PSAA_ENCLE
ID PSAA_ENCLE Reviewed; 719 AA.
AC Q9MUK4;
DT 16-NOV-2001, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2000, sequence version 1.
DT 03-AUG-2022, entry version 89.
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};
DE Flags: Fragment;
GN Name=psaA {ECO:0000255|HAMAP-Rule:MF_00458};
OS Encephalartos lebomboensis (Lebombo cycad).
OG Plastid; Chloroplast.
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Cycadidae; Cycadales; Zamiaceae; Encephalartos.
OX NCBI_TaxID=58035;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=10779539; DOI=10.1093/oxfordjournals.molbev.a026357;
RA Sanderson M.J., Wojciechowski M.F., Hu J.-M., Sher Khan T., Brady S.G.;
RT "Error, bias, and long-branch attraction in data for two chloroplast
RT photosystem genes in seed plants.";
RL Mol. Biol. Evol. 17:782-797(2000).
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-ferredoxin oxidoreductase, converting photonic
CC excitation into a charge separation, which transfers an electron from
CC the donor P700 chlorophyll pair to the spectroscopically characterized
CC acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on
CC the lumenal side of the thylakoid membrane by plastocyanin.
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; AF180011; AAF29812.1; -; Genomic_DNA.
DR AlphaFoldDB; Q9MUK4; -.
DR SMR; Q9MUK4; -.
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:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0016491; F:oxidoreductase activity; IEA:UniProtKB-KW.
DR GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
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..>719
FT /note="Photosystem I P700 chlorophyll a apoprotein A1"
FT /id="PRO_0000088546"
FT TRANSMEM 59..82
FT /note="Helical; Name=I"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 145..168
FT /note="Helical; Name=II"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 184..208
FT /note="Helical; Name=III"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 280..298
FT /note="Helical; Name=IV"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 335..358
FT /note="Helical; Name=V"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 374..400
FT /note="Helical; Name=VI"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 422..444
FT /note="Helical; Name=VII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 520..538
FT /note="Helical; Name=VIII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 578..599
FT /note="Helical; Name=IX"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 653..675
FT /note="Helical; Name=X"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 713..>719
FT /note="Helical; Name=XI"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT BINDING 562
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 571
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 664
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 672
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 680
FT /ligand="chlorophyll a"
FT /ligand_id="ChEBI:CHEBI:58416"
FT /ligand_label="A3"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT BINDING 681
FT /ligand="phylloquinone"
FT /ligand_id="ChEBI:CHEBI:18067"
FT /ligand_label="A"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT NON_TER 1
FT NON_TER 719
SQ SEQUENCE 719 AA; 79695 MW; 01BB0E8BE39BB6ED CRC64;
IVVERDPIRT SFEKWAKPGH FSRTLAKGPN TTTWIWNLHA DAHDFGSHTN DLEEISRKVF
SAHFGQLAII FIWLSGMYFH GARFSNYEAW LSDPTHIKPS AQVVWPIVGQ EILNGDVGGG
SRGIQITSGL FQLWRASGIT SELQLYCTAI GALIFAALML FAGWFHYHKA APKLAWFQDV
ESMLNHHLAG LLGIGSLSWA GHQVHVSLPI NQLLDAGVDP KEIPLPHEFI LNRDLLAQLY
PSFAEGLTPL FTLNWSEYSE FLTFRGGLNP VTGGLWLTDT AHHHLAIAIL FLIAGHMYRT
NWGIGHSLKE ILEAHKGPFT GEGHKGLYEI LTTSWHAQLA LNLAMLGSLT IVVAHHMYSM
PPYPYLAIDY GTQLSLFTHH MWIGGFLIVG AAAHAAIFMV RDYDPTTQYN NLLDRVLRHR
DAIVSHLNWA CIFLGFHSFG LYIHNDTMSA LGRPQDMFSD TAIQLQPIFA QWVQNTHALA
PGSTAPDATA STSVTWGGGD LVAVGGKVAL LPIPLGTADF LVHHIHAFTI HVTVLILLKG
VLFARSSRLI PDKANLGFRF PCDGPGRGGT CQVSAWDHVF LGLFWMYNAI SVVIFHFSWK
MQSDVWGSIS DQGMVTHITG GNFAQSSITI NGWLRDFLWA QASQVIQSYG SSLSAYGLLF
LGAHFVWAFS LMFLFSGRGY WQELIESIVW AHNKLEVAPV IQPRALSIVQ GRAVGVAHY
