PMID:15951418

Citation	Wang, J, Stieglitz, KA, Cardia, JP and Kantrowitz, ER (2005) Structural basis for ordered substrate binding and cooperativity in aspartate transcarbamoylase. Proc. Natl. Acad. Sci. U.S.A. 102:8881-6
Abstract	X-ray structures of aspartate transcarbamoylase in the absence and presence of the first substrate carbamoyl phosphate are reported. These two structures in conjunction with in silico docking experiments provide snapshots of critical events in the function of the enzyme. The ordered substrate binding, observed experimentally, can now be structurally explained by a conformational change induced upon the binding of carbamoyl phosphate. This induced fit dramatically alters the electrostatics of the active site, creating a binding pocket for aspartate. Upon aspartate binding, a further change in electrostatics causes a second induced fit, the domain closure. This domain closure acts as a clamp that both facilitates catalysis by approximation and also initiates the global conformational change that manifests homotropic cooperativity.
Links	PubMed PMC1157055 Online version:10.1073/pnas.0503742102
Keywords	Allosteric Regulation; Amino Acid Sequence; Aspartate Carbamoyltransferase/chemistry; Aspartate Carbamoyltransferase/metabolism; Binding Sites; Crystallography, X-Ray; Escherichia coli/enzymology; Models, Molecular; Protein Conformation; Static Electricity
edit table

Significance

You can help EcoliWiki by summarizing why this paper is useful

You can help Ecoliwiki by describing the useful materials (strains, plasmids, antibodies, etc) described in this paper.

Add links to pages that link here (e.g. gene, product, method pages)

See Help:References for how to manage references in EcoliWiki.