ID   PSBU_PROM3              Reviewed;         120 AA.
AC   A2C664;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   20-FEB-2007, sequence version 1.
DT   03-AUG-2022, entry version 74.
DE   RecName: Full=Photosystem II 12 kDa extrinsic protein {ECO:0000255|HAMAP-Rule:MF_00589};
DE   AltName: Full=PS II complex 12 kDa extrinsic protein {ECO:0000255|HAMAP-Rule:MF_00589};
DE   AltName: Full=PSII-U {ECO:0000255|HAMAP-Rule:MF_00589};
DE   Flags: Precursor;
GN   Name=psbU {ECO:0000255|HAMAP-Rule:MF_00589}; OrderedLocusNames=P9303_02191;
OS   Prochlorococcus marinus (strain MIT 9303).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=59922;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9303;
RX   PubMed=18159947; DOI=10.1371/journal.pgen.0030231;
RA   Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S.,
RA   Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M.,
RA   Richardson P., Chisholm S.W.;
RT   "Patterns and implications of gene gain and loss in the evolution of
RT   Prochlorococcus.";
RL   PLoS Genet. 3:2515-2528(2007).
CC   -!- FUNCTION: Stabilizes the structure of photosystem II oxygen-evolving
CC       complex (OEC), the ion environment of oxygen evolution and protects the
CC       OEC against heat-induced inactivation. {ECO:0000255|HAMAP-
CC       Rule:MF_00589}.
CC   -!- SUBUNIT: With PsbO,P,Q and V forms the oxygen-evolving complex of
CC       photosystem II. {ECO:0000255|HAMAP-Rule:MF_00589}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00589}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00589}; Lumenal side {ECO:0000255|HAMAP-Rule:MF_00589}.
CC       Note=Associated with photosystem II at the lumenal side of the
CC       thylakoid membrane. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsbU family. {ECO:0000255|HAMAP-
CC       Rule:MF_00589}.
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DR   EMBL; CP000554; ABM76974.1; -; Genomic_DNA.
DR   AlphaFoldDB; A2C664; -.
DR   SMR; A2C664; -.
DR   STRING; 59922.P9303_02191; -.
DR   EnsemblBacteria; ABM76974; ABM76974; P9303_02191.
DR   KEGG; pmf:P9303_02191; -.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   OMA; PTMAGKI; -.
DR   BioCyc; PMAR59922:G1G80-211-MON; -.
DR   Proteomes; UP000002274; Chromosome.
DR   GO; GO:0019898; C:extrinsic component of membrane; IEA:InterPro.
DR   GO; GO:0009654; C:photosystem II oxygen evolving complex; 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   GO; GO:0042549; P:photosystem II stabilization; IEA:InterPro.
DR   HAMAP; MF_00589; PSII_PsbU; 1.
DR   InterPro; IPR010527; PSII_PsbU.
DR   Pfam; PF06514; PsbU; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Photosynthesis; Photosystem II; Signal;
KW   Thylakoid; Transport.
FT   SIGNAL          1..29
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00589"
FT   CHAIN           30..120
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_0000295784"
SQ   SEQUENCE   120 AA;  13131 MW;  AD6A0D66A0A35486 CRC64;
     MKRLLSLLTG VLVMTGLLMA LIFPQSAYAN VSDEKLGDRG EKVDLNNSSV RAFRQFPGMF
     PTIAGKIVVG GPYSSVSDAS SVLDASQKSV FDKYKDNFTV TDQEIAVNEG FDRINDGQYR