ID   PETD_LACSA              Reviewed;         160 AA.
AC   Q332U6; Q1KXJ1;
DT   24-JAN-2006, integrated into UniProtKB/Swiss-Prot.
DT   27-JUN-2006, sequence version 2.
DT   25-MAY-2022, entry version 67.
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   Lactuca sativa (Garden lettuce).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; campanulids; Asterales; Asteraceae; Cichorioideae; Cichorieae;
OC   Lactucinae; Lactuca.
OX   NCBI_TaxID=4236;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. Cisco;
RX   PubMed=16604461; DOI=10.1007/s11248-005-3997-2;
RA   Kanamoto H., Yamashita A., Asao H., Okumura S., Takase H., Hattori M.,
RA   Yokota A., Tomizawa K.;
RT   "Efficient and stable transformation of Lactuca sativa L. cv. Cisco
RT   (lettuce) plastids.";
RL   Transgenic Res. 15:205-217(2006).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. Salinas;
RA   Timme R.E., Kuehl J.V., Boore J.L., Jansen R.K.;
RT   "A comparison of the first two published chloroplast genomes in Asteraceae:
RT   Lactuca and Helianthus.";
RL   Submitted (JAN-2006) to the EMBL/GenBank/DDBJ databases.
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   -!- ALTERNATIVE PRODUCTS:
CC       Event=Alternative splicing; Named isoforms=2;
CC       Name=Short;
CC         IsoId=Q332U6-1; Sequence=Displayed;
CC       Name=Long;
CC         IsoId=Q332U6-2; Sequence=VSP_019382;
CC   -!- MISCELLANEOUS: A longer mRNA that is not produced by splicing has been
CC       shown to be transcribed in barley and maize; it can also be predicted
CC       for this organism. It is not known if this mRNA is translated.
CC   -!- SIMILARITY: Belongs to the cytochrome b family. PetD subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01344}.
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DR   EMBL; AP007232; BAE47626.1; ALT_SEQ; Genomic_DNA.
DR   EMBL; DQ383816; ABD47263.1; -; Genomic_DNA.
DR   RefSeq; YP_398359.2; NC_007578.1.
DR   AlphaFoldDB; Q332U6; -.
DR   SMR; Q332U6; -.
DR   GeneID; 3772864; -.
DR   KEGG; lsv:3772864; -.
DR   OrthoDB; 1125966at2759; -.
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   Alternative splicing; Chloroplast; Electron transport; Membrane;
KW   Photosynthesis; Plastid; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..160
FT                   /note="Cytochrome b6-f complex subunit 4"
FT                   /id="PRO_0000061865"
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   VAR_SEQ         1..3
FT                   /note="MGV -> MSGSSGGWIYKNSPIPI (in isoform Long)"
FT                   /evidence="ECO:0000305"
FT                   /id="VSP_019382"
SQ   SEQUENCE   160 AA;  17459 MW;  F8A3275B4D5B24B0 CRC64;
     MGVTKKPDLN DPVLRAKLAK GMGHNYYGEP AWPNDLLYIF PVVILGTIAC NVGLAVLEPS
     MIGEPADPFA TPLEILPEWY FFPVFQILRT VPNKLLGVLL MVSVPAGLLT VPFLENVNKF
     QNPFRRPVAT TVFLIGTAVA LWLGIGATLP IDKSLTLGLF