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PSAA_BIGNA
ID   PSAA_BIGNA              Reviewed;         751 AA.
AC   Q06J42;
DT   10-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   31-OCT-2006, sequence version 1.
DT   03-AUG-2022, entry version 61.
DE   RecName: Full=Photosystem I P700 chlorophyll a apoprotein A1 {ECO:0000255|HAMAP-Rule:MF_00458};
DE            EC=1.97.1.12 {ECO:0000255|HAMAP-Rule:MF_00458};
DE   AltName: Full=PSI-A {ECO:0000255|HAMAP-Rule:MF_00458};
DE   AltName: Full=PsaA {ECO:0000255|HAMAP-Rule:MF_00458};
GN   Name=psaA-A {ECO:0000255|HAMAP-Rule:MF_00458};
GN   and
GN   Name=psaA-B {ECO:0000255|HAMAP-Rule:MF_00458};
OS   Bigelowiella natans (Pedinomonas minutissima) (Chlorarachnion sp. (strain
OS   CCMP621)).
OG   Plastid; Chloroplast.
OC   Eukaryota; Sar; Rhizaria; Cercozoa; Chlorarachniophyceae; Bigelowiella.
OX   NCBI_TaxID=227086;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=16990439; DOI=10.1093/molbev/msl129;
RA   Rogers M.B., Gilson P.R., Su V., McFadden G.I., Keeling P.J.;
RT   "The complete chloroplast genome of the chlorarachniophyte Bigelowiella
RT   natans: evidence for independent origins of chlorarachniophyte and euglenid
RT   secondary endosymbionts.";
RL   Mol. Biol. Evol. 24:54-62(2007).
CC   -!- FUNCTION: PsaA and PsaB bind P700, the primary electron donor of
CC       photosystem I (PSI), as well as the electron acceptors A0, A1 and FX.
CC       PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase,
CC       converting photonic excitation into a charge separation, which
CC       transfers an electron from the donor P700 chlorophyll pair to the
CC       spectroscopically characterized acceptors A0, A1, FX, FA and FB in
CC       turn. Oxidized P700 is reduced on the lumenal side of the thylakoid
CC       membrane by plastocyanin or cytochrome c6.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=hnu + oxidized [2Fe-2S]-[ferredoxin] + reduced [plastocyanin]
CC         = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin];
CC         Xref=Rhea:RHEA:30407, Rhea:RHEA-COMP:10000, Rhea:RHEA-COMP:10001,
CC         Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:29036,
CC         ChEBI:CHEBI:30212, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738,
CC         ChEBI:CHEBI:49552; EC=1.97.1.12; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00458};
CC   -!- COFACTOR:
CC       Note=P700 is a chlorophyll a/chlorophyll a' dimer, A0 is one or more
CC       chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-
CC       4S iron-sulfur center. {ECO:0000255|HAMAP-Rule:MF_00458};
CC   -!- SUBUNIT: The PsaA/B heterodimer binds the P700 chlorophyll special pair
CC       and subsequent electron acceptors. PSI consists of a core antenna
CC       complex that captures photons, and an electron transfer chain that
CC       converts photonic excitation into a charge separation. The eukaryotic
CC       PSI reaction center is composed of at least 11 subunits.
CC       {ECO:0000255|HAMAP-Rule:MF_00458}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_00458}; Multi-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_00458}.
CC   -!- SIMILARITY: Belongs to the PsaA/PsaB family. {ECO:0000255|HAMAP-
CC       Rule:MF_00458}.
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DR   EMBL; DQ851108; ABG91408.1; -; Genomic_DNA.
DR   EMBL; DQ851108; ABG91417.1; -; Genomic_DNA.
DR   RefSeq; YP_778576.1; NC_008408.1.
DR   RefSeq; YP_778585.1; NC_008408.1.
DR   AlphaFoldDB; Q06J42; -.
DR   SMR; Q06J42; -.
DR   GeneID; 4352993; -.
DR   GeneID; 4353002; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009522; C:photosystem I; IEA:UniProtKB-KW.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0016168; F:chlorophyll binding; IEA:UniProtKB-KW.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   Gene3D; 1.20.1130.10; -; 1.
DR   HAMAP; MF_00458; PSI_PsaA; 1.
DR   InterPro; IPR006243; PSI_PsaA.
DR   InterPro; IPR001280; PSI_PsaA/B.
DR   InterPro; IPR020586; PSI_PsaA/B_CS.
