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Default An NMR study of anion binding to yeast phosphoglycerate kinase.

An NMR study of anion binding to yeast phosphoglycerate kinase.

Related Articles An NMR study of anion binding to yeast phosphoglycerate kinase.

Eur J Biochem. 1990 May 31;190(1):161-9

Authors: Fairbrother WJ, Graham HC, Williams RJ

Anion binding to yeast phosphoglycerate kinase has been investigated using 1H-NMR spectroscopy. The use of anionic paramagnetic probes. [Cr(CN)6]3- and [Fe(CN)6]3-, has enabled the location of the primary anion binding site in the 'basic-patch' region of the amino-terminal domain. The anions interact most closely with Arg-65 and Arg-168. The binding of these and a variety of other anions to this site is directly competitive with the binding of the substrate, 3-phosphoglycerate. Binding of 3-phosphoglycerate and 1.3-bisphosphoglycerate is, however, stronger than expected on the basis of anionic charge and causes conformational changes in the protein not seen with any of the other simple spherical anions investigated. This must be part, at least, of the substrate specificity. Evidence for a secondary anion binding site involving the side chains of surface lysine residues is also presented. It is suggested that the primary anion site is responsible for the observed activation by anions at low concentrations while the secondary site leads to inhibition at higher anion concentrations. The kinetics fit these deductions and a scheme for kinase activity is presented.

PMID: 2194794 [PubMed - indexed for MEDLINE]



Source: PubMed
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