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Q46IV5

- PSAB_PROMT

UniProt

Q46IV5 - PSAB_PROMT

Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Prochlorococcus marinus (strain NATL2A)
Status
Reviewed - Annotation score: 3 out of 5- Protein inferred from homologyi
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    • History
      Entry version 66 (01 Oct 2014)
      Sequence version 1 (13 Sep 2005)
      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

    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

    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

    Enzyme and pathway databases

    BioCyciPMAR59920:GI1O-1962-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:PMN2A_1083
    OrganismiProchlorococcus marinus (strain NATL2A)
    Taxonomic identifieri59920 [NCBI]
    Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
    ProteomesiUP000002535: Chromosome

    Subcellular locationi

    Cellular thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

    GO - Cellular componenti

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

    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_0000300022Add
    BLAST

    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

    STRINGi59920.PMN2A_1083.

    Structurei

    3D structure databases

    ProteinModelPortaliQ46IV5.
    SMRiQ46IV5. Positions 2-741.
    ModBaseiSearch...
    MobiDBiSearch...

    Transmembrane

    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

    Family & Domainsi

    Sequence similaritiesi

    Belongs to the PsaA/PsaB family.UniRule annotation

    Keywords - Domaini

    Transmembrane, Transmembrane helix

    Phylogenomic databases

    eggNOGiNOG04867.
    HOGENOMiHOG000276868.
    KOiK02690.
    OMAiAQFNESS.
    OrthoDBiEOG60W7PS.
    PhylomeDBiQ46IV5.

    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.

    Q46IV5-1 [UniParc]FASTAAdd to Basket

    « Hide

    MATKFPSFSQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE QLYQKLFSTH    50
    FGHLAIIGLW VAGNLFHIAW QGNFEQWVLD PLHTRPIAHA IWDPHFGQGL 100
    TDALTQAGAT SPVNIAYSGL YHWWYTIGMR TNEQLFQGAI FINILVCWLL 150
    FAGWLHLQPK YRPSLAWFKN AESQLNHHLA VLFGFSSIAW TGHLIHVAIP 200
    ESRGIHVGWE NWLTVMPHPE GLTPFFSGNW GAYAQNPDSI DAVFGTSQGA 250
    GTAIFTFLGG LHPQSESLWL TDIAHHHLAI GVVFIIAGHM YRTNFGIGHS 300
    LKEIIEAHNT SHPKDPHRGY FGIKHNGLFE TVNNSLHFQL GLALASLGVA 350
    CSLVAQHMGA LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFSHGAIFF 400
    VRDYDPELNK DNVLARILST KEALISHLSW VTMLLGFHTL GIYVHNDVVV 450
    AFGTPEKQIL IEPVFAQFAQ AASGKMMYGF NALLANASSS ASIAANSMPG 500
    NHYWMDMINR PDALTNFLPI GPADFLVHHA IALGLHTTAL ILIKGALDAR 550
    GTKLIPDKKD LGFAFPCDGP GRGGTCDSSS WDATYLAMFW ALNTIAWITF 600
    YWHWKHLAIW MGNTAQFNES GTYLMGWFRD YLWLNSSQLI NGYNPFGVNA 650
    LSPWAWMFLF GHLIWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG 700
    WRDKPVALSI VQARLVGLTH FTVGNFVTFG AFVIASTSGK FG 742
    Length:742
    Mass (Da):82,846
    Last modified:September 13, 2005 - v1
    Checksum:iEDEDEFBE1CD80364
    GO

    Sequence databases

    Select the link destinations:
    EMBL
    GenBank
    DDBJ
    Links Updated
    CP000095 Genomic DNA. Translation: AAZ58573.1.
    RefSeqiWP_011295427.1. NC_007335.2.
    YP_292276.1. NC_007335.2.

    Genome annotation databases

    EnsemblBacteriaiAAZ58573; AAZ58573; PMN2A_1083.
    GeneIDi3606470.
    KEGGipmn:PMN2A_1083.
    PATRICi23026027. VBIProMar14922_1940.

    Cross-referencesi

    Sequence databases

    Select the link destinations:
    EMBL
    GenBank
    DDBJ
    Links Updated
    CP000095 Genomic DNA. Translation: AAZ58573.1 .
    RefSeqi WP_011295427.1. NC_007335.2.
    YP_292276.1. NC_007335.2.

    3D structure databases

    ProteinModelPortali Q46IV5.
    SMRi Q46IV5. Positions 2-741.
    ModBasei Search...
    MobiDBi Search...

    Protein-protein interaction databases

    STRINGi 59920.PMN2A_1083.

    Protocols and materials databases

    Structural Biology Knowledgebase Search...

    Genome annotation databases

    EnsemblBacteriai AAZ58573 ; AAZ58573 ; PMN2A_1083 .
    GeneIDi 3606470.
    KEGGi pmn:PMN2A_1083.
    PATRICi 23026027. VBIProMar14922_1940.

    Phylogenomic databases

    eggNOGi NOG04867.
    HOGENOMi HOG000276868.
    KOi K02690.
    OMAi AQFNESS.
    OrthoDBi EOG60W7PS.
    PhylomeDBi Q46IV5.

    Enzyme and pathway databases

    BioCyci PMAR59920:GI1O-1962-MONOMER.

    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. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
      Strain: NATL2A.

    Entry informationi

    Entry nameiPSAB_PROMT
    AccessioniPrimary (citable) accession number: Q46IV5
    Entry historyi
    Integrated into UniProtKB/Swiss-Prot: September 11, 2007
    Last sequence update: September 13, 2005
    Last modified: October 1, 2014
    This is version 66 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, Reference proteome

    Documents

    1. SIMILARITY comments
      Index of protein domains and families

    External Data

    Dasty 3