DR   InterPro; IPR036408; PSI_PsaA/B_sf.
DR   PANTHER; PTHR30128:SF61; PTHR30128:SF61; 1.
DR   Pfam; PF00223; PsaA_PsaB; 1.
DR   PIRSF; PIRSF002905; PSI_A; 1.
DR   PRINTS; PR00257; PHOTSYSPSAAB.
DR   SUPFAM; SSF81558; SSF81558; 1.
DR   TIGRFAMs; TIGR01335; psaA; 1.
DR   PROSITE; PS00419; PHOTOSYSTEM_I_PSAAB; 1.
PE   3: Inferred from homology;
KW   4Fe-4S; Chlorophyll; Chloroplast; Chromophore; Electron transport; Iron;
KW   Iron-sulfur; Magnesium; Membrane; Metal-binding; Oxidoreductase;
KW   Photosynthesis; Photosystem I; Plastid; Thylakoid; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..751
FT                   /note="Photosystem I P700 chlorophyll a apoprotein A1"
FT                   /id="PRO_0000294231"
FT   TRANSMEM        73..96
FT                   /note="Helical; Name=I"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        159..182
FT                   /note="Helical; Name=II"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        198..222
FT                   /note="Helical; Name=III"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        294..312
FT                   /note="Helical; Name=IV"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        349..372
FT                   /note="Helical; Name=V"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        388..414
FT                   /note="Helical; Name=VI"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        436..458
FT                   /note="Helical; Name=VII"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        533..551
FT                   /note="Helical; Name=VIII"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        591..612
FT                   /note="Helical; Name=IX"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        665..687
FT                   /note="Helical; Name=X"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   TRANSMEM        725..745
FT                   /note="Helical; Name=XI"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         575
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         584
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         676
FT                   /ligand="chlorophyll a'"
FT                   /ligand_id="ChEBI:CHEBI:189419"
FT                   /ligand_label="A1"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         684
FT                   /ligand="chlorophyll a"
FT                   /ligand_id="ChEBI:CHEBI:58416"
FT                   /ligand_label="A3"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         692
FT                   /ligand="chlorophyll a"
FT                   /ligand_id="ChEBI:CHEBI:58416"
FT                   /ligand_label="A3"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT   BINDING         693
FT                   /ligand="phylloquinone"
FT                   /ligand_id="ChEBI:CHEBI:18067"
FT                   /ligand_label="A"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
SQ   SEQUENCE   751 AA;  83932 MW;  80A4F4A40597F03A CRC64;
     MAIDVSNQND DLVKVVVDVD PVPTDFERWA KPGHFSRSLS KGPLTTTWIW NLHADVHDFD
     GYSTNLQDIS RKIFSAHFGQ LGIIFIWLSG MYFHGARFSN YEAWLSNPAK IKPSAQVVWP
     IVGQDILNGD VGDGFRGVQI TSGLFHVWRA SGITNELELF STAIGGLVMA FLMFFAGWFH
     YHKAAPKLQW FQNAESMLNH HLSGLLGLGS LSWAGHQIHI AIPINKLLDK GVSASEIPLP
     HEFLVDKTQM INIFPSFEKG LTPFFTLNWK EYSDFLTFQG GLDPQTGSLW LTDIAHHHLA
     IAVLFIVAGH MYKTNWSIGH RLKEILEGHK VLSVSKGHSG LYEIFTTSWH AQLSLNLAML
     GSLSIIVAHH MYAMPPYPYI SVDYATQLSL FTHHMWIGGF CIVGAGAHAS IFMVRDYNPA
     DNYNNLLDRI ICQRDAIISH LNWACIFLGL HSFGLYIHND TMSALGRSDD MFSDTAIQLQ
     PIFSQFIQRI HYMTIESTAP YVSHGTSPAW GGDIVAINGK IAMMPISLGT SDFMVHHIHA
     FTIHVTVLIL LKGVLFSRNS RLIPDKSNLG FRFPCDGPGR GGTCQVSAWD HVFLGLFWMY
     NSLSIVIFHF SWKLQSDVWG NVNSSVVSHI TRGNFAQSAN TINGWLRDFL WSQSSQVIQS
     YGSSLSAYGL IFLGAHFVWA FSLMFLFSGR GYWQELIESI VWAHNKLKVA PAIAPRALSI
     TQGRAVGVAH YLLGGIGTTW SFFLARIISV N
 
 
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