University of Illinois Urbana-Champaign

Transmembrane Signaling in Bacillus Subtilis Chemotaxis: Determination of the Packing Organization and Structural Changes of McpB in Response to Ligand

Bunn, Michael Wade

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Description

Title
Transmembrane Signaling in Bacillus Subtilis Chemotaxis: Determination of the Packing Organization and Structural Changes of McpB in Response to Ligand
Author(s)
Bunn, Michael Wade
Issue Date
2003
Doctoral Committee Chair(s)
Ordal, George W.
Department of Study
Biochemistry
Discipline
Biochemistry
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Molecular
Language
eng
Abstract
"In Chapter 5, we investigated the complementation and activity of a methylesterase phosphorylation point mutant, C-terminal truncated mutant, and a serine active site mutant in vivo to the attractant asparagine to determine the role CheB phosphorylation plays in regulation of receptor demethylation events. Phosphorylation was required for normal methylesterase activity and complementation in vivo; however, enhanced methanol formation occurred briefly without activation of CheB. Therefore, demethylation must involve a hyperactive receptor transition state between ligand free ""relaxed"" states and ligand bound ""adapted"" states. We speculated that the hypersensitive receptor transition is an intrinsic property of receptors which is independent of ""receptor clustering"" or CheB phosphorylation."
Graduation Semester
2003
Type of Resource
text
Permalink
http://hdl.handle.net/2142/84796

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