ID   PETD_TETOB              Reviewed;         160 AA.
AC   P19586; Q1KVS3;
DT   01-FEB-1991, integrated into UniProtKB/Swiss-Prot.
DT   19-SEP-2006, sequence version 2.
DT   25-MAY-2022, entry version 99.
DE   RecName: Full=Cytochrome b6-f complex subunit 4 {ECO:0000255|HAMAP-Rule:MF_01344};
DE   AltName: Full=17 kDa polypeptide {ECO:0000255|HAMAP-Rule:MF_01344};
GN   Name=petD {ECO:0000255|HAMAP-Rule:MF_01344};
OS   Tetradesmus obliquus (Green alga) (Acutodesmus obliquus).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Chlorophyceae;
OC   CS clade; Sphaeropleales; Scenedesmaceae; Tetradesmus.
OX   NCBI_TaxID=3088;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=KS3/2;
RX   PubMed=2476655; DOI=10.1007/bf00331276;
RA   Kueck U.;
RT   "The intron of a plastid gene from a green alga contains an open reading
RT   frame for a reverse transcriptase-like enzyme.";
RL   Mol. Gen. Genet. 218:257-265(1989).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=UTEX 393;
RX   PubMed=9185572; DOI=10.1093/nar/25.13.2610;
RA   Turmel M., Otis C., Cote V., Lemieux C.;
RT   "Evolutionarily conserved and functionally important residues in the I-CeuI
RT   homing endonuclease.";
RL   Nucleic Acids Res. 25:2610-2619(1997).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=UTEX 393;
RX   PubMed=16638149; DOI=10.1186/1471-2148-6-37;
RA   de Cambiaire J.-C., Otis C., Lemieux C., Turmel M.;
RT   "The complete chloroplast genome sequence of the chlorophycean green alga
RT   Scenedesmus obliquus reveals a compact gene organization and a biased
RT   distribution of genes on the two DNA strands.";
RL   BMC Evol. Biol. 6:37-37(2006).
CC   -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates
CC       electron transfer between photosystem II (PSII) and photosystem I
CC       (PSI), cyclic electron flow around PSI, and state transitions.
CC       {ECO:0000255|HAMAP-Rule:MF_01344}.
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, petD), cytochrome f and
CC       the Rieske protein, while the 4 small subunits are petG, petL, petM and
CC       petN. The complex functions as a dimer (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_01344}; Multi-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_01344}.
CC   -!- SIMILARITY: Belongs to the cytochrome b family. PetD subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01344}.
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DR   EMBL; DQ396875; ABD48284.1; -; Genomic_DNA.
DR   RefSeq; YP_636001.1; NC_008101.1.
DR   AlphaFoldDB; P19586; -.
DR   SMR; P19586; -.
DR   GeneID; 4099775; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0045156; F:electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity; IEA:InterPro.
DR   GO; GO:0009767; P:photosynthetic electron transport chain; IEA:InterPro.
DR   CDD; cd00290; cytochrome_b_C; 1.
DR   HAMAP; MF_01344; Cytb6_f_subIV; 1.
DR   InterPro; IPR005798; Cyt_b/b6_C.
DR   InterPro; IPR036150; Cyt_b/b6_C_sf.
DR   InterPro; IPR005870; Cyt_b6/f_cplx_suIV.
DR   Pfam; PF00032; Cytochrom_B_C; 1.
DR   PIRSF; PIRSF000033; B6f_17K; 1.
DR   SUPFAM; SSF81648; SSF81648; 1.
DR   TIGRFAMs; TIGR01156; cytb6/f_IV; 1.
DR   PROSITE; PS51003; CYTB_CTER; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Electron transport; Membrane; Photosynthesis; Plastid;
KW   Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..160
FT                   /note="Cytochrome b6-f complex subunit 4"
FT                   /id="PRO_0000061890"
FT   TRANSMEM        36..56
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
FT   TRANSMEM        95..115
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
FT   TRANSMEM        131..151
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
FT   VARIANT         18
FT                   /note="L -> F (in strain: KS3/2)"
SQ   SEQUENCE   160 AA;  17541 MW;  5C26391FEA983AE9 CRC64;
     MSVTKKPDLT DPVLKEKLAK GMGHNYYGEP AWPNDLLYIF PVVILGTFAC VIGLSVLDPA
     AIGEPANPFA TPLEILPEWY FYPVFQLLRT VPNKLLGVLL MAAVPAGLIT VPFIENINKF
     QNPYRRPIAT TLFLVGTLVA VWLGIGATLP IEISLTFGLF