ID   RCEM_RHOCA              Reviewed;         307 AA.
AC   P11847;
DT   01-OCT-1989, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 117.
DE   RecName: Full=Reaction center protein M chain;
DE   AltName: Full=Photosynthetic reaction center M subunit;
GN   Name=pufM;
OS   Rhodobacter capsulatus (Rhodopseudomonas capsulata).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC   Rhodobacteraceae; Rhodobacter.
OX   NCBI_TaxID=1061;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=6744416; DOI=10.1016/0092-8674(84)90429-x;
RA   Youvan D.C., Bylina E.J., Alberti M., Begusch H., Hearst J.E.;
RT   "Nucleotide and deduced polypeptide sequences of the photosynthetic
RT   reaction-center, B870 antenna, and flanking polypeptides from R.
RT   capsulata.";
RL   Cell 37:949-957(1984).
RN   [2]
RP   3D-STRUCTURE MODELING.
RX   PubMed=7479696; DOI=10.1002/prot.340220304;
RA   Foloppe N., Ferrand M., Breton J., Smith J.C.;
RT   "Structural model of the photosynthetic reaction center of Rhodobacter
RT   capsulatus.";
RL   Proteins 22:226-244(1995).
CC   -!- FUNCTION: The reaction center is a membrane-bound complex that mediates
CC       the initial photochemical event in the electron transfer process of
CC       photosynthesis.
CC   -!- SUBUNIT: Reaction center is composed of four bacteriochlorophylls, two
CC       bacteriopheophytins, two ubiquinones, one iron, and three highly
CC       hydrophobic polypeptide chains (designated L, M, and H).
CC   -!- SUBCELLULAR LOCATION: Cellular chromatophore membrane; Multi-pass
CC       membrane protein.
CC   -!- SIMILARITY: Belongs to the reaction center PufL/M/PsbA/D family.
CC       {ECO:0000305}.
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DR   EMBL; K01184; AAA26175.1; -; Genomic_DNA.
DR   EMBL; K01183; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   EMBL; Z11165; CAA77555.1; -; Genomic_DNA.
DR   PIR; A28771; A28771.
DR   RefSeq; WP_013066438.1; NZ_VIBE01000010.1.
DR   AlphaFoldDB; P11847; -.
DR   SMR; P11847; -.
DR   GeneID; 31489640; -.
DR   OMA; IFPHLDW; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0030077; C:plasma membrane light-harvesting complex; IEA:InterPro.
DR   GO; GO:0042717; C:plasma membrane-derived chromatophore membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0042314; F:bacteriochlorophyll binding; IEA:UniProtKB-KW.
DR   GO; GO:0045156; F:electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009772; P:photosynthetic electron transport in photosystem II; IEA:InterPro.
DR   Gene3D; 1.20.85.10; -; 2.
DR   InterPro; IPR036854; Photo_II_D1/D2_sf.
DR   InterPro; IPR000484; Photo_RC_L/M.
DR   InterPro; IPR005781; Photo_RC_M.
DR   Pfam; PF00124; Photo_RC; 1.
DR   PRINTS; PR00256; REACTNCENTRE.
DR   SUPFAM; SSF81483; SSF81483; 1.
DR   TIGRFAMs; TIGR01115; pufM; 1.
DR   PROSITE; PS00244; REACTION_CENTER; 1.
PE   3: Inferred from homology;
KW   Bacteriochlorophyll; Chlorophyll; Chromophore; Electron transport; Iron;
KW   Magnesium; Membrane; Metal-binding; Photosynthesis; Reaction center;
KW   Transmembrane; Transmembrane helix; Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT   CHAIN           2..307
FT                   /note="Reaction center protein M chain"
FT                   /id="PRO_0000090414"
FT   TRANSMEM        52..78
FT                   /note="Helical"
FT   TRANSMEM        110..139
FT                   /note="Helical"
FT   TRANSMEM        142..167
FT                   /note="Helical"
FT   TRANSMEM        197..225
FT                   /note="Helical"
FT   TRANSMEM        259..285
FT                   /note="Helical"
FT   BINDING         181
FT                   /ligand="(7R,8Z)-bacteriochlorophyll b"
FT                   /ligand_id="ChEBI:CHEBI:30034"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT   BINDING         201
FT                   /ligand="(7R,8Z)-bacteriochlorophyll b"
FT                   /ligand_id="ChEBI:CHEBI:30034"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT   BINDING         218
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT   BINDING         233
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT   BINDING         251
FT                   /ligand="a ubiquinone"
FT                   /ligand_id="ChEBI:CHEBI:16389"
FT   BINDING         265
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
SQ   SEQUENCE   307 AA;  34442 MW;  DC0D5EAB08B110C2 CRC64;
     MAEYQNFFNQ VQVAGAPEMG LKEDVDTFER TPAGMFNILG WMGNAQIGPI YLGIAGTVSL
     AFGAAWFFTI GVWYWYQAGF DPFIFMRDLF FFSLEPPPAE YGLAIAPLKQ GGVWQIASLF
     MAISVIAWWV RVYTRADQLG MGKHMAWAFL SAIWLWSVLG FWRPILMGSW SVAPPYGIFS
     HLDWTNQFSL DHGNLFYNPF HGLSIAALYG SALLFAMHGA TILAVTRFGG ERELEQIVDR
     GTASERAALF WRWTMGFNAT MEGIHRWAIW MAVMVTLTGG IGILLSGTVV DNWYVWAQVH
     GYAPVTP