ID   PSBI_SYNJB              Reviewed;          38 AA.
AC   Q2JJ02;
DT   21-AUG-2007, integrated into UniProtKB/Swiss-Prot.
DT   07-MAR-2006, sequence version 1.
DT   25-MAY-2022, entry version 77.
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=CYB_2458;
OS   Synechococcus sp. (strain JA-2-3B'a(2-13)) (Cyanobacteria bacterium
OS   Yellowstone B-Prime).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=321332;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=JA-2-3B'a(2-13);
RX   PubMed=18059494; DOI=10.1038/ismej.2007.46;
RA   Bhaya D., Grossman A.R., Steunou A.-S., Khuri N., Cohan F.M., Hamamura N.,
RA   Melendrez M.C., Bateson M.M., Ward D.M., Heidelberg J.F.;
RT   "Population level functional diversity in a microbial community revealed by
RT   comparative genomic and metagenomic analyses.";
RL   ISME J. 1:703-713(2007).
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: Cyanobacterial PSII is composed of 1 copy each of membrane
CC       proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK,
CC       PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral
CC       proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms
CC       dimeric complexes. {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01316}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01316}.
CC   -!- SIMILARITY: Belongs to the PsbI family. {ECO:0000255|HAMAP-
CC       Rule:MF_01316}.
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DR   EMBL; CP000240; ABD03392.1; -; Genomic_DNA.
DR   RefSeq; WP_011434021.1; NC_007776.1.
DR   AlphaFoldDB; Q2JJ02; -.
DR   SMR; Q2JJ02; -.
DR   STRING; 321332.CYB_2458; -.
DR   KEGG; cyb:CYB_2458; -.
DR   eggNOG; ENOG5033CII; Bacteria.
DR   HOGENOM; CLU_212150_0_0_3; -.
DR   Proteomes; UP000001938; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
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   PANTHER; PTHR35772; PTHR35772; 1.
DR   Pfam; PF02532; PsbI; 1.
DR   SUPFAM; SSF161041; SSF161041; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem II; Reaction center;
KW   Reference proteome; Thylakoid; Transmembrane; Transmembrane helix.
FT   CHAIN           1..38
FT                   /note="Photosystem II reaction center protein I"
FT                   /id="PRO_0000298305"
FT   TRANSMEM        1..21
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01316"
SQ   SEQUENCE   38 AA;  4388 MW;  4392D8C842F2786F CRC64;
     MLLLKISVYA VVIFFVGLFV FGFLSNDPSR NPNRRDLE