ID   PSAD_SYNP6              Reviewed;         142 AA.
AC   P23076; Q5N4N6;
DT   01-NOV-1991, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 3.
DT   25-MAY-2022, entry version 101.
DE   RecName: Full=Photosystem I reaction center subunit II;
DE   AltName: Full=Photosystem I 16 kDa polypeptide;
DE            Short=PSI-D;
GN   Name=psaD; OrderedLocusNames=syc0543_c;
OS   Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1) (Anacystis
OS   nidulans).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=269084;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27144 / PCC 6301 / SAUG 1402/1;
RX   PubMed=17211581; DOI=10.1007/s11120-006-9122-4;
RA   Sugita C., Ogata K., Shikata M., Jikuya H., Takano J., Furumichi M.,
RA   Kanehisa M., Omata T., Sugiura M., Sugita M.;
RT   "Complete nucleotide sequence of the freshwater unicellular cyanobacterium
RT   Synechococcus elongatus PCC 6301 chromosome: gene content and
RT   organization.";
RL   Photosyn. Res. 93:55-67(2007).
RN   [2]
RP   PROTEIN SEQUENCE OF 2-99.
RA   Alhadeff M., Lundell D.J., Glazer A.N.;
RT   "Structural studies on cyanobacterial photosystem I. Purification and
RT   characterization of two low molecular weight polypeptides.";
RL   Arch. Microbiol. 150:482-488(1988).
RN   [3]
RP   PROTEIN SEQUENCE OF 2-25.
RX   PubMed=1653017; DOI=10.1016/s0005-2728(05)80206-3;
RA   Li N., Warren P.V., Golbeck J.H., Frank G., Zuber H., Bryant D.A.;
RT   "Polypeptide composition of the Photosystem I complex and the Photosystem I
RT   core protein from Synechococcus sp. PCC 6301.";
RL   Biochim. Biophys. Acta 1059:215-225(1991).
CC   -!- FUNCTION: PsaD can form complexes with ferredoxin and ferredoxin-
CC       oxidoreductase in photosystem I (PS I) reaction center.
CC   -!- SIMILARITY: Belongs to the PsaD family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=BAD78733.1; Type=Frameshift; Evidence={ECO:0000305};
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DR   EMBL; AP008231; BAD78733.1; ALT_FRAME; Genomic_DNA.
DR   AlphaFoldDB; P23076; -.
DR   SMR; P23076; -.
DR   EnsemblBacteria; BAD78733; BAD78733; syc0543_c.
DR   KEGG; syc:syc0543_c; -.
DR   eggNOG; ENOG502ZBN6; Bacteria.
DR   Proteomes; UP000001175; Chromosome.
DR   GO; GO:0009538; C:photosystem I reaction center; IEA:InterPro.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   InterPro; IPR003685; PsaD.
DR   InterPro; IPR036579; PsaD_sf.
DR   PANTHER; PTHR31982; PTHR31982; 1.
DR   Pfam; PF02531; PsaD; 1.
DR   SUPFAM; SSF64234; SSF64234; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Photosynthesis; Photosystem I.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|PubMed:1653017, ECO:0000269|Ref.2"
FT   CHAIN           2..142
FT                   /note="Photosystem I reaction center subunit II"
FT                   /id="PRO_0000206053"
FT   REGION          119..142
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        128..142
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   CONFLICT        88..89
FT                   /note="RF -> DV (in Ref. 2; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        93
FT                   /note="A -> G (in Ref. 2; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        96
FT                   /note="G -> E (in Ref. 2; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        99
FT                   /note="H -> K (in Ref. 2; AA sequence)"
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   142 AA;  15636 MW;  7052C5659C81FDCB CRC64;
     MAETLTGKTP VFGGSTGGLL KSAETEEKYA ITWTSTKEQV FELPTGGAAV MHEGDNLLYF
     ARKEQALALG TQLRTKFKPK IESYKIYRFF PGADVGYLHP KDGVFPEKVN EGRSFAGKVD
     RRIGQNPNPA TIKFTGKQPY TA