylum tricornutum (strain CCAP 1055/1)
Status
Reviewed-Annotation score: Annotation score: 4 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: P700 is a chlorophyll a/chlorophyll a' dimer, A0 is one or more chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi558Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi567Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi653Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation1
Metal bindingi661Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation1
Binding sitei669Chlorophyll-a B3UniRule annotation1
Binding sitei670Phylloquinone BUniRule annotation1

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

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PSI-BUniRule annotation
PsaBUniRule annotation
Gene namesi
Name:psaBUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiPhaeodactylum tricornutum (strain CCAP 1055/1)
Taxonomic identifieri556484 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaBacillariophyceaeBacillariophycidaeNaviculalesPhaeodactylaceaePhaeodactylum
Proteomesi
  • UP000000759 Componenti: Chloroplast

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei46 – 69Helical; Name=IUniRule annotationAdd BLAST24
Transmembranei134 – 157Helical; Name=IIUniRule annotationAdd BLAST24
Transmembranei174 – 198Helical; Name=IIIUniRule annotationAdd BLAST25
Transmembranei272 – 290Helical; Name=IVUniRule annotationAdd BLAST19
Transmembranei329 – 352Helical; Name=VUniRule annotationAdd BLAST24
Transmembranei368 – 394Helical; Name=VIUniRule annotationAdd BLAST27
Transmembranei416 – 438Helical; Name=VIIUniRule annotationAdd BLAST23
Transmembranei516 – 534Helical; Name=VIIIUniRule annotationAdd BLAST19
Transmembranei574 – 595Helical; Name=IXUniRule annotationAdd BLAST22
Transmembranei642 – 664Helical; Name=XUniRule annotationAdd BLAST23
Transmembranei706 – 726Helical; Name=XIUniRule annotationAdd BLAST21

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002771421 – 733Photosystem I P700 chlorophyll a apoprotein A2Add BLAST733

Proteomic databases

PRIDEiA0T0M7.

Interactioni

Subunit structurei

The PsaA/B heterodimer binds the P700 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 eukaryotic PSI reaction center is composed of at least 11 subunits.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliA0T0M7.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

InParanoidiA0T0M7.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00482. PSI_PsaB. 1 hit.
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.

A0T0M7-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MATKFPKFSQ ALAQDPATRR IWYGIATAHD LEAHDGMTEE NLYQKIFASH
60 70 80 90 100
FGHLAVIFLW TAGNLFHVAW QGNFEKWVSN PLKVKPIAHA IWDPHFGESA
110 120 130 140 150
IKAFSKGNTY PVNIAFSGVY QWWYTIGFRT NQELYLGSVG LLILASVLLF
160 170 180 190 200
AGWLHLQPKF RPSLAWFKNN ESRLNHHLSG LLGVSSLAWT GHIVHVAIPA
210 220 230 240 250
SRGVHVGWEN FLTTPPHPAG LTPFYSGDWT VYAANPDSAN HVYGTAEGAG
260 270 280 290 300
TAILTFLGGF HPQTQSLWLS DIAHHQLAIA VVFIVAGHMY RTNFGIGHNM
310 320 330 340 350
KEILDAHRPP GGRLGAGHTG LFETITNSLH MQLGLALACL GVATSLTAQH
360 370 380 390 400
MYAITPYAFL SKDFTTEAAL YTHHQYIAGF LMVGAFAHGA IFFVRDYDPE
410 420 430 440 450
LNKNNVLARM LEHKEAIISH LSWASLFLGF HTLGLYIHND TVVAFGQPEK
460 470 480 490 500
QILFEPLFAE YIQAASGKAV YEFNTLLSSS TSPATVAGNQ IWLPGWLEAI
510 520 530 540 550
NNNKNDLFLK IGPGDFLVHH AIALGLHTTT LILVKGALDA RGSKLMPDKK
560 570 580 590 600
DFGYSFPCDG PGRGGTCDIS AWDAFYLAMF WMLNTIGWVT FYWHWKHMTI
610 620 630 640 650
WGGNPGQFDE SSNYIMGWLR DYLWLNSSPL INGYNPFGMN NLSVWAWMFL
660 670 680 690 700
FGHLIWATGF MFLISWRGYW QELIETLVWA HERTPLANLV RWRDKPVALS
710 720 730
IVQARLVGLV HFTVGYVLTY AAFVIASTAG KYG
Length:733
Mass (Da):81,847
Last modified:January 9, 2007 - v1
Checksum:iDF77965FF12A2BBC
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
EF067920 Genomic DNA. Translation: ABK20581.1.
RefSeqiYP_874358.1. NC_008588.1.

Genome annotation databases

GeneIDi4524635.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
EF067920 Genomic DNA. Translation: ABK20581.1.
RefSeqiYP_874358.1. NC_008588.1.

3D structure databases

ProteinModelPortaliA0T0M7.
ModBaseiSearch...
MobiDBiSearch...

Proteomic databases

PRIDEiA0T0M7.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi4524635.

Phylogenomic databases

InParanoidiA0T0M7.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00482. PSI_PsaB. 1 hit.
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...

Entry informationi

Entry nameiPSAB_PHATC
AccessioniPrimary (citable) accession number: A0T0M7
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: October 5, 2016
This is version 50 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

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 one 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.