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Scientists Probe the Mechanism for Microbial Carbon Fixation
Colloquium Next Week: Congressman Bill Foster
Monday - September 20, 2010 |
Scientists Probe the Mechanism for Microbial Carbon FixationEven the smallest organisms can help address the problem of increasing pollutants and greenhouse gases in the Earth's atmosphere. Each year, some microorganisms using the enzyme carbon monoxide dehydrogenase, or CODH, take an estimated 100 million tons of carbon monoxide from our air, while others use CODH to produce 10 billion tons of acetate from carbon dioxide. CODH catalyzes the reversible reaction of carbon monoxide to CO2, which different types of bacteria use in creating the molecules they need to live. The enzyme has a complicated metal cluster, the C-cluster, which includes nickel, iron and sulfur ions in its active site, that performs this unusual chemistry. Understanding how this catalysis works may provide insights to chemical engineers wanting to duplicate this chemical process as a solution to the buildup of greenhouse gases in the atmosphere. A team of scientists led by Catherine Drennan of MIT used the Stanford Synchrotron Radiation Lightsource Beamline 11-1 and a beamline at Lawrence Berkeley National Laboratory's Advanced Light Source to decipher the mechanism of CODH's reaction. They deciphered crystal structures of the C-cluster bound to its target and a molecule that inhibits its action. Analyzing the structures, they were able to deduce the roles of the bound metals and the mechanism of the reaction. This clearer understanding of how this microbial enzyme performs its difficult chemistry could lead to methods of controlling pollutants and greenhouse gases in our atmosphere. This work was published in the journal Biochemistry. To learn more about this research see the full scientific highlight. Colloquium Next Week:
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