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A0T0M9

- PSAB_THAPS

UniProt

A0T0M9 - PSAB_THAPS

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Protein
Photosystem I P700 chlorophyll a apoprotein A2
Gene
psaB
Organism
Thalassiosira pseudonana (Marine diatom) (Cyclotella nana)
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
OrganismiThalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Taxonomic identifieri35128 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira
ProteomesiUP000001449: 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_0000277143Add
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

ProteinModelPortaliA0T0M9.
SMRiA0T0M9. Positions 2-732.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG04867.
HOGENOMiHOG000276868.

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.

A0T0M9-1 [UniParc]FASTAAdd to Basket

« Hide

MATKFPKFSQ ALAQDPATRR IWYGIATAHD LEAHDGMTEE NLYQKIFASH    50
FGHLAIIFLW TSGNLFHVAW QGNFEKWVSN PLKTRPIAHS IWDPHFGESA 100
LKAFSKGNTY PVNITFSGLY QWWYTIGFRT NQELYKGSIG LLLLASVLLI 150
AGWLHLQPKF RPSLSWFKNN ESRLNHHLSG LLGFSSLAWT GHLVHVAIPA 200
SRGVHVGWDN FLTTPPHPAG LTPFFTGNWT VYAENPDSAT HVFNTSEGSG 250
TAILTFLGGF HPQTQSLWLS DMAHHHLAIA VVFIVAGHMY RTNFGIGHNM 300
KEILDAHRPP GGRLGAGHVG LFETITNSLH MQLGLALACL GVATSLTAQH 350
MYALTPYAYL SKDFTTEAAL YTHHQYIAGF LMVGAFAHGA IFFVRDYDPE 400
LNKNNVLARM LEHKEAIISH LSWASLFLGF HTLGLYIHND TVVAFGQPEK 450
QILFEPLFAE YIQAASGKAV YQFNVLLASS TSPATAAGNQ VWLPGWLEAI 500
NNPKTDLFLK IGPGDFLVHH AIALGLHVTA LILVKGALDA RGSKLMPDKK 550
DFGYSFPCDG PGRGGTCDIS AWDAFYLAMF WMLNTIGWVT FYWHWKHMTI 600
WGGNPGQFDE SSNYIMGWLR DYLWLNSSPL INGYNPFGMN NLSVWSWMFL 650
FGHLIWATGF MFLISWRGYW QELIETLVWA HERTPLANLI RWRDKPVALS 700
IVQARLVGLV HFSVGYILTY AAFVIASTSG KFA 733
Length:733
Mass (Da):82,089
Last modified:January 9, 2007 - v1
Checksum:iF5C6FCBE674FB914
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20714.1.
RefSeqiYP_874491.1. NC_008589.1.

Genome annotation databases

GeneIDi4524814.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20714.1 .
RefSeqi YP_874491.1. NC_008589.1.

3D structure databases

ProteinModelPortali A0T0M9.
SMRi A0T0M9. Positions 2-732.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524814.

Phylogenomic databases

eggNOGi NOG04867.
HOGENOMi HOG000276868.

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: CCMP1335.

Entry informationi

Entry nameiPSAB_THAPS
AccessioniPrimary (citable) accession number: A0T0M9
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: June 11, 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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