ID   PSBI_PAUCH              Reviewed;          39 AA.
AC   B1X4T6;
DT   04-NOV-2008, integrated into UniProtKB/Swiss-Prot.
DT   20-MAY-2008, sequence version 1.
DT   25-MAY-2022, entry version 40.
DE   RecName: Full=Photosystem II reaction center protein I {ECO:0000255|HAMAP-Rule:MF_01316};
DE            Short=PSII-I {ECO:0000255|HAMAP-Rule:MF_01316};
DE   AltName: Full=PSII 4.4 kDa protein {ECO:0000255|HAMAP-Rule:MF_01316};
GN   Name=psbI {ECO:0000255|HAMAP-Rule:MF_01316}; OrderedLocusNames=PCC_0521;
OS   Paulinella chromatophora.
OG   Plastid; Organellar chromatophore.
OC   Eukaryota; Sar; Rhizaria; Imbricatea; Silicofilosea; Euglyphida;
OC   Paulinellidae; Paulinella.
OX   NCBI_TaxID=39717;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=18356055; DOI=10.1016/j.cub.2008.02.051;
RA   Nowack E.C.M., Melkonian M., Gloeckner G.;
RT   "Chromatophore genome sequence of Paulinella sheds light on acquisition of
RT   photosynthesis by eukaryotes.";
RL   Curr. Biol. 18:410-418(2008).
CC   -!- FUNCTION: One of the components of the core complex of photosystem II
CC       (PSII), required for its stability and/or assembly. PSII is a light-
CC       driven water:plastoquinone oxidoreductase that uses light energy to
CC       abstract electrons from H(2)O, generating O(2) and a proton gradient
CC       subsequently used for ATP formation. It consists of a core antenna
CC       complex that captures photons, and an electron transfer chain that
CC       converts photonic excitation into a charge separation.
CC       {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC       PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins of the oxygen-
CC       evolving complex and a large number of cofactors. It forms dimeric
CC       complexes. {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- SUBCELLULAR LOCATION: Plastid, organellar chromatophore thylakoid
CC       membrane {ECO:0000255|HAMAP-Rule:MF_01316}; Single-pass membrane
CC       protein {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- SIMILARITY: Belongs to the PsbI family. {ECO:0000255|HAMAP-
CC       Rule:MF_01316}.
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DR   EMBL; CP000815; ACB42955.1; -; Genomic_DNA.
DR   RefSeq; YP_002049165.1; NC_011087.1.
DR   AlphaFoldDB; B1X4T6; -.
DR   SMR; B1X4T6; -.
DR   GeneID; 6481945; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0070118; C:organellar chromatophore thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0009536; C:plastid; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_01316; PSII_PsbI; 1.
DR   InterPro; IPR003686; PSII_PsbI.
DR   InterPro; IPR037271; PSII_PsbI_sf.
DR   Pfam; PF02532; PsbI; 1.
DR   SUPFAM; SSF161041; SSF161041; 1.
PE   3: Inferred from homology;
KW   Membrane; Organellar chromatophore; Photosynthesis; Photosystem II;
KW   Plastid; Reaction center; Thylakoid; Transmembrane; Transmembrane helix.
FT   CHAIN           1..39
FT                   /note="Photosystem II reaction center protein I"
FT                   /id="PRO_0000353245"
FT   TRANSMEM        6..26
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01316"
SQ   SEQUENCE   39 AA;  4414 MW;  740E9D282A22EE36 CRC64;
     MLALKISVYS VVFFFIGIFV FGFLASDPSR TPSRKDLED