ID   PSAJ_THEVL              Reviewed;          44 AA.
AC   P23075;
DT   01-NOV-1991, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2002, sequence version 2.
DT   23-FEB-2022, entry version 79.
DE   RecName: Full=Photosystem I reaction center subunit IX;
GN   Name=psaJ;
OS   Thermostichus vulcanus (Synechococcus vulcanus).
OC   Bacteria; Cyanobacteria; Thermostichales; Thermostichaceae; Thermostichus.
OX   NCBI_TaxID=32053;
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=2503399; DOI=10.1016/0014-5793(89)80971-8;
RA   Koike H., Ikeuchi M., Hiyama T., Inoue Y.;
RT   "Identification of photosystem I components from the cyanobacterium,
RT   Synechococcus vulcanus by N-terminal sequencing.";
RL   FEBS Lett. 253:257-263(1989).
CC   -!- FUNCTION: May help in the organization of the PsaE and PsaF subunits.
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   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   PANTHER; PTHR36082; PTHR36082; 1.
DR   Pfam; PF01701; PSI_PsaJ; 1.
DR   SUPFAM; SSF81544; SSF81544; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Membrane; Photosynthesis; Photosystem I;
KW   Thylakoid; Transmembrane; Transmembrane helix.
FT   CHAIN           1..44
FT                   /note="Photosystem I reaction center subunit IX"
FT                   /id="PRO_0000207827"
FT   TRANSMEM        7..27
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   44 AA;  5018 MW;  97B6E654A00F6D5A CRC64;
     MKHFLTYLST APVLALXXXX XXAGLLIEIN RFFPDALTFP FFSF