ID   BFR_MYCAV               Reviewed;         159 AA.
AC   P43314;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 90.
DE   RecName: Full=Bacterioferritin;
DE            Short=BFR;
DE            EC=1.16.3.1;
GN   Name=bfr;
OS   Mycobacterium avium.
OC   Bacteria; Actinobacteria; Corynebacteriales; Mycobacteriaceae;
OC   Mycobacterium; Mycobacterium avium complex (MAC).
OX   NCBI_TaxID=1764;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=Subsp. silvaticum JD88/118;
RX   PubMed=7959057; DOI=10.1016/0378-1119(94)90889-3;
RA   Inglis N.F., Stevenson K., Hosie A.H.F., Sharp J.M.;
RT   "Complete sequence of the gene encoding the bacterioferritin subunit of
RT   Mycobacterium avium subspecies silvaticum.";
RL   Gene 150:205-206(1994).
CC   -!- FUNCTION: Iron-storage protein, whose ferroxidase center binds Fe(2+)
CC       ions, oxidizes them by dioxygen to Fe(3+), and participates in the
CC       subsequent Fe(3+) oxide mineral core formation within the central
CC       cavity of the protein complex. {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4 Fe(2+) + 4 H(+) + O2 = 4 Fe(3+) + 2 H2O;
CC         Xref=Rhea:RHEA:11148, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:15379, ChEBI:CHEBI:29033, ChEBI:CHEBI:29034; EC=1.16.3.1;
CC   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344; Evidence={ECO:0000250};
CC       Note=Binds 1 heme b (iron(II)-protoporphyrin IX) group per dimer.
CC       {ECO:0000250};
CC   -!- COFACTOR:
CC       Name=Fe cation; Xref=ChEBI:CHEBI:24875; Evidence={ECO:0000250};
CC       Note=Binds 2 iron ions per subunit. The catalytic dinuclear iron-
CC       binding site within each subunit is known as the ferroxidase center.
CC       {ECO:0000250};
CC   -!- SUBUNIT: Homooligomer of 24 subunits, arranged as 12 dimers, that are
CC       packed together to form an approximately spherical molecule with a
CC       central cavity, in which large amounts of iron can be deposited.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the bacterioferritin family. {ECO:0000305}.
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DR   EMBL; X76906; CAA54227.1; -; Genomic_DNA.
DR   AlphaFoldDB; P43314; -.
DR   GO; GO:0008199; F:ferric iron binding; IEA:InterPro.
DR   GO; GO:0004322; F:ferroxidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0006879; P:cellular iron ion homeostasis; IEA:UniProtKB-KW.
DR   GO; GO:0006826; P:iron ion transport; IEA:InterPro.
DR   CDD; cd00907; Bacterioferritin; 1.
DR   Gene3D; 1.20.1260.10; -; 1.
DR   InterPro; IPR002024; Bacterioferritin.
DR   InterPro; IPR012347; Ferritin-like.
DR   InterPro; IPR009040; Ferritin-like_diiron.
DR   InterPro; IPR009078; Ferritin-like_SF.
DR   InterPro; IPR008331; Ferritin_DPS_dom.
DR   Pfam; PF00210; Ferritin; 1.
DR   PIRSF; PIRSF002560; Bacterioferritin; 1.
DR   PRINTS; PR00601; BACFERRITIN.
DR   SUPFAM; SSF47240; SSF47240; 1.
DR   TIGRFAMs; TIGR00754; bfr; 1.
DR   PROSITE; PS00549; BACTERIOFERRITIN; 1.
DR   PROSITE; PS50905; FERRITIN_LIKE; 1.
PE   3: Inferred from homology;
KW   Heme; Iron; Iron storage; Metal-binding; Oxidoreductase.
FT   CHAIN           1..159
FT                   /note="Bacterioferritin"
FT                   /id="PRO_0000192598"
FT   DOMAIN          1..145
FT                   /note="Ferritin-like diiron"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         51
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         51
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         52
FT                   /ligand="heme b"
FT                   /ligand_id="ChEBI:CHEBI:60344"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         54
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         94
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         127
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         127
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
FT   BINDING         130
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00085"
SQ   SEQUENCE   159 AA;  18492 MW;  7D7EA1588BFC23B0 CRC64;
     MQGDPEVLRL LNEQLTTQLT AINQYFLHSK MQDNWGFTEL AEHTRAESFD EMRHAEAITD
     RILLLDGLPN YQRLFSLRIG QTLREQFEAD LAIEYEVMDR LKPAIILCRE KQDSTTATLF
     EQIVADEEKH IDYLETQLEL MDKLGVELYS AQCVSRPPS