ID   PSBU_SYNR3              Reviewed;         127 AA.
AC   A5GQP8;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   12-JUN-2007, sequence version 1.
DT   25-MAY-2022, entry version 70.
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=SynRCC307_0304;
OS   Synechococcus sp. (strain RCC307).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=316278;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=RCC307;
RG   Genoscope;
RL   Submitted (MAY-2006) 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:0000255|HAMAP-Rule:MF_00589}.
CC   -!- SIMILARITY: Belongs to the PsbU family. {ECO:0000255|HAMAP-
CC       Rule:MF_00589}.
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DR   EMBL; CT978603; CAK27207.1; -; Genomic_DNA.
DR   RefSeq; WP_011934722.1; NC_009482.1.
DR   AlphaFoldDB; A5GQP8; -.
DR   SMR; A5GQP8; -.
DR   STRING; 316278.SynRCC307_0304; -.
DR   EnsemblBacteria; CAK27207; CAK27207; SynRCC307_0304.
DR   KEGG; syr:SynRCC307_0304; -.
DR   eggNOG; COG1555; Bacteria.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   OMA; LLGCWGW; -.
DR   OrthoDB; 1626529at2; -.
DR   Proteomes; UP000001115; 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;
KW   Reference proteome; Signal; Thylakoid; Transport.
FT   SIGNAL          1..31
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00589"
FT   CHAIN           32..127
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_1000025487"
SQ   SEQUENCE   127 AA;  14495 MW;  532BE8BDCC136212 CRC64;
     MSRLFRRLST LLLCSLLVLG VWLTQPLSVQ AAEIRNKVDD KIAETAGKVD LNNASVRRFQ
     QYPGMYPTLA GKIVVGGPYD QVEDVLKLDL TERQKELFEK YKENFTVTDP EIALNEGFDR
     INDGQYR