ID   PSBU_TRIV2              Reviewed;         142 AA.
AC   Q3MFH7;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   24-JUL-2007, sequence version 2.
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}; OrderedLocusNames=Ava_0635;
OS   Trichormus variabilis (strain ATCC 29413 / PCC 7937) (Anabaena variabilis).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Trichormus.
OX   NCBI_TaxID=240292;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29413 / PCC 7937;
RX   PubMed=25197444; DOI=10.4056/sigs.3899418;
RA   Thiel T., Pratte B.S., Zhong J., Goodwin L., Copeland A., Lucas S., Han C.,
RA   Pitluck S., Land M.L., Kyrpides N.C., Woyke T.;
RT   "Complete genome sequence of Anabaena variabilis ATCC 29413.";
RL   Stand. Genomic Sci. 9:562-573(2014).
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   -!- SEQUENCE CAUTION:
CC       Sequence=ABA20259.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CP000117; ABA20259.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; Q3MFH7; -.
DR   SMR; Q3MFH7; -.
DR   STRING; 240292.Ava_0635; -.
DR   EnsemblBacteria; ABA20259; ABA20259; Ava_0635.
DR   KEGG; ava:Ava_0635; -.
DR   eggNOG; COG1555; Bacteria.
DR   HOGENOM; CLU_141240_1_0_3; -.
DR   Proteomes; UP000002533; 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..142
FT                   /note="Photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_5000103834"
SQ   SEQUENCE   142 AA;  15820 MW;  731CEA017E231D81 CRC64;
     MKGLVRLLTV FSLLLGCWGW LGTTQIAQAG SLQSFLVPQV PVLAIESQNR ADAKLATEFG
     KKIDLNNTNV RAFQQYPGLY PTLARKIIQN APYSKVEDVL DLPGLSDGQK QLLQSNFDKF
     TVTELEPAFN EGDDRFNNGI YR