ID   HDOX_BACC7              Reviewed;         107 AA.
AC   B7HRI4;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-FEB-2009, sequence version 1.
DT   03-AUG-2022, entry version 67.
DE   RecName: Full=Heme-degrading monooxygenase {ECO:0000255|HAMAP-Rule:MF_01272};
DE            EC=1.14.14.18 {ECO:0000255|HAMAP-Rule:MF_01272};
DE   AltName: Full=Heme oxygenase {ECO:0000255|HAMAP-Rule:MF_01272};
DE   AltName: Full=Iron-regulated surface determinant {ECO:0000255|HAMAP-Rule:MF_01272};
DE   AltName: Full=Iron-responsive surface determinant {ECO:0000255|HAMAP-Rule:MF_01272};
GN   Name=isdG {ECO:0000255|HAMAP-Rule:MF_01272};
GN   OrderedLocusNames=BCAH187_A4669;
OS   Bacillus cereus (strain AH187).
OC   Bacteria; Firmicutes; Bacilli; Bacillales; Bacillaceae; Bacillus;
OC   Bacillus cereus group.
OX   NCBI_TaxID=405534;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=AH187;
RA   Dodson R.J., Durkin A.S., Rosovitz M.J., Rasko D.A., Kolsto A.B.,
RA   Okstad O.A., Ravel J., Sutton G.;
RT   "Genome sequence of Bacillus cereus AH187.";
RL   Submitted (OCT-2008) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Allows bacterial pathogens to use the host heme as an iron
CC       source. Catalyzes the oxidative degradation of the heme macrocyclic
CC       porphyrin ring to the biliverdin in the presence of a suitable electron
CC       donor such as ascorbate or NADPH--cytochrome P450 reductase, with
CC       subsequent release of free iron. {ECO:0000255|HAMAP-Rule:MF_01272}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=heme b + 3 O2 + 3 reduced [NADPH--hemoprotein reductase] =
CC         biliverdin IXalpha + CO + Fe(2+) + H(+) + 3 H2O + 3 oxidized [NADPH--
CC         hemoprotein reductase]; Xref=Rhea:RHEA:21764, Rhea:RHEA-COMP:11964,
CC         Rhea:RHEA-COMP:11965, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:15379, ChEBI:CHEBI:17245, ChEBI:CHEBI:29033,
CC         ChEBI:CHEBI:57618, ChEBI:CHEBI:57991, ChEBI:CHEBI:58210,
CC         ChEBI:CHEBI:60344; EC=1.14.14.18; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01272};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01272}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_01272}.
CC   -!- SIMILARITY: Belongs to the antibiotic biosynthesis monooxygenase
CC       family. Heme-degrading monooxygenase IsdG subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01272}.
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DR   EMBL; CP001177; ACJ79438.1; -; Genomic_DNA.
DR   RefSeq; WP_000587815.1; NC_011658.1.
DR   AlphaFoldDB; B7HRI4; -.
DR   SMR; B7HRI4; -.
DR   EnsemblBacteria; ACJ79438; ACJ79438; BCAH187_A4669.
DR   GeneID; 59154876; -.
DR   GeneID; 64203135; -.
DR   KEGG; bcr:BCAH187_A4669; -.
DR   HOGENOM; CLU_141544_2_1_9; -.
DR   OMA; FRESHSH; -.
DR   OrthoDB; 1562645at2; -.
DR   Proteomes; UP000002214; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0020037; F:heme binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004392; F:heme oxygenase (decyclizing) activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0042167; P:heme catabolic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0033212; P:iron import into cell; IEA:InterPro.
DR   HAMAP; MF_01272; Heme_degrading_monooxygenase; 1.
DR   InterPro; IPR007138; ABM_dom.
DR   InterPro; IPR011008; Dimeric_a/b-barrel.
DR   InterPro; IPR023953; IsdG.
DR   Pfam; PF03992; ABM; 1.
DR   SUPFAM; SSF54909; SSF54909; 1.
DR   PROSITE; PS51725; ABM; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Heme; Iron; Metal-binding; Monooxygenase; Oxidoreductase.
FT   CHAIN           1..107
FT                   /note="Heme-degrading monooxygenase"
FT                   /id="PRO_1000140204"
FT   DOMAIN          2..94
FT                   /note="ABM"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01272"
FT   BINDING         6
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01272"
FT   BINDING         76
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01272"
FT   SITE            66
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01272"
SQ   SEQUENCE   107 AA;  12004 MW;  ACB308A337A92DFB CRC64;
     MIIVTNTAKI TKGNGHKLID RFNKVGQVET MPGFLGLEVL LTQNTVDYDE VTISTRWNAK
     EDFQGWTKSP AFKAAHSHQG GMPDYILDNK ISYYDVKVVR MPMAAAQ