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A0T0M7

- PSAB_PHATC

UniProt

A0T0M7 - PSAB_PHATC

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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: 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 By similarity.UniRule annotation

Catalytic activityi

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

Cofactori

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 By similarity.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi558 – 5581Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi653 – 6531Magnesium (chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal bindingi661 – 6611Magnesium (chlorophyll-a B3 axial ligand) By similarity
Binding sitei669 – 6691Chlorophyll-a B3 By similarity
Binding sitei670 – 6701Phylloquinone 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

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2 (EC:1.97.1.12)
Alternative name(s):
PSI-B
PsaB
Gene namesi
Name:psaB
Encoded oniPlastid; Chloroplast
OrganismiPhaeodactylum tricornutum (strain CCAP 1055/1)
Taxonomic identifieri556484 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaBacillariophyceaeBacillariophycidaeNaviculalesPhaeodactylaceaePhaeodactylum
ProteomesiUP000000759: Chloroplast

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei46 – 6924Helical; Name=I; Reviewed prediction
Add
BLAST
Transmembranei134 – 15724Helical; Name=II; Reviewed prediction
Add
BLAST
Transmembranei174 – 19825Helical; Name=III; Reviewed prediction
Add
BLAST
Transmembranei272 – 29019Helical; Name=IV; Reviewed prediction
Add
BLAST
Transmembranei329 – 35224Helical; Name=V; Reviewed prediction
Add
BLAST
Transmembranei368 – 39427Helical; Name=VI; Reviewed prediction
Add
BLAST
Transmembranei416 – 43823Helical; Name=VII; Reviewed prediction
Add
BLAST
Transmembranei516 – 53419Helical; Name=VIII; Reviewed prediction
Add
BLAST
Transmembranei574 – 59522Helical; Name=IX; Reviewed prediction
Add
BLAST
Transmembranei642 – 66423Helical; Name=X; Reviewed prediction
Add
BLAST
Transmembranei706 – 72621Helical; Name=XI; Reviewed prediction
Add
BLAST

GO - Cellular componenti

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

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 733733Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation
PRO_0000277142Add
BLAST

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 By similarity.

Structurei

3D structure databases

ProteinModelPortaliA0T0M7.
SMRiA0T0M7. Positions 2-732.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.

Keywords - Domaini

Transmembrane, Transmembrane helix

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.

A0T0M7-1 [UniParc]FASTAAdd to Basket

« Hide

MATKFPKFSQ ALAQDPATRR IWYGIATAHD LEAHDGMTEE NLYQKIFASH    50
FGHLAVIFLW TAGNLFHVAW QGNFEKWVSN PLKVKPIAHA IWDPHFGESA 100
IKAFSKGNTY PVNIAFSGVY QWWYTIGFRT NQELYLGSVG LLILASVLLF 150
AGWLHLQPKF RPSLAWFKNN ESRLNHHLSG LLGVSSLAWT GHIVHVAIPA 200
SRGVHVGWEN FLTTPPHPAG LTPFYSGDWT VYAANPDSAN HVYGTAEGAG 250
TAILTFLGGF HPQTQSLWLS DIAHHQLAIA VVFIVAGHMY RTNFGIGHNM 300
KEILDAHRPP GGRLGAGHTG LFETITNSLH MQLGLALACL GVATSLTAQH 350
MYAITPYAFL SKDFTTEAAL YTHHQYIAGF LMVGAFAHGA IFFVRDYDPE 400
LNKNNVLARM LEHKEAIISH LSWASLFLGF HTLGLYIHND TVVAFGQPEK 450
QILFEPLFAE YIQAASGKAV YEFNTLLSSS TSPATVAGNQ IWLPGWLEAI 500
NNNKNDLFLK IGPGDFLVHH AIALGLHTTT LILVKGALDA RGSKLMPDKK 550
DFGYSFPCDG PGRGGTCDIS AWDAFYLAMF WMLNTIGWVT FYWHWKHMTI 600
WGGNPGQFDE SSNYIMGWLR DYLWLNSSPL INGYNPFGMN NLSVWAWMFL 650
FGHLIWATGF MFLISWRGYW QELIETLVWA HERTPLANLV RWRDKPVALS 700
IVQARLVGLV HFTVGYVLTY AAFVIASTAG KYG 733
Length:733
Mass (Da):81,847
Last modified:January 9, 2007 - v1
Checksum:iDF77965FF12A2BBC
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
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:
EMBL
GenBank
DDBJ
Links Updated
EF067920 Genomic DNA. Translation: ABK20581.1 .
RefSeqi YP_874358.1. NC_008588.1.

3D structure databases

ProteinModelPortali A0T0M7.
SMRi A0T0M7. Positions 2-732.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524635.

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. "Chloroplast genomes of the diatoms Phaeodactylum tricornutum and Thalassiosira pseudonana: comparison with other plastid genomes of the red lineage."
    Oudot-Le Secq M.-P., Grimwood J., Shapiro H., Armbrust E.V., Bowler C., Green B.R.
    Mol. Genet. Genomics 277:427-439(2007) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: CCAP 1055/1.

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: May 14, 2014
This is version 43 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

External Data

Dasty 3

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