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Gold helps bacteria to oxidize methane.
L A Levchenko1, A P Sadkov, N V Lariontseva
1Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia.
Journal of Inorganic Biochemistry
|March 19, 2002
Summary
Researchers discovered a gold-containing protein from Micrococcus luteus bacteria that catalyzes methane oxidation. This protein, termed Au-protein, converts methane to methanol, potentially aiding bacterial survival in nutrient-scarce environments.
Area of Science:
- Biochemistry
- Microbiology
- Environmental Science
Background:
- Micrococcus luteus bacteria possess unique metabolic capabilities.
- Gold-containing proteins (Au-proteins) are of interest for their potential biological roles.
- Methane oxidation is a key biogeochemical process.
Purpose of the Study:
- To investigate the catalytic activity of Au-protein isolated from Micrococcus luteus.
- To determine if Au-protein can catalyze methane oxidation.
- To understand the potential role of Au-protein in bacterial survival.
Main Methods:
- Isolation of gold-containing protein (Au-protein) from Micrococcus luteus.
- Use of labeled methane-14C to track methane conversion.
- Chromatographic analysis to identify reaction products.
- Enzymatic assays in a system containing NADH, air, K(3)Fe(CN)(6), and Tris-HCl buffer.
Main Results:
- Au-protein isolated from Micrococcus luteus was shown to catalyze the oxidation of methane.
- The reaction product was identified as methanol.
- The catalytic activity was observed in a specific biochemical system.
Conclusions:
- Au-protein from Micrococcus luteus possesses methane monooxygenase activity, converting methane to methanol.
- This enzymatic activity may enable bacteria to utilize methane as a carbon and energy source.
- Au-protein likely plays a role in the survival of Micrococcus luteus under limited nutrient conditions.