ID   PSBI_TOBAC              Reviewed;          36 AA.
AC   P62102; P09970; Q3HKB3;
DT   21-JUN-2004, integrated into UniProtKB/Swiss-Prot.
DT   21-JUN-2004, sequence version 1.
DT   25-MAY-2022, entry version 50.
DE   RecName: Full=Photosystem II reaction center protein I {ECO:0000255|HAMAP-Rule:MF_01316};
DE            Short=PSII-I {ECO:0000255|HAMAP-Rule:MF_01316};
DE   AltName: Full=PSII 4.8 kDa protein {ECO:0000255|HAMAP-Rule:MF_01316};
GN   Name=psbI {ECO:0000255|HAMAP-Rule:MF_01316};
OS   Nicotiana tabacum (Common tobacco).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Nicotianoideae; Nicotianeae;
OC   Nicotiana.
OX   NCBI_TaxID=4097;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. Bright Yellow 4;
RX   PubMed=16453699; DOI=10.1002/j.1460-2075.1986.tb04464.x;
RA   Shinozaki K., Ohme M., Tanaka M., Wakasugi T., Hayashida N.,
RA   Matsubayashi T., Zaita N., Chunwongse J., Obokata J.,
RA   Yamaguchi-Shinozaki K., Ohto C., Torazawa K., Meng B.-Y., Sugita M.,
RA   Deno H., Kamogashira T., Yamada K., Kusuda J., Takaiwa F., Kato A.,
RA   Tohdoh N., Shimada H., Sugiura M.;
RT   "The complete nucleotide sequence of the tobacco chloroplast genome: its
RT   gene organization and expression.";
RL   EMBO J. 5:2043-2049(1986).
RN   [2]
RP   FUNCTION, AND DISRUPTION PHENOTYPE.
RC   STRAIN=cv. Petit Havana;
RX   PubMed=16920705; DOI=10.1074/jbc.m604888200;
RA   Schwenkert S., Umate P., Dal Bosco C., Volz S., Mlcochova L., Zoryan M.,
RA   Eichacker L.A., Ohad I., Herrmann R.G., Meurer J.;
RT   "PsbI affects the stability, function, and phosphorylation patterns of
RT   photosystem II assemblies in tobacco.";
RL   J. Biol. Chem. 281:34227-34238(2006).
CC   -!- FUNCTION: One of the components of the core complex of photosystem II
CC       (PSII), required for the stability, but not for the assembly of dimeric
CC       PSII and PSII-outer antenna supercomplexes (PSII-LHCII), and for
CC       assembly of the functional Q(A)-binding site (PubMed:16920705). PSII is
CC       a light-driven water:plastoquinone oxidoreductase that uses light
CC       energy to abstract electrons from H(2)O, generating O(2) and a proton
CC       gradient subsequently used for ATP formation. It consists of a core
CC       antenna complex that captures photons, and an electron transfer chain
CC       that converts photonic excitation into a charge separation.
CC       {ECO:0000255|HAMAP-Rule:MF_01316, ECO:0000269|PubMed:16920705}.
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC       PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins of the oxygen-
CC       evolving complex and a large number of cofactors. It forms dimeric
CC       complexes. {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_01316}; Single-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_01316}.
CC   -!- DISRUPTION PHENOTYPE: Able to grow under greenhouse conditions,
CC       increased sensitivity to high light. Able to assemble dimeric PSII and
CC       PSII-LHCII complexes, but they are not stable. Almost complete loss of
CC       phosphorylation of D1, D2 and CP43 (PsbA, PsbD and PsbC respectively),
CC       altered phosphorylation of LHCII. {ECO:0000269|PubMed:16920705}.
CC   -!- SIMILARITY: Belongs to the PsbI family. {ECO:0000255|HAMAP-
CC       Rule:MF_01316}.
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DR   EMBL; Z00044; CAJ32478.1; -; Genomic_DNA.
DR   PIR; S05608; F2NTI.
DR   AlphaFoldDB; P62102; -.
DR   SMR; P62102; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_01316; PSII_PsbI; 1.
DR   InterPro; IPR003686; PSII_PsbI.
DR   InterPro; IPR037271; PSII_PsbI_sf.
DR   PANTHER; PTHR35772; PTHR35772; 1.
DR   Pfam; PF02532; PsbI; 1.
DR   SUPFAM; SSF161041; SSF161041; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Membrane; Photosynthesis; Photosystem II; Plastid;
KW   Reaction center; Thylakoid; Transmembrane; Transmembrane helix.
FT   CHAIN           1..36
FT                   /note="Photosystem II reaction center protein I"
FT                   /id="PRO_0000219657"
FT   TRANSMEM        4..24
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01316"
SQ   SEQUENCE   36 AA;  4168 MW;  6B6C7FCB57BB6236 CRC64;
     MLTLKLFVYT VVIFFVSLFI FGFLSNDPGR NPGREE