PSAA_EPHTW
ID PSAA_EPHTW Reviewed; 720 AA.
AC Q9MUJ8;
DT 16-NOV-2001, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2000, sequence version 1.
DT 03-AUG-2022, entry version 87.
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 Ephedra tweediana (Vining horsetail).
OG Plastid; Chloroplast.
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Gnetopsida; Gnetidae; Ephedrales; Ephedraceae; Ephedra.
OX NCBI_TaxID=3390;
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; AF180017; AAF29818.1; -; Genomic_DNA.
DR AlphaFoldDB; Q9MUJ8; -.
DR SMR; Q9MUJ8; -.
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..>720
FT /note="Photosystem I P700 chlorophyll a apoprotein A1"
FT /id="PRO_0000088547"
FT TRANSMEM 62..85
FT /note="Helical; Name=I"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 148..171
FT /note="Helical; Name=II"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 186..210
FT /note="Helical; Name=III"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 282..300
FT /note="Helical; Name=IV"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 337..360
FT /note="Helical; Name=V"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 376..402
FT /note="Helical; Name=VI"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 424..446
FT /note="Helical; Name=VII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 522..540
FT /note="Helical; Name=VIII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 580..601
FT /note="Helical; Name=IX"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 655..677
FT /note="Helical; Name=X"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 715..>720
FT /note="Helical; Name=XI"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT BINDING 564
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 573
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 666
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 674
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 682
FT /ligand="chlorophyll a"
FT /ligand_id="ChEBI:CHEBI:58416"
FT /ligand_label="A3"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT BINDING 683
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 720
SQ SEQUENCE 720 AA; 80254 MW; 1A6087073CE3B9EE CRC64;
IKIMVERDPI KTSFEKWANP GHFSRTLAKG DPETTTWIWN LHADAHDFDS HTEDLEEISR
KIFSAHFGQL AIIFIWLSGM YFHGARFSNY EAWLADPTHI KPSAQVVWPI VGQEILNGDV
GGGFRGIQIT SGFFPIWRAS GITSELQLYC TAIGGLIFAA LMLFAGWFHY HKAAPKLSWF
QVESMLNHHL AGLLGLGSLS WAGHQVHVSL PINQLLDAGV DPKEIPLPHE FILNRDLLIQ
LYPSFSKGLT PFFTLNWSEY SEILTFRGGL NPITGGLWLT DIVHHHLAIA VIFLIAGHMY
KTNWGIGHSI QEILEAHKGP FTGEGHKGLY EILTTSWHAQ LALNLAILGS LTIVVAHHMY
SMPPYPYLAI DYGTQLSLFT HHMWIGGFVI IGAAAHAAIF LVRDYDSTTS YNNLFDRVLR
HRDAIISHLN WTCIFLGFHS FGLYIHNDTM SALGRPQDMF SDTAIQLQPI FAQWLQNTHV
TAPRFTAPAA TASTSFTWGG NDLVTVGTKV ALLPIPLGTA DFLVHHIHAF TIHVTVLILL
KGVLFARSSR LIPDKANLGF RFPCDGPGRG GTCQVSAWDH VFLGLFWMYN AISVVIFHFS
WKMQSDVWGN ISTQGVVTHI TGGNFAQSSV TINGWLRDFL WAQASQVIQS YGSALSAYGL
FFLGAHFVWA FSLMFLFSGR GYWQELIESI VWAHNKLKVA PAIQPRALSI VQGRAVGVAH
