Identification of a hemerythrin-like domain in a P1B-type transport ATPase

Matthew E. Traverso, Poorna Subramanian, Roman Davydov, Brian M. Hoffman, Timothy L. Stemmler, Amy C. Rosenzweig

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The P1B-type ATPases couple the energy of ATP hydrolysis to metal ion translocation across cell membranes. Important for prokaryotic metal resistance and essential metal distribution in eukaryotes, P1B- ATPases are divided into subclasses on the basis of their metal substrate specificities. Sequence analysis of putative P1B-5-ATPases, for which the substrate has not been identified, led to the discovery of a C-terminal soluble domain homologous to hemerythrin (Hr) proteins and domains. The Hr domain from the Acidothermus cellulolyticus P1B-5-ATPase was cloned, expressed, and purified (P1B-5-Hr). P1B-5-Hr binds two iron ions per monomer and adopts a predominantly helical fold. Optical absorption features of the iron-loaded and azide-treated protein are consistent with features observed for other Hr proteins. Autoxidation to the met form is very rapid, as reported for other prokaryotic Hr domains. The presence of a diiron center was confirmed by electron paramagnetic resonance (EPR) and X-ray absorption spectroscopic (XAS) data. The occurrence of a Hr-like domain in a P-type ATPase is unprecedented and suggests new regulatory mechanisms as well as an expanded function for Hr proteins in biology.

Original languageEnglish (US)
Pages (from-to)7060-7068
Number of pages9
JournalBiochemistry
Volume49
Issue number33
DOIs
StatePublished - Aug 24 2010

ASJC Scopus subject areas

  • Biochemistry

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