CTAA_RICB8
ID CTAA_RICB8 Reviewed; 336 AA.
AC A8GXM1;
DT 02-SEP-2008, integrated into UniProtKB/Swiss-Prot.
DT 02-SEP-2008, sequence version 2.
DT 03-AUG-2022, entry version 71.
DE RecName: Full=Heme A synthase {ECO:0000255|HAMAP-Rule:MF_01665};
DE Short=HAS {ECO:0000255|HAMAP-Rule:MF_01665};
DE EC=1.17.99.9 {ECO:0000255|HAMAP-Rule:MF_01665};
DE AltName: Full=Cytochrome aa3-controlling protein {ECO:0000255|HAMAP-Rule:MF_01665};
GN Name=ctaA {ECO:0000255|HAMAP-Rule:MF_01665}; OrderedLocusNames=A1I_06525;
OS Rickettsia bellii (strain OSU 85-389).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Rickettsiales;
OC Rickettsiaceae; Rickettsieae; Rickettsia; belli group.
OX NCBI_TaxID=391896;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=OSU 85-389;
RA Madan A., Lee H., Madan A., Yoon J.-G., Ryu G.-Y., Dasch G., Ereemeva M.;
RT "Complete genome sequencing of Rickettsia bellii.";
RL Submitted (SEP-2007) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Catalyzes the conversion of heme O to heme A by two
CC successive hydroxylations of the methyl group at C8. The first
CC hydroxylation forms heme I, the second hydroxylation results in an
CC unstable dihydroxymethyl group, which spontaneously dehydrates,
CC resulting in the formyl group of heme A. {ECO:0000255|HAMAP-
CC Rule:MF_01665}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=2 A + Fe(II)-heme o + H2O = 2 AH2 + Fe(II)-heme a;
CC Xref=Rhea:RHEA:63388, ChEBI:CHEBI:13193, ChEBI:CHEBI:15377,
CC ChEBI:CHEBI:17499, ChEBI:CHEBI:60530, ChEBI:CHEBI:61715;
CC EC=1.17.99.9; Evidence={ECO:0000255|HAMAP-Rule:MF_01665};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:63389;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01665};
CC -!- COFACTOR:
CC Name=heme b; Xref=ChEBI:CHEBI:60344;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01665};
CC -!- PATHWAY: Porphyrin-containing compound metabolism; heme A biosynthesis;
CC heme A from heme O: step 1/1. {ECO:0000255|HAMAP-Rule:MF_01665}.
CC -!- SUBUNIT: Interacts with CtaB. {ECO:0000255|HAMAP-Rule:MF_01665}.
CC -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000255|HAMAP-Rule:MF_01665};
CC Multi-pass membrane protein {ECO:0000255|HAMAP-Rule:MF_01665}.
CC -!- SIMILARITY: Belongs to the COX15/CtaA family. Type 2 subfamily.
CC {ECO:0000255|HAMAP-Rule:MF_01665}.
CC -!- SEQUENCE CAUTION:
CC Sequence=ABV79621.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR EMBL; CP000849; ABV79621.1; ALT_INIT; Genomic_DNA.
DR RefSeq; WP_041808456.1; NC_009883.1.
DR AlphaFoldDB; A8GXM1; -.
DR SMR; A8GXM1; -.
DR KEGG; rbo:A1I_06525; -.
DR HOGENOM; CLU_017627_0_0_5; -.
DR UniPathway; UPA00269; UER00713.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0016653; F:oxidoreductase activity, acting on NAD(P)H, heme protein as acceptor; IEA:InterPro.
DR GO; GO:0006784; P:heme A biosynthetic process; IEA:UniProtKB-UniRule.
DR HAMAP; MF_01665; HemeA_synth_type2; 1.
DR InterPro; IPR003780; COX15/CtaA_fam.
DR InterPro; IPR023754; HemeA_Synthase_type2.
DR PANTHER; PTHR23289; PTHR23289; 1.
DR Pfam; PF02628; COX15-CtaA; 1.
PE 3: Inferred from homology;
KW Cell membrane; Heme biosynthesis; Iron; Membrane; Metal-binding;
KW Oxidoreductase; Transmembrane; Transmembrane helix.
FT CHAIN 1..336
FT /note="Heme A synthase"
FT /id="PRO_0000349072"
FT TRANSMEM 5..25
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 92..112
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 117..137
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 153..173
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 191..211
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 257..277
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 284..304
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT TRANSMEM 307..327
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01665"
FT BINDING 255
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_01665"
FT BINDING 315
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_01665"
SQ SEQUENCE 336 AA; 38249 MW; 682F89DE72040F3E CRC64;
MQKNLTRWLL TCCIMVVAMI IVGGITRLTD SGLSIVEWRP VTGILPPFSY DTWQAEFAKY
KAFPEYNAVN YGMTLSEFKF IYLLEFVHRL LGRATGLIYI LPLIYFYFKG IIKNRDILSY
IIVLLLFCVQ GFMGWYMVKS GLVNHPSVSH FRLAFHLIIA VIIYHLLFYK LVKNCCDILL
IPSQINLKLP LIFSVAAIAM IYVQIFLGAL VAGLDAGLIY NSFPLMGGNF IPIEIKDNFI
SFKNWYDPVF VQFMHRLGAY SLSIIVIALI ISLLKVKNPK LNKVAFYLSI ALLIQLSTGV
ITLLYHVPII AASMHQFFAI VLLSVVIWCY SLIKNS
