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B8HLB1

- B8HLB1_CYAP4

UniProt

B8HLB1 - B8HLB1_CYAP4

Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Cyanothece sp. (strain PCC 7425 / ATCC 29141)
Status
Unreviewed - Annotation score: 4 out of 5- Protein inferred from homologyi
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    • History
      Entry version 45 (01 Oct 2014)
      Sequence version 1 (03 Mar 2009)
      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
    PsaA and psaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX.UniRule annotation

    Catalytic activityi

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

    Cofactori

    PSI electron transfer chain: 5 chlorophyll a, 1 chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. 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 bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
    Metal bindingi576 – 5761Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
    Metal bindingi662 – 6621Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation
    Metal bindingi670 – 6701Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation
    Binding sitei678 – 6781Chlorophyll-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

    OxidoreductaseUniRule annotation

    Keywords - Biological processi

    Electron transportUniRule annotation, Photosynthesis, Transport

    Keywords - Ligandi

    4Fe-4SUniRule annotation, ChlorophyllUniRule annotation, Chromophore, Iron, Iron-sulfur, MagnesiumUniRule annotation, Metal-binding

    Enzyme and pathway databases

    BioCyciCSP395961:GJDE-4516-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:Cyan7425_4670Imported
    OrganismiCyanothece sp. (strain PCC 7425 / ATCC 29141)Imported
    Taxonomic identifieri395961 [NCBI]
    Taxonomic lineageiBacteriaCyanobacteriaOscillatoriophycideaeChroococcalesCyanothece
    ProteomesiUP000002511: Chromosome

    Subcellular locationi

    Cellular thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation
    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 IUniRule annotation, ThylakoidUniRule annotation

    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 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

    STRINGi395961.Cyan7425_4670.

    Structurei

    Transmembrane

    Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
    Transmembranei39 – 7032Helical; Name=IUniRule annotationAdd
    BLAST
    Transmembranei132 – 15625Helical; Name=IIUniRule annotationAdd
    BLAST
    Transmembranei173 – 19523Helical; Name=IIIUniRule annotationAdd
    BLAST
    Transmembranei270 – 28718Helical; Name=IVUniRule annotationAdd
    BLAST
    Transmembranei336 – 35924Helical; Name=VUniRule annotationAdd
    BLAST
    Transmembranei370 – 40132Helical; Name=VIUniRule annotationAdd
    BLAST
    Transmembranei421 – 45030Helical; Name=VIIUniRule annotationAdd
    BLAST
    Transmembranei522 – 54625Helical; Name=VIIIUniRule annotationAdd
    BLAST
    Transmembranei580 – 61132Helical; Name=IXUniRule annotationAdd
    BLAST
    Transmembranei652 – 67322Helical; Name=XUniRule annotationAdd
    BLAST
    Transmembranei710 – 73829Helical; Name=XIUniRule annotationAdd
    BLAST

    Family & Domainsi

    Sequence similaritiesi

    Belongs to the PsaA/PsaB family.UniRule annotation

    Keywords - Domaini

    Transmembrane, Transmembrane helixUniRule annotation

    Phylogenomic databases

    eggNOGiNOG04867.
    HOGENOMiHOG000276868.
    KOiK02690.
    OMAiAQFNESS.
    OrthoDBiEOG60W7PS.

    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.

