ID   PSBU_KARBR              Reviewed;         159 AA.
AC   Q00GL7;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   14-NOV-2006, sequence version 1.
DT   03-AUG-2022, entry version 41.
DE   RecName: Full=Photosystem II 12 kDa extrinsic protein, chloroplastic;
DE   AltName: Full=PS II complex 12 kDa extrinsic protein;
DE   AltName: Full=PSII-U;
DE   Flags: Precursor;
GN   Name=psbU;
OS   Karenia brevis (Red tide dinoflagellate) (Gymnodinium breve).
OC   Eukaryota; Sar; Alveolata; Dinophyceae; Gymnodiniales; Kareniaceae;
OC   Karenia.
OX   NCBI_TaxID=156230;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=Wilson;
RX   PubMed=16877498; DOI=10.1093/molbev/msl074;
RA   Nosenko T., Lidie K.L., Van Dolah F.M., Lindquist E., Cheng J.-F.,
RA   Bhattacharya D.;
RT   "Chimeric plastid proteome in the Florida 'red tide' dinoflagellate Karenia
RT   brevis.";
RL   Mol. Biol. Evol. 23:2026-2038(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:0000250}.
CC   -!- SUBUNIT: Part of the oxygen-evolving complex of photosystem II.
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Peripheral membrane protein {ECO:0000250}; Lumenal side
CC       {ECO:0000250}. Note=Associated with photosystem II at the lumenal side
CC       of the thylakoid membrane. {ECO:0000250}.
CC   -!- PTM: Might be translocated into the thylakoid lumen by the Tat system.
CC       The position of the signal and transit peptide cleavages have not been
CC       experimentally proven.
CC   -!- SIMILARITY: Belongs to the PsbU family. {ECO:0000305}.
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DR   EMBL; DQ531591; ABF73018.1; -; mRNA.
DR   AlphaFoldDB; Q00GL7; -.
DR   SMR; Q00GL7; -.
DR   PRIDE; Q00GL7; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
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: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   2: Evidence at transcript level;
KW   Chloroplast; Electron transport; Membrane; Photosynthesis; Photosystem II;
KW   Plastid; Thylakoid; Transit peptide; Transport.
FT   TRANSIT         1..?
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255"
FT   TRANSIT         ?..64
FT                   /note="Thylakoid"
FT                   /evidence="ECO:0000255"
FT   CHAIN           65..159
FT                   /note="Photosystem II 12 kDa extrinsic protein,
FT                   chloroplastic"
FT                   /id="PRO_0000295791"
SQ   SEQUENCE   159 AA;  17277 MW;  605E5E8489EF1FEE CRC64;
     MQKMAMLMAC LACMGLAAAF SPATLGVNKP SHRQQAPVMS QVARRELLSK VLGAAALLGA
     ASADAKVNYD AVAYLGGAQQ IDVNNANIRV YQKLPGMYPS AAGKLCTNGP YVDLKDMYAK
     AKLSKEEEAI VKEFDKDFLF LKPQIEYVVD NLNNGLYRR