ID   PSBU_GRIJA              Reviewed;         153 AA.
AC   Q7XY82;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   25-MAY-2022, entry version 44.
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   Griffithsia japonica (Red alga).
OC   Eukaryota; Rhodophyta; Florideophyceae; Rhodymeniophycidae; Ceramiales;
OC   Ceramiaceae; Griffithsia.
OX   NCBI_TaxID=83288;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=Gj536;
RA   Liu C.L., Lee Y.K., Lee H.K.;
RT   "Gj536 Griffithsia japonica photosystem II 12 kDa extrinsic protein gene.";
RL   Submitted (JUN-2002) 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:0000250}.
CC   -!- SUBUNIT: The oxygen-evolving complex in red algae is composed of PsbO
CC       (OEC33), PsbQ', cytochrome c-550 and PsbU. {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: Predicted to be translocated into the thylakoid lumen by the Tat
CC       system. The position of the transit peptide cleavages have not been
CC       experimentally proven.
CC   -!- SIMILARITY: Belongs to the PsbU family. {ECO:0000305}.
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DR   EMBL; AF517880; AAP80721.1; -; mRNA.
DR   AlphaFoldDB; Q7XY82; -.
DR   SMR; Q7XY82; -.
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   InterPro; IPR006311; TAT_signal.
DR   Pfam; PF06514; PsbU; 1.
DR   PROSITE; PS51318; TAT; 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         ?..60
FT                   /note="Thylakoid"
FT                   /evidence="ECO:0000255"
FT   CHAIN           61..153
FT                   /note="Photosystem II 12 kDa extrinsic protein,
FT                   chloroplastic"
FT                   /id="PRO_0000295790"
SQ   SEQUENCE   153 AA;  16188 MW;  F981966F91EADC37 CRC64;
     MAFISGPALP TARVNRTVAA TPVRMASGED TPVVSRRALL SSTLAAAAAA LLSAAAPAKA
     DREYGNVGFL GGGDKIDVNN ANVRVYGRLP GMYPTLAGLI VANGPYKSVG DLYNIPGLDD
     KQTGLLKKYE DSFVALEPRP EYEIDKFNNG LYR