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Biochemical Study of Multiple CheY Response Regulators of the Chemotactic Pathway of Rhodobacter sphaeroides. Axelle Ferré, 2004.The six copies of the response regulator CheY from Rhodobacter sphaeroides bind to the switch protein FliM . Phosphorylation by acetyl phosphate (AcP) was detected by tryptophan fluorescence quenching in three of the four CheYs that contain this residue . Autophosphorylation with Ac32P was observed in five CheY proteins . We also show that all of the cheY genes are expressed simultaneously; therefore, in vivo all of the CheY proteins could bind to FliM to control the chemotactic response . Consequently, we hypothesize that in this complex chemotactic system, the binding of some CheY proteins to FliM, does not necessarily imply switching of the flagellar motor . Anaerobic Mineralization of Quaternary Carbon Atoms: Isolation of Denitrifying Bacteria on Pivalic Acid (2,2-Dimethylpropionic Acid). Christina Probian, 2003.The degradability of pivalic acid was established by the isolation of several facultative denitrifying strains belonging to Zoogloea resiniphila, to Thauera and Herbaspirillum, and to Comamonadaceae, related to [Aquaspirillum] and Acidovorax, and of a nitrate-reducing bacterium affiliated with Moraxella osloensis . Pivalic acid was completely mineralized to carbon dioxide . The catabolic pathways may involve an oxidation to dimethylmalonate or a carbon skeleton rearrangement, a putative 2,2-dimethylpropionyl coenzyme A mutase .
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