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A0T0M9

- PSAB_THAPS

UniProt

A0T0M9 - PSAB_THAPS

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
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    • History
      Entry version 44 (01 Oct 2014)
      Sequence version 1 (09 Jan 2007)
      Previous versions | rss
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    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

    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)LengthDescriptionGraphical viewFeature identifierActions
    Metal bindingi558 – 5581Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
    Metal bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
    Metal bindingi653 – 6531Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation
    Metal bindingi661 – 6611Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation
    Binding sitei669 – 6691Chlorophyll-a B3UniRule annotation
    Binding sitei670 – 6701Phylloquinone BUniRule annotation

    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

    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
    OrganismiThalassiosira pseudonana (Marine diatom) (Cyclotella nana)
    Taxonomic identifieri35128 [NCBI]
    Taxonomic lineageiEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira
    ProteomesiUP000001449: Chloroplast

    Subcellular locationi

    GO - Cellular componenti

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

    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 A2PRO_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.UniRule annotation

    Structurei

    3D structure databases

    ProteinModelPortaliA0T0M9.
    SMRiA0T0M9. Positions 2-732.
    ModBaseiSearch...
    MobiDBiSearch...

    Transmembrane

    Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
    Transmembranei46 – 6924Helical; Name=IUniRule annotationAdd
    BLAST
    Transmembranei134 – 15724Helical; Name=IIUniRule annotationAdd
    BLAST
    Transmembranei174 – 19825Helical; Name=IIIUniRule annotationAdd
    BLAST
    Transmembranei272 – 29019Helical; Name=IVUniRule annotationAdd
    BLAST
    Transmembranei329 – 35224Helical; Name=VUniRule annotationAdd
    BLAST
    Transmembranei368 – 39427Helical; Name=VIUniRule annotationAdd
    BLAST
    Transmembranei416 – 43823Helical; Name=VIIUniRule annotationAdd
    BLAST
    Transmembranei516 – 53419Helical; Name=VIIIUniRule annotationAdd
    BLAST
    Transmembranei574 – 59522Helical; Name=IXUniRule annotationAdd
    BLAST
    Transmembranei642 – 66423Helical; Name=XUniRule annotationAdd
    BLAST
    Transmembranei706 – 72621Helical; Name=XIUniRule annotationAdd
    BLAST

    Family & Domainsi

    Sequence similaritiesi

    Belongs to the PsaA/PsaB family.UniRule annotation

    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: October 1, 2014
    This is version 44 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