PSAA_PSINU
ID PSAA_PSINU Reviewed; 750 AA.
AC Q9MUJ2;
DT 16-NOV-2001, integrated into UniProtKB/Swiss-Prot.
DT 27-MAR-2002, sequence version 2.
DT 03-AUG-2022, entry version 93.
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 {ECO:0000255|HAMAP-Rule:MF_00458};
OS Psilotum nudum (Whisk fern) (Lycopodium nudum).
OG Plastid; Chloroplast.
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Polypodiopsida; Ophioglossidae; Psilotales; Psilotaceae; Psilotum.
OX NCBI_TaxID=3240;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Kingyoku;
RX PubMed=15240838; DOI=10.1093/molbev/msh203;
RA Nishiyama T., Wolf P.G., Kugita M., Sinclair R.B., Sugita M., Sugiura C.,
RA Wakasugi T., Yamada K., Yoshinaga K., Yamaguchi K., Ueda K., Hasebe M.;
RT "Chloroplast phylogeny indicates that bryophytes are monophyletic.";
RL Mol. Biol. Evol. 21:1813-1819(2004).
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 12-730.
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; AP004638; BAB84216.1; -; Genomic_DNA.
DR EMBL; AF180023; AAF29824.1; -; Genomic_DNA.
DR RefSeq; NP_569629.1; NC_003386.1.
DR AlphaFoldDB; Q9MUJ2; -.
DR SMR; Q9MUJ2; -.
DR PRIDE; Q9MUJ2; -.
DR GeneID; 2545133; -.
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..750
FT /note="Photosystem I P700 chlorophyll a apoprotein A1"
FT /id="PRO_0000088573"
FT TRANSMEM 70..93
FT /note="Helical; Name=I"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 156..179
FT /note="Helical; Name=II"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 195..219
FT /note="Helical; Name=III"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 291..309
FT /note="Helical; Name=IV"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 346..369
FT /note="Helical; Name=V"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 385..411
FT /note="Helical; Name=VI"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 433..455
FT /note="Helical; Name=VII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 531..549
FT /note="Helical; Name=VIII"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 589..610
FT /note="Helical; Name=IX"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 664..686
FT /note="Helical; Name=X"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT TRANSMEM 724..744
FT /note="Helical; Name=XI"
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 582
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 675
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 683
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 691
FT /ligand="chlorophyll a"
FT /ligand_id="ChEBI:CHEBI:58416"
FT /ligand_label="A3"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
FT BINDING 692
FT /ligand="phylloquinone"
FT /ligand_id="ChEBI:CHEBI:18067"
FT /ligand_label="A"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00458"
SQ SEQUENCE 750 AA; 83335 MW; 18CC7448945C0C0D CRC64;
MTIRSPEPEV KILVERDPVK TSLEKWAQPG HFSRTLAKGP NTTTWIWNLH ADSHDFDSHT
NDLEEISRKV FSAHFGQLAI IFVWLSGMYF HGARFSNYEA WLSDPIHIKP SAQVVWPIVG
QEILNGDVGG GFQGIQITSG FFQIWRASGI TSELQLYCTA IGALIFATLM LFAGWFHYHK
AAPKLAWFQD VESMLNHHLA GLLGLGSLAW AGHQVHVSLP INQLLDAGVD PKEIPLPHEF
ILNRDLLAQL YPSFAKGLIP FFTLNWSEYS DFLTFRGGLN PVTGGLWLTD TVHHHLAIAV
LFLVAGHMYR TNWSIGHSIK EILEAHEGPF TGEGHKGIFE ILTTSWHAQL ALNLAMLGSL
TIIVAHHMYS MPPYPYLAID YGTQLSLFTH HMWIGGFLVV GAAAHAAIFM VRDYDPTTQY
NNLLDRVLRH RDAIISHLNW VCIFLGFHSF GLYIHNDTMS ALGRPQDMFS DTAIQLQPIF
AQWVQNTHAS APGLTAPNAI ASTSLTWGGD NLIAVGGKVA LLPIPLGTAD FLVHHIHAFT
IHVTVLILLK GVLFARSSRL IPDKANLGFR FPCDGPGRGG TCQVSAWDHV FLGLFWMYNS
ISIVIFHFSW KMQSDVWGSI NDQGVINHIT GGNFAQSSTT INGWLRDFLW AQASQVIQSY
GSSLSAYGLL FLGAHFVWAF SLMFLFSGRG YWQELIESII WAHNKLKVAP AIQPRALSIV
QGRAVGVAHY LLGGIATTWA FFLARIIAVG
