ID   PSBU_SYNE7              Reviewed;         136 AA.
AC   Q31M07;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   06-DEC-2005, sequence version 1.
DT   03-AUG-2022, entry version 77.
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};
GN   OrderedLocusNames=Synpcc7942_1882;
OS   Synechococcus elongatus (strain PCC 7942 / FACHB-805) (Anacystis nidulans
OS   R2).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=1140;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7942 / FACHB-805;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T.,
RA   Hammon N., Israni S., Pitluck S., Schmutz J., Larimer F., Land M.,
RA   Kyrpides N., Lykidis A., Richardson P.;
RT   "Complete sequence of chromosome 1 of Synechococcus elongatus PCC 7942.";
RL   Submitted (AUG-2005) to the EMBL/GenBank/DDBJ databases.
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; CP000100; ABB57912.1; -; Genomic_DNA.
DR   RefSeq; WP_011244523.1; NC_007604.1.
DR   AlphaFoldDB; Q31M07; -.
DR   SMR; Q31M07; -.
DR   STRING; 1140.Synpcc7942_1882; -.
DR   PRIDE; Q31M07; -.
DR   EnsemblBacteria; ABB57912; ABB57912; Synpcc7942_1882.
DR   KEGG; syf:Synpcc7942_1882; -.
DR   eggNOG; COG1555; Bacteria.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   OMA; LLGCWGW; -.
DR   OrthoDB; 1626529at2; -.
DR   BioCyc; MetaCyc:SYNPCC7942_1882-MON; -.
DR   BioCyc; SYNEL:SYNPCC7942_1882-MON; -.
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..28
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00589"
FT   CHAIN           29..136
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_5000101192"
SQ   SEQUENCE   136 AA;  15066 MW;  5A489740BE0FA454 CRC64;
     MKQLAQRLFS LALVLALVLG ISVQSAQALS LQSPLLAVAE AEIRNEADAQ RIEAGGKLDL
     NNIGVRAFQQ FPGMYPYLAS KIVLGGPYDS VDDVLKLDLS DRQREVFEQY KENFTVTPPR
     DALNEGDDRI NNGIYR