Entry
Name
hydrogen peroxide-dependent heme synthase;
coproheme III oxidative decarboxylase;
hemQ (gene name)
Class
Oxidoreductases;
Acting on the CH-CH group of donors;
With other, known, physiological acceptors
BRITE hierarchy
Sysname
Fe-coproporphyrin III:hydrogen peroxide oxidoreductase (decarboxylating)
Reaction(IUBMB)
Fe-coproporphyrin III + 2 H2O2 = protoheme + 2 CO2 + 4 H2O (overall reaction) [RN:
R11522 ];
(1a) Fe-coproporphyrin III + H2O2 = harderoheme III + CO2 + 2 H2O [RN:
R12454 ];
(1b) harderoheme III + H2O2 = protoheme + CO2 + 2 H2O [RN:
R12455 ]
Reaction(KEGG)
Substrate
Product
Comment
The enzyme participates in a heme biosynthesis pathway found in Gram-positive bacteria. The initial decarboxylation step is fast and yields the three-propanoate harderoheme isomer III. The second decarboxylation is much slower. cf. EC
1.3.98.6 , SAM-dependent heme synthase.
History
EC 1.3.98.5 created 2019
Pathway
ec01110 Biosynthesis of secondary metabolites
Orthology
K00435 hydrogen peroxide-dependent heme synthase
K25033 hydrogen peroxide-dependent heme synthase
Genes
BAZ : BAMTA208_19065(ywfI)
BFX : BC359_01695 BC359_07410
NCM : QNK12_16750 QNK12_30530
PPQ : PPSQR21_041190(ywfI)
PTA : HPL003_01340 HPL003_02245
ACUR : JZ785_12450 JZ785_16020
MPHL : MPHLCCUG_03080(cld)
SLE : sle_16390(sle_16390)
SNQ : CP978_03140 CP978_26100
ATIM : CYJ17_0005020(hemQ)
SAIM : K0C01_07570 K0C01_11015
HAE : halTADL_0324 halTADL_1349
» show all
Taxonomy
Reference
Authors
Dailey TA, Boynton TO, Albetel AN, Gerdes S, Johnson MK, Dailey HA
Title
Discovery and Characterization of HemQ: an essential heme biosynthetic pathway component.
Journal
Reference
Authors
Celis AI, Streit BR, Moraski GC, Kant R, Lash TD, Lukat-Rodgers GS, Rodgers KR, DuBois JL
Title
Unusual Peroxide-Dependent, Heme-Transforming Reaction Catalyzed by HemQ.
Journal
Reference
Authors
Hofbauer S, Mlynek G, Milazzo L, Puhringer D, Maresch D, Schaffner I, Furtmuller PG, Smulevich G, Djinovic-Carugo K, Obinger C
Title
Hydrogen peroxide-mediated conversion of coproheme to heme b by HemQ-lessons from the first crystal structure and kinetic studies.
Journal
Sequence
Reference
Authors
Celis AI, Gauss GH, Streit BR, Shisler K, Moraski GC, Rodgers KR, Lukat-Rodgers GS, Peters JW, DuBois JL
Title
Structure-Based Mechanism for Oxidative Decarboxylation Reactions Mediated by Amino Acids and Heme Propionates in Coproheme Decarboxylase (HemQ).
Journal
Sequence
Other DBs
ExplorEnz - The Enzyme Database: 1.3.98.5
ExPASy - ENZYME nomenclature database: 1.3.98.5