ID   RCEM_PARPM              Reviewed;         256 AA.
AC   P51751;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 100.
DE   RecName: Full=Reaction center protein M chain;
DE   AltName: Full=Photosynthetic reaction center M subunit;
DE   Flags: Fragment;
GN   Name=pufM;
OS   Pararhodospirillum photometricum (Rhodospirillum photometricum).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodospirillales;
OC   Rhodospirillaceae; Pararhodospirillum.
OX   NCBI_TaxID=1084;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=D / ATCC 17899 / DSM 180;
RX   PubMed=9236272; DOI=10.1007/pl00006212;
RA   Nagashima K.V., Hiraishi A., Shimada K., Matsuura K.;
RT   "Horizontal transfer of genes coding for the photosynthetic reaction
RT   centers of purple bacteria.";
RL   J. Mol. Evol. 45:131-136(1997).
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 two highly
CC       hydrophobic polypeptide chains (designated L and M).
CC   -!- SUBCELLULAR LOCATION: Cellular chromatophore membrane {ECO:0000250};
CC       Multi-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the reaction center PufL/M/PsbA/D family.
CC       {ECO:0000305}.
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DR   EMBL; D50681; BAA09330.1; -; Genomic_DNA.
DR   PIR; T10821; T10821.
DR   AlphaFoldDB; P51751; -.
DR   SMR; P51751; -.
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                   /evidence="ECO:0000250"
FT   CHAIN           2..>256
FT                   /note="Reaction center protein M chain"
FT                   /id="PRO_0000090416"
FT   TRANSMEM        52..78
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        110..139
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        142..167
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        197..225
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
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                   /evidence="ECO:0000250"
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                   /evidence="ECO:0000250"
FT   BINDING         218
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000250"
FT   BINDING         233
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000250"
FT   BINDING         251
FT                   /ligand="a ubiquinone"
FT                   /ligand_id="ChEBI:CHEBI:16389"
FT                   /evidence="ECO:0000250"
FT   NON_TER         256
SQ   SEQUENCE   256 AA;  28788 MW;  B4C554BEC518B9FB CRC64;
     MADYQNILTP CRFAPKPHHG VELPRGNWAE KARPIFVWLL GKIGDASSDH PPGVAGTVSA
     VLFAFAFLII GANFLASVDW NPIEFIRLLP WLALEPPRPN WAWVLAPMNE GGWWQITGFF
     LTMSLLVWWW HVYNRARALG LGTHMAWAFA SALFLYLTLG FIRPLLLGNW GEAVPFGLFA
     HLDWTAAFSL RYGNLYYNPF HMLSIAFLYG SAVLFAMHGA TILAVSHLGG DREVEQITDR
     GTAAERAALF WRWTMG