ID   PSBU_SYNSC              Reviewed;         135 AA.
AC   Q3AH66;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   22-NOV-2005, sequence version 1.
DT   25-MAY-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=Syncc9605_2334;
OS   Synechococcus sp. (strain CC9605).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=110662;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CC9605;
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., Martinez M., Larimer F.,
RA   Land M., Kyrpides N., Ivanova N., Richardson P.;
RT   "Complete sequence of Synechococcus sp. CC9605.";
RL   Submitted (JUL-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; CP000110; ABB36066.1; -; Genomic_DNA.
DR   RefSeq; WP_011365264.1; NC_007516.1.
DR   AlphaFoldDB; Q3AH66; -.
DR   SMR; Q3AH66; -.
DR   STRING; 110662.Syncc9605_2334; -.
DR   EnsemblBacteria; ABB36066; ABB36066; Syncc9605_2334.
DR   KEGG; syd:Syncc9605_2334; -.
DR   eggNOG; COG1555; Bacteria.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   OMA; PTMAGKI; -.
DR   OrthoDB; 1626529at2; -.
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..135
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_5000102464"
SQ   SEQUENCE   135 AA;  15082 MW;  EFD837B84843804F CRC64;
     MKRLLSWLTG ALVMASLMAG LVMPSSVYAD DDLRNKYSGN EIRNIADDKI AARDGKVDLN
     NSSVRRFQQF PGMYPTMAGK IVLGGPYDSV DDVLSLDLTE RQQELFAKYR DNFTVTPPSI
     ALNEGDDRIN DGQYR