ID   PSAI_SYNY3              Reviewed;          40 AA.
AC   Q55330;
DT   01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   03-AUG-2022, entry version 128.
DE   RecName: Full=Photosystem I reaction center subunit VIII;
GN   Name=psaI; OrderedLocusNames=smr0004;
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].
RX   PubMed=7608190; DOI=10.1074/jbc.270.27.16243;
RA   Xu Q., Hoppe D., Chitnis V.P., Odom W.R., Guikema J.A., Chitnis P.R.;
RT   "Mutational analysis of photosystem I polypeptides in the cyanobacterium
RT   Synechocystis sp. PCC 6803. Targeted inactivation of psaI reveals the
RT   function of psaI in the structural organization of psaL.";
RL   J. Biol. Chem. 270:16243-16250(1995).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=8589933;
RA   Nakamoto H.;
RT   "Targeted inactivation of the gene psaI encoding a subunit of photosystem I
RT   of the cyanobacterium Synechocystis sp. PCC 6803.";
RL   Plant Cell Physiol. 36:1579-1587(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).
CC   -!- FUNCTION: May help in the organization of the PsaL subunit.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Single-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaI family. {ECO:0000305}.
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DR   EMBL; L24773; AAA99435.1; -; Genomic_DNA.
DR   EMBL; D38131; BAA19609.1; -; Genomic_DNA.
DR   EMBL; BA000022; BAA18774.1; -; Genomic_DNA.
DR   PIR; A57482; A57482.
DR   PDB; 4L6V; X-ray; 3.80 A; 9/I/i=1-40.
DR   PDB; 5OY0; X-ray; 2.50 A; I/i=1-40, h=1-38.
DR   PDB; 6HQB; X-ray; 4.00 A; I=1-40.
DR   PDB; 6NWA; EM; 3.48 A; I/R/i=1-40.
DR   PDB; 6UZV; EM; 3.10 A; I/h/i=1-40.
DR   PDBsum; 4L6V; -.
DR   PDBsum; 5OY0; -.
DR   PDBsum; 6HQB; -.
DR   PDBsum; 6NWA; -.
DR   PDBsum; 6UZV; -.
DR   AlphaFoldDB; Q55330; -.
DR   SMR; Q55330; -.
DR   IntAct; Q55330; 4.
DR   STRING; 1148.1653864; -.
DR   PaxDb; Q55330; -.
DR   EnsemblBacteria; BAA18774; BAA18774; BAA18774.
DR   KEGG; syn:smr0004; -.
DR   eggNOG; ENOG5033AVJ; Bacteria.
DR   InParanoid; Q55330; -.
DR   BioCyc; MetaCyc:PSAI-MON; -.
DR   Proteomes; UP000001425; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009522; C:photosystem I; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_00431; PSI_PsaI; 1.
DR   InterPro; IPR001302; PSI_PsaI.
DR   InterPro; IPR036357; PSI_PsaI_sf.
DR   PANTHER; PTHR35775; PTHR35775; 1.
DR   Pfam; PF00796; PSI_8; 1.
DR   SUPFAM; SSF81540; SSF81540; 1.
DR   TIGRFAMs; TIGR03052; PS_I_psaI; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Membrane; Photosynthesis; Photosystem I; Reference proteome;
KW   Thylakoid; Transmembrane; Transmembrane helix.
FT   CHAIN           1..40
FT                   /note="Photosystem I reaction center subunit VIII"
FT                   /id="PRO_0000194685"
FT   TRANSMEM        12..32
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TURN            6..8
FT                   /evidence="ECO:0007829|PDB:5OY0"
FT   HELIX           9..19
FT                   /evidence="ECO:0007829|PDB:5OY0"
FT   HELIX           21..34
FT                   /evidence="ECO:0007829|PDB:5OY0"
SQ   SEQUENCE   40 AA;  4413 MW;  DAD8CA06B0420372 CRC64;
     MDGSYAASYL PWILIPMVGW LFPAVTMGLL FIHIESEGEG