ID   PETD_ADICA              Reviewed;         159 AA.
AC   Q85FJ2;
DT   05-JUL-2005, integrated into UniProtKB/Swiss-Prot.
DT   16-AUG-2004, sequence version 2.
DT   25-MAY-2022, entry version 73.
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   Adiantum capillus-veneris (Maidenhair fern).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Polypodiopsida; Polypodiidae; Polypodiales; Pteridineae; Pteridaceae;
OC   Vittarioideae; Adiantum.
OX   NCBI_TaxID=13818;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=12755170; DOI=10.1093/dnares/10.2.59;
RA   Wolf P.G., Rowe C.A., Sinclair R.B., Hasebe M.;
RT   "Complete nucleotide sequence of the chloroplast genome from a
RT   leptosporangiate fern, Adiantum capillus-veneris L.";
RL   DNA Res. 10:59-65(2003).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND RNA EDITING.
RC   TISSUE=Frond;
RX   PubMed=15363849; DOI=10.1016/j.gene.2004.06.018;
RA   Wolf P.G., Rowe C.A., Hasebe M.;
RT   "High levels of RNA editing in a vascular plant chloroplast genome:
RT   analysis of transcripts from the fern Adiantum capillus-veneris.";
RL   Gene 339:89-97(2004).
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   -!- RNA EDITING: Modified_positions=36 {ECO:0000269|PubMed:15363849}, 99
CC       {ECO:0000269|PubMed:15363849}, 142 {ECO:0000269|PubMed:15363849}, 160
CC       {ECO:0000269|PubMed:15363849}; Note=The stop codon at position 160 is
CC       created by RNA editing.;
CC   -!- SIMILARITY: Belongs to the cytochrome b family. PetD subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01344}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; AY178864; AAP29421.2; -; Genomic_DNA.
DR   RefSeq; NP_848090.2; NC_004766.1.
DR   AlphaFoldDB; Q85FJ2; -.
DR   SMR; Q85FJ2; -.
DR   GeneID; 807421; -.
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   2: Evidence at transcript level;
KW   Chloroplast; Electron transport; Membrane; Photosynthesis; Plastid;
KW   RNA editing; Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..159
FT                   /note="Cytochrome b6-f complex subunit 4"
FT                   /id="PRO_0000061842"
FT   TRANSMEM        35..55
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
FT   TRANSMEM        94..114
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
FT   TRANSMEM        130..150
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01344"
SQ   SEQUENCE   159 AA;  17188 MW;  3ABA58E9E45F33E5 CRC64;
     MGVKKPDLND PVLRAKLAKG MGHNYYGEPA WPNDLLYIFP VVILGTVACT VGLAVLEPSM
     VGEPANPFAT PLEILPEWYF FPVFQILRTV PNKLLGVLLM ASVPAGLLTV PFLENVNKFQ
     NPFRRPVATT VFAIGTVAAI WLGIGATLPI EGSLTLGLF