Carboxysomal carbonic anhydrases: Structure and role in microbial CO2 fixation

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Cyanobacteria and some chemoautotrophic bacteria are able to grow in environments with limiting CO2 concentrations by employing a CO2-concentrating mechanism (CCM) that allows them to accumulate inorganic carbon in their cytoplasm to concentrations several orders of magnitude higher than that on the outside. The final step of this process takes place in polyhedral protein microcompartments known as carboxysomes, which contain the majority of the CO2-fixing enzyme, RubisCO. The efficiency of CO2 fixation by the sequestered RubisCO is enhanced by co-localization with a specialized carbonic anhydrase that catalyzes dehydration of the cytoplasmic bicarbonate and ensures saturation of RubisCO with its substrate, ... continued below

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Cannon, Gordon C.; Heinhorst, Sabine & Kerfeld, Cheryl A. June 23, 2010.

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Cyanobacteria and some chemoautotrophic bacteria are able to grow in environments with limiting CO2 concentrations by employing a CO2-concentrating mechanism (CCM) that allows them to accumulate inorganic carbon in their cytoplasm to concentrations several orders of magnitude higher than that on the outside. The final step of this process takes place in polyhedral protein microcompartments known as carboxysomes, which contain the majority of the CO2-fixing enzyme, RubisCO. The efficiency of CO2 fixation by the sequestered RubisCO is enhanced by co-localization with a specialized carbonic anhydrase that catalyzes dehydration of the cytoplasmic bicarbonate and ensures saturation of RubisCO with its substrate, CO2. There are two genetically distinct carboxysome types that differ in their protein composition and in the carbonic anhydrase(s) they employ. Here we review the existing information concerning the genomics, structure and enzymology of these uniquely adapted carbonic anhydrases, which are of fundamental importance in the global carbon cycle.

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  • Journal Name: Biochimica et Biophysica Acta; Journal Volume: 1804; Journal Issue: 2; Related Information: Journal Publication Date: February 2010

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  • Report No.: LBNL-4679E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1023373
  • Archival Resource Key: ark:/67531/metadc840980

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  • June 23, 2010

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 10:34 p.m.

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Cannon, Gordon C.; Heinhorst, Sabine & Kerfeld, Cheryl A. Carboxysomal carbonic anhydrases: Structure and role in microbial CO2 fixation, article, June 23, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc840980/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.