ID   PSBU_GLOVI              Reviewed;         158 AA.
AC   Q7NCV3;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   15-DEC-2003, sequence version 1.
DT   03-AUG-2022, entry version 75.
DE   RecName: Full=Putative photosystem II 12 kDa extrinsic protein;
DE   AltName: Full=PS II complex 12 kDa extrinsic protein;
DE   AltName: Full=PSII-U;
DE   Flags: Precursor;
GN   Name=psbU; OrderedLocusNames=gll2873;
OS   Gloeobacter violaceus (strain ATCC 29082 / PCC 7421).
OC   Bacteria; Cyanobacteria; Gloeobacteria; Gloeobacterales; Gloeobacteraceae;
OC   Gloeobacter.
OX   NCBI_TaxID=251221;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29082 / PCC 7421;
RX   PubMed=14621292; DOI=10.1093/dnares/10.4.137;
RA   Nakamura Y., Kaneko T., Sato S., Mimuro M., Miyashita H., Tsuchiya T.,
RA   Sasamoto S., Watanabe A., Kawashima K., Kishida Y., Kiyokawa C., Kohara M.,
RA   Matsumoto M., Matsuno A., Nakazaki N., Shimpo S., Takeuchi C., Yamada M.,
RA   Tabata S.;
RT   "Complete genome structure of Gloeobacter violaceus PCC 7421, a
RT   cyanobacterium that lacks thylakoids.";
RL   DNA Res. 10:137-145(2003).
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:0000305}.
CC   -!- SUBUNIT: With PsbO,P,Q and V forms the oxygen-evolving complex of
CC       photosystem II. {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000305}; Peripheral
CC       membrane protein {ECO:0000305}; Lumenal side {ECO:0000305}.
CC       Note=Associated with photosystem II at the extracellular side of the
CC       inner membrane. {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the PsbU family. {ECO:0000305}.
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DR   EMBL; BA000045; BAC90814.1; -; Genomic_DNA.
DR   RefSeq; NP_925819.1; NC_005125.1.
DR   RefSeq; WP_011142867.1; NC_005125.1.
DR   AlphaFoldDB; Q7NCV3; -.
DR   SMR; Q7NCV3; -.
DR   EnsemblBacteria; BAC90814; BAC90814; BAC90814.
DR   KEGG; gvi:gll2873; -.
DR   PATRIC; fig|251221.4.peg.2903; -.
DR   HOGENOM; CLU_1935050_0_0_3; -.
DR   OrthoDB; 1626529at2; -.
DR   Proteomes; UP000000557; 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:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   GO; GO:0042549; P:photosystem II stabilization; IEA:InterPro.
DR   InterPro; IPR010527; PSII_PsbU.
DR   Pfam; PF06514; PsbU; 1.
PE   3: Inferred from homology;
KW   Cell inner membrane; Cell membrane; Electron transport; Membrane;
KW   Photosynthesis; Photosystem II; Reference proteome; Signal; Transport.
FT   SIGNAL          1..27
FT                   /evidence="ECO:0000255"
FT   CHAIN           28..158
FT                   /note="Putative photosystem II 12 kDa extrinsic protein"
FT                   /id="PRO_0000295783"
FT   REGION          27..94
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        27..49
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        50..85
FT                   /note="Pro residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   158 AA;  16300 MW;  E0C60887D4F293FA CRC64;
     MQEHIRKISA LVLSGAVCMG MGTAVLAQSS PSPSGTYQPG DKTNQVPPTT TTPEPGPAGT
     PPSPSSPYGA PAQPSTTPPS STSPSTTPAP TARTIDLNAV TSAQLVRAGL DEPSAKLIEQ
     NQPYTKPEDV LQVQGLSEQT KAALKANMDI LRANPKMK