    B8HLB1-1 [UniParc]FASTAAdd to Basket

    « Hide

    MATRFPKFSQ DLAQDPTTRR IWYAIATAHD FESHDGMTEE NLYQKIFASH    50
    FGHLAIIFLW TSGSLFHVAW QGNFEQWIKD PLNIRPIAHA IWDPQFGKPA 100
    VDAFTQAGAS SPVDIAYSGV YHWWYTIGMR TNSDLYMGAI TLLLFAAVFL 150
    FAGWLHLQPK FRPSLAWFKN AESRLNHHLA GLFGVSSLAW AGHLIHVAIP 200
    EARGQHVGWD NFLSTMPHPA GLAPFFTGNW GVYAQNPDTA GHVFGTSEGA 250
    GTAILTFLGG FHPQTESLWL TDIAHHHLAI AVIFIIAGHM YRTNFGIGHS 300
    MKEIMNAHNP PQGTPFGGML GAGHQGMYDT YNNSLHFQLG WHLACLGVVT 350
    SLVAQHMYSL PPYAFIAQDH TTMAALYTHH QYIAGFLMVG AFAHGAIFLV 400
    RDYDPAANKN NVLARVLEHK EAIISHLSWV SLFLGFHTLG LYVHNDVVVA 450
    FGTPEKQILI EPVFAQFIQA AHGKVLYGFD TLLSNPDSIA TTAWPNYGNV 500
    WLPGWLDAIN SGTNSLFLTI GPGDFLVHHA IALGLHTTTL ILVKGALDAR 550
    GSKLMPDKKD FGYAFPCDGP GRGGTCDISG WDAFYLSMFW MLNTIGWVTF 600
    YWHWKHLGIW EGNVAQFNES STYLMGWLRD YLWLYSGPLI NGYNPFGMNN 650
    LAVWSWMFLF GHLVWATGFM FLISWRGYWQ ELIETLVWAH ERTPLANLVR 700
    WKDKPVALSI VQARLVGLAH FTVGYIVTYA AFLIASTAAK YG 742
    Length:742
    Mass (Da):82,907
    Last modified:March 3, 2009 - v1
    Checksum:i96B36B749D0A0B07
    GO

    Sequence databases

    Select the link destinations:
    EMBL
    GenBank
    DDBJ
    Links Updated
    CP001344 Genomic DNA. Translation: ACL46976.1.
    RefSeqiWP_012630018.1. NC_011884.1.
    YP_002485337.1. NC_011884.1.

    Genome annotation databases

    EnsemblBacteriaiACL46976; ACL46976; Cyan7425_4670.
    GeneIDi7290623.
    KEGGicyn:Cyan7425_4670.
    PATRICi21570339. VBICyaSp30657_4659.

    Cross-referencesi

    Sequence databases

    Select the link destinations:
    EMBL
    GenBank
    DDBJ
    Links Updated
    CP001344 Genomic DNA. Translation: ACL46976.1 .
    RefSeqi WP_012630018.1. NC_011884.1.
    YP_002485337.1. NC_011884.1.

    3D structure databases

    ModBasei Search...
    MobiDBi Search...

    Protein-protein interaction databases

    STRINGi 395961.Cyan7425_4670.

    Protocols and materials databases

    Structural Biology Knowledgebase Search...

    Genome annotation databases

    EnsemblBacteriai ACL46976 ; ACL46976 ; Cyan7425_4670 .
    GeneIDi 7290623.
    KEGGi cyn:Cyan7425_4670.
    PATRICi 21570339. VBICyaSp30657_4659.

    Phylogenomic databases

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

    Enzyme and pathway databases

    BioCyci CSP395961:GJDE-4516-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. "Novel metabolic attributes of the genus Cyanothece, comprising a group of unicellular nitrogen-fixing Cyanobacteria."
      Bandyopadhyay A., Elvitigala T., Welsh E., Stockel J., Liberton M., Min H., Sherman L.A., Pakrasi H.B.
      MBio 2:E214-E214(2011) [PubMed] [Europe PMC] [Abstract]
      Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
      Strain: PCC 7425 / ATCC 29141Imported.

    Entry informationi

    Entry nameiB8HLB1_CYAP4
    AccessioniPrimary (citable) accession number: B8HLB1
    Entry historyi
    Integrated into UniProtKB/TrEMBL: March 3, 2009
    Last sequence update: March 3, 2009
    Last modified: October 1, 2014
    This is version 45 of the entry and version 1 of the sequence. [Complete history]
    Entry statusiUnreviewed (UniProtKB/TrEMBL)

    Miscellaneousi

    Keywords - Technical termi

    Complete proteome, Reference proteomeImported

    External Data

    Dasty 3