ID   PETL_NOSS1              Reviewed;          31 AA.
AC   Q8YVQ2;
DT   15-MAY-2002, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   25-MAY-2022, entry version 88.
DE   RecName: Full=Cytochrome b6-f complex subunit 6 {ECO:0000255|HAMAP-Rule:MF_00433};
DE   AltName: Full=Cytochrome b6-f complex subunit PetL {ECO:0000255|HAMAP-Rule:MF_00433};
DE   AltName: Full=Cytochrome b6-f complex subunit VI {ECO:0000255|HAMAP-Rule:MF_00433};
GN   Name=petL {ECO:0000255|HAMAP-Rule:MF_00433}; OrderedLocusNames=asl1922;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
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. PetL is
CC       important for photoautotrophic growth as well as for electron transfer
CC       efficiency and stability of the cytochrome b6-f complex.
CC       {ECO:0000255|HAMAP-Rule:MF_00433}.
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. {ECO:0000255|HAMAP-
CC       Rule:MF_00433}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00433}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00433}.
CC   -!- SIMILARITY: Belongs to the PetL family. {ECO:0000255|HAMAP-
CC       Rule:MF_00433}.
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DR   EMBL; BA000019; BAB73621.1; -; Genomic_DNA.
DR   PIR; AD2046; AD2046.
DR   RefSeq; WP_010996086.1; NZ_RSCN01000031.1.
DR   PDB; 2ZT9; X-ray; 3.00 A; E=1-31.
DR   PDB; 4H44; X-ray; 2.70 A; E=1-31.
DR   PDB; 4OGQ; X-ray; 2.50 A; E=1-31.
DR   PDBsum; 2ZT9; -.
DR   PDBsum; 4H44; -.
DR   PDBsum; 4OGQ; -.
DR   AlphaFoldDB; Q8YVQ2; -.
DR   SMR; Q8YVQ2; -.
DR   DIP; DIP-61004N; -.
DR   IntAct; Q8YVQ2; 1.
DR   STRING; 103690.17131012; -.
DR   TCDB; 3.D.3.5.6; the proton-translocating quinol:cytochrome c reductase (qcr) superfamily.
DR   EnsemblBacteria; BAB73621; BAB73621; BAB73621.
DR   GeneID; 58721953; -.
DR   KEGG; ana:asl1922; -.
DR   OrthoDB; 2098883at2; -.
DR   EvolutionaryTrace; Q8YVQ2; -.
DR   Proteomes; UP000002483; Chromosome.
DR   GO; GO:0009512; C:cytochrome b6f complex; IEA:InterPro.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   HAMAP; MF_00433; Cytb6_f_PetL; 1.
DR   InterPro; IPR007802; Cyt_b6/f_cplx_su6.
DR   Pfam; PF05115; PetL; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Electron transport; Membrane; Photosynthesis;
KW   Reference proteome; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..31
FT                   /note="Cytochrome b6-f complex subunit 6"
FT                   /id="PRO_0000220485"
FT   TRANSMEM        3..23
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00433"
FT   HELIX           2..27
FT                   /evidence="ECO:0007829|PDB:4OGQ"
SQ   SEQUENCE   31 AA;  3225 MW;  CC7D4752D11CB08F CRC64;
     MLAIVAYIGF LALFTGIAAG LLFGLRSAKI L