ID   PSBU_SYNS3              Reviewed;         125 AA.
AC   Q0I738;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   03-OCT-2006, sequence version 1.
DT   25-MAY-2022, entry version 80.
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=sync_2545;
OS   Synechococcus sp. (strain CC9311).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=64471;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CC9311;
RX   PubMed=16938853; DOI=10.1073/pnas.0602963103;
RA   Palenik B., Ren Q., Dupont C.L., Myers G.S., Heidelberg J.F., Badger J.H.,
RA   Madupu R., Nelson W.C., Brinkac L.M., Dodson R.J., Durkin A.S.,
RA   Daugherty S.C., Sullivan S.A., Khouri H., Mohamoud Y., Halpin R.,
RA   Paulsen I.T.;
RT   "Genome sequence of Synechococcus CC9311: insights into adaptation to a
RT   coastal environment.";
RL   Proc. Natl. Acad. Sci. U.S.A. 103:13555-13559(2006).
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}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; CP000435; ABI46544.1; -; Genomic_DNA.
DR   RefSeq; WP_011620439.1; NC_008319.1.
DR   AlphaFoldDB; Q0I738; -.
DR   SMR; Q0I738; -.
DR   STRING; 64471.sync_2545; -.
DR   EnsemblBacteria; ABI46544; ABI46544; sync_2545.
DR   KEGG; syg:sync_2545; -.
DR   eggNOG; COG1555; Bacteria.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   OMA; LLGCWGW; -.
DR   OrthoDB; 1626529at2; -.
DR   Proteomes; UP000001961; 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..29
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00589"
FT   CHAIN           30..125
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_0000295785"
SQ   SEQUENCE   125 AA;  13969 MW;  3C1EFA00EAD45BCA CRC64;
     MKRLLSWLTG LVVIAGLLIG LLVPPSVSAA EIRNVADDKL AERGDKVDLN NSSVRRFQQF
     PGMYPTFAGK IVLGGPYENV DDVLKLDLSE RQKELFEKYR DNFVVTAPSI ALNEGFDRIN
     DGQFR