HemQ: An iron-coproporphyrin oxidative decarboxylase for protoheme synthesis in Firmicutes and Actinobacteria
Abstract
Genes for chlorite dismutase-like proteins are found widely among heme-synthesizing bacteria and some Archaea. It is now known that among the Firmicutes and Actinobacteria these proteins do not possess chlorite dismutase activity but instead are essential for heme synthesis. These proteins, named HemQ, are ironcoproporphyrin (coproheme) decarboxylases that catalyze the oxidative decarboxylation of coproheme III into protoheme IX. As purified, HemQs do not contain bound heme, but readily bind exogeneously supplied heme with low micromolar affinity. We find that the heme-bound form of HemQ has low peroxidase activity and in the presence of peroxide the bound heme may be destroyed. Furthermore, it is possible that HemQ may serve a dual role as a decarboxylase in heme biosynthesis and a regulatory protein in heme homeostasis.
- Authors:
-
- Univ. of Georgia, Athens, GA (United States). Inst. of Biomedical and Health Sciences
- Argonne National Lab. (ANL), Argonne, IL (United States). Mathematics and Computer Science Division
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE; National Institutes of Health (NIH)
- OSTI Identifier:
- 1263632
- Grant/Contract Number:
- DK096051
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Archives of Biochemistry and Biophysics
- Additional Journal Information:
- Journal Volume: 574; Journal Issue: C; Journal ID: ISSN 0003-9861
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; HemQ; Heme synthesis; coproheme decarboxylase; chlorite dismutase-like protein
Citation Formats
Dailey, Harry A., and Gerdes, Svetlana. HemQ: An iron-coproporphyrin oxidative decarboxylase for protoheme synthesis in Firmicutes and Actinobacteria. United States: N. p., 2015.
Web. doi:10.1016/j.abb.2015.02.017.
Dailey, Harry A., & Gerdes, Svetlana. HemQ: An iron-coproporphyrin oxidative decarboxylase for protoheme synthesis in Firmicutes and Actinobacteria. United States. https://doi.org/10.1016/j.abb.2015.02.017
Dailey, Harry A., and Gerdes, Svetlana. Sat .
"HemQ: An iron-coproporphyrin oxidative decarboxylase for protoheme synthesis in Firmicutes and Actinobacteria". United States. https://doi.org/10.1016/j.abb.2015.02.017. https://www.osti.gov/servlets/purl/1263632.
@article{osti_1263632,
title = {HemQ: An iron-coproporphyrin oxidative decarboxylase for protoheme synthesis in Firmicutes and Actinobacteria},
author = {Dailey, Harry A. and Gerdes, Svetlana},
abstractNote = {Genes for chlorite dismutase-like proteins are found widely among heme-synthesizing bacteria and some Archaea. It is now known that among the Firmicutes and Actinobacteria these proteins do not possess chlorite dismutase activity but instead are essential for heme synthesis. These proteins, named HemQ, are ironcoproporphyrin (coproheme) decarboxylases that catalyze the oxidative decarboxylation of coproheme III into protoheme IX. As purified, HemQs do not contain bound heme, but readily bind exogeneously supplied heme with low micromolar affinity. We find that the heme-bound form of HemQ has low peroxidase activity and in the presence of peroxide the bound heme may be destroyed. Furthermore, it is possible that HemQ may serve a dual role as a decarboxylase in heme biosynthesis and a regulatory protein in heme homeostasis.},
doi = {10.1016/j.abb.2015.02.017},
journal = {Archives of Biochemistry and Biophysics},
number = C,
volume = 574,
place = {United States},
year = {Sat Feb 21 00:00:00 EST 2015},
month = {Sat Feb 21 00:00:00 EST 2015}
}
Web of Science
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