PSBI_SYNY3
ID PSBI_SYNY3 Reviewed; 38 AA.
AC Q54697;
DT 01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1996, sequence version 1.
DT 03-AUG-2022, entry version 119.
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 4.4 kDa protein {ECO:0000255|HAMAP-Rule:MF_01316};
GN Name=psbI {ECO:0000255|HAMAP-Rule:MF_01316}; OrderedLocusNames=sml0001;
OS Synechocystis sp. (strain PCC 6803 / Kazusa).
OC Bacteria; Cyanobacteria; Synechococcales; Merismopediaceae; Synechocystis;
OC unclassified Synechocystis.
OX NCBI_TaxID=1111708;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA], DISRUPTION PHENOTYPE, AND FUNCTION.
RX PubMed=8544827; DOI=10.1007/bf00418031;
RA Ikeuchi M., Shukla V.K., Pakrasi H.B., Inoue Y.;
RT "Directed inactivation of the psbI gene does not affect photosystem II in
RT the cyanobacterium Synechocystis sp. PCC 6803.";
RL Mol. Gen. Genet. 249:622-628(1995).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 27184 / PCC 6803 / N-1;
RX PubMed=8590279; DOI=10.1093/dnares/2.4.153;
RA Kaneko T., Tanaka A., Sato S., Kotani H., Sazuka T., Miyajima N.,
RA Sugiura M., Tabata S.;
RT "Sequence analysis of the genome of the unicellular cyanobacterium
RT Synechocystis sp. strain PCC6803. I. Sequence features in the 1 Mb region
RT from map positions 64% to 92% of the genome.";
RL DNA Res. 2:153-166(1995).
RN [3]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=PCC 6803 / Kazusa;
RX PubMed=8905231; DOI=10.1093/dnares/3.3.109;
RA Kaneko T., Sato S., Kotani H., Tanaka A., Asamizu E., Nakamura Y.,
RA Miyajima N., Hirosawa M., Sugiura M., Sasamoto S., Kimura T., Hosouchi T.,
RA Matsuno A., Muraki A., Nakazaki N., Naruo K., Okumura S., Shimpo S.,
RA Takeuchi C., Wada T., Watanabe A., Yamada M., Yasuda M., Tabata S.;
RT "Sequence analysis of the genome of the unicellular cyanobacterium
RT Synechocystis sp. strain PCC6803. II. Sequence determination of the entire
RT genome and assignment of potential protein-coding regions.";
RL DNA Res. 3:109-136(1996).
RN [4]
RP PROTEIN SEQUENCE OF 1-8, SUBUNIT, AND SUBCELLULAR LOCATION.
RC STRAIN=PCC 6803 / Kazusa;
RX PubMed=12069591; DOI=10.1021/bi026012+;
RA Kashino Y., Lauber W.M., Carroll J.A., Wang Q., Whitmarsh J., Satoh K.,
RA Pakrasi H.B.;
RT "Proteomic analysis of a highly active photosystem II preparation from the
RT cyanobacterium Synechocystis sp. PCC 6803 reveals the presence of novel
RT polypeptides.";
RL Biochemistry 41:8004-8012(2002).
RN [5]
RP FUNCTION, SUBUNIT, SUBCELLULAR LOCATION, AND DISRUPTION PHENOTYPE.
RC STRAIN=PCC 6803-G;
RX PubMed=17921338; DOI=10.1104/pp.107.107805;
RA Dobakova M., Tichy M., Komenda J.;
RT "Role of the PsbI protein in photosystem II assembly and repair in the
RT cyanobacterium Synechocystis sp. PCC 6803.";
RL Plant Physiol. 145:1681-1691(2007).
CC -!- FUNCTION: One of the components of the core complex of photosystem II
CC (PSII) (PubMed:8544827). Not essential for assembly, it probably binds
CC to D1 early in the assembly of PSII and stabilizes binding of CP43
CC (psbC) to the reaction center (PubMed:17921338). PSII is a light-driven
CC water:plastoquinone oxidoreductase that uses light energy to abstract
CC electrons from H(2)O, generating O(2) and a proton gradient
CC subsequently used for ATP formation. It consists of a core antenna
CC complex that captures photons, and an electron transfer chain that
CC converts photonic excitation into a charge separation.
CC {ECO:0000255|HAMAP-Rule:MF_01316, ECO:0000269|PubMed:17921338,
CC ECO:0000269|PubMed:8544827}.
CC -!- SUBUNIT: Cyanobacterial PSII is composed of 1 copy each of membrane
CC proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK,
CC PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral
CC proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms
CC dimeric complexes. {ECO:0000255|HAMAP-Rule:MF_01316,
CC ECO:0000269|PubMed:12069591, ECO:0000269|PubMed:17921338}.
CC -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC Rule:MF_01316, ECO:0000269|PubMed:12069591,
CC ECO:0000269|PubMed:17921338}; Single-pass membrane protein
CC {ECO:0000255|HAMAP-Rule:MF_01316, ECO:0000305|PubMed:17921338}.
CC -!- DISRUPTION PHENOTYPE: Loss of about 25% of PSII activity, cells are
CC slightly more photosensitive (PubMed:8544827, PubMed:17921338). Altered
CC assembly of PSII, with destabilized binding of CP43 (psbC)
CC (PubMed:17921338). {ECO:0000269|PubMed:17921338,
CC ECO:0000269|PubMed:8544827}.
CC -!- SIMILARITY: Belongs to the PsbI family. {ECO:0000255|HAMAP-
CC Rule:MF_01316}.
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DR EMBL; U28040; AAC43720.1; -; Genomic_DNA.
DR EMBL; BA000022; BAA10085.1; -; Genomic_DNA.
DR PIR; S76107; S76107.
DR PDB; 6WJ6; EM; 2.58 A; I=1-38.
DR PDB; 7N8O; EM; 1.93 A; I/i=1-38.
DR PDB; 7RCV; EM; 2.01 A; I/i=1-38.
DR PDBsum; 6WJ6; -.
DR PDBsum; 7N8O; -.
DR PDBsum; 7RCV; -.
DR AlphaFoldDB; Q54697; -.
DR SMR; Q54697; -.
DR IntAct; Q54697; 1.
DR STRING; 1148.1673335; -.
DR PaxDb; Q54697; -.
DR EnsemblBacteria; BAA10085; BAA10085; BAA10085.
DR KEGG; syn:sml0001; -.
DR eggNOG; ENOG5033CII; Bacteria.
DR InParanoid; Q54697; -.
DR BioCyc; MetaCyc:PSBI-MON; -.
DR Proteomes; UP000001425; Chromosome.
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:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0030096; C:plasma membrane-derived thylakoid photosystem II; IDA:UniProtKB.
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 1: Evidence at protein level;
KW 3D-structure; Direct protein sequencing; Membrane; Photosynthesis;
KW Photosystem II; Reaction center; Reference proteome; Thylakoid;
KW Transmembrane; Transmembrane helix.
FT CHAIN 1..38
FT /note="Photosystem II reaction center protein I"
FT /id="PRO_0000219663"
FT TRANSMEM 6..26
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01316"
FT HELIX 2..24
FT /evidence="ECO:0007829|PDB:7N8O"
FT HELIX 27..29
FT /evidence="ECO:0007829|PDB:7N8O"
FT STRAND 30..33
FT /evidence="ECO:0007829|PDB:7N8O"
SQ SEQUENCE 38 AA; 4306 MW; D1AADF4A59338CD0 CRC64;
MLTLKIAVYI VVGLFISLFI FGFLSSDPTR NPGRKDFE
