ID   PSAJ_MASLA              Reviewed;          45 AA.
AC   O31128;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1998, sequence version 1.
DT   25-MAY-2022, entry version 76.
DE   RecName: Full=Photosystem I reaction center subunit IX;
GN   Name=psaJ;
OS   Mastigocladus laminosus (Fischerella sp.).
OC   Bacteria; Cyanobacteria; Nostocales; Hapalosiphonaceae; Mastigocladus.
OX   NCBI_TaxID=83541;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=PCC 7605;
RA   He Z.-Y., Chitnis V.P., Chitnis P.R., Nechushtai R.;
RT   "Molecular cloning of the psaF and psaJ genes of photosystem I from the
RT   thermophilic cyanobacterium Mastigocladus laminosus.";
RL   (er) Plant Gene Register PGR98-026(1998).
CC   -!- FUNCTION: May help in the organization of the PsaE and PsaF subunits.
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Single-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaJ family. {ECO:0000305}.
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DR   EMBL; AF030004; AAC04843.1; -; Genomic_DNA.
DR   AlphaFoldDB; O31128; -.
DR   SMR; O31128; -.
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_00522; PSI_PsaJ; 1.
DR   InterPro; IPR002615; PSI_PsaJ.
DR   InterPro; IPR036062; PSI_PsaJ_sf.
DR   Pfam; PF01701; PSI_PsaJ; 1.
DR   SUPFAM; SSF81544; SSF81544; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem I; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..45
FT                   /note="Photosystem I reaction center subunit IX"
FT                   /id="PRO_0000207821"
FT   TRANSMEM        10..30
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   45 AA;  5202 MW;  9B33538512A02437 CRC64;
     MNNQSPLLKF LTTAPVITTI WLFITAGILI EFNRFFPDLL FHPLP