ID   PSAI_NOSS1              Reviewed;          46 AA.
AC   P58560;
DT   23-JAN-2002, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2002, sequence version 1.
DT   25-MAY-2022, entry version 104.
DE   RecName: Full=Photosystem I reaction center subunit VIII;
DE   Flags: Precursor;
GN   Name=psaI; OrderedLocusNames=asl3849;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
RN   [2]
RP   PROTEIN SEQUENCE OF 12-21, SUBUNIT, AND SUBCELLULAR LOCATION.
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=24550276; DOI=10.1073/pnas.1320599111;
RA   Watanabe M., Semchonok D.A., Webber-Birungi M.T., Ehira S., Kondo K.,
RA   Narikawa R., Ohmori M., Boekema E.J., Ikeuchi M.;
RT   "Attachment of phycobilisomes in an antenna-photosystem I supercomplex of
RT   cyanobacteria.";
RL   Proc. Natl. Acad. Sci. U.S.A. 111:2512-2517(2014).
CC   -!- FUNCTION: May help in the organization of the PsaL subunit.
CC       {ECO:0000250}.
CC   -!- SUBUNIT: The cyanobacterial PSI reaction center is composed of one copy
CC       each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms dimeric and
CC       tetrameric complexes. {ECO:0000269|PubMed:24550276}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC       {ECO:0000269|PubMed:24550276}; Single-pass membrane protein
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaI family. {ECO:0000305}.
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DR   EMBL; BA000019; BAB75548.1; -; Genomic_DNA.
DR   PIR; AB2287; AB2287.
DR   RefSeq; WP_010997990.1; NZ_RSCN01000011.1.
DR   PDB; 6JEO; EM; 3.30 A; aI/bI/cI/dI=1-46.
DR   PDB; 6K61; EM; 2.37 A; I/i=1-46.
DR   PDB; 6TCL; EM; 3.20 A; I/I1/II=13-43, I2=13-45.
DR   PDBsum; 6JEO; -.
DR   PDBsum; 6K61; -.
DR   PDBsum; 6TCL; -.
DR   AlphaFoldDB; P58560; -.
DR   SMR; P58560; -.
DR   STRING; 103690.17132983; -.
DR   EnsemblBacteria; BAB75548; BAB75548; BAB75548.
DR   KEGG; ana:asl3849; -.
DR   eggNOG; ENOG5030M43; Bacteria.
DR   OrthoDB; 2080108at2; -.
DR   Proteomes; UP000002483; 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   Pfam; PF00796; PSI_8; 1.
DR   SUPFAM; SSF81540; SSF81540; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Direct protein sequencing; Membrane; Photosynthesis;
KW   Photosystem I; Reference proteome; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   PROPEP          1..11
FT                   /id="PRO_0000029420"
FT   CHAIN           12..46
FT                   /note="Photosystem I reaction center subunit VIII"
FT                   /id="PRO_0000029421"
FT   TRANSMEM        20..40
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   HELIX           14..16
FT                   /evidence="ECO:0007829|PDB:6K61"
FT   HELIX           17..25
FT                   /evidence="ECO:0007829|PDB:6K61"
FT   HELIX           27..40
FT                   /evidence="ECO:0007829|PDB:6K61"
SQ   SEQUENCE   46 AA;  5066 MW;  4EDBCA05972D0AA9 CRC64;
     MATAFLPSIL ADASFLSSIF VPVIGWVVPI ATFSFLFLYI EREDVA