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. 1994 Oct;3(10):1726–1730. doi: 10.1002/pro.5560031011

Electrostatic effects in the control of glycogen phosphorylase by phosphorylation.

L N Johnson 1, D Barford 1
PMCID: PMC2142624  PMID: 7849589

Abstract

Electrostatic effects are important in the initial activation mechanism of glycogen phosphorylase by phosphorylation. Analysis of the electrostatic surface potential of glycogen phosphorylase with the program GRASP shows that in the unphosphorylated state, the N-terminal 20 residues, which include a number of basic amino acids, are located close to a position on the surface of the molecule that is highly acidic. Upon phosphorylation by phosphorylase kinase at Ser 14, the N-terminal residues change their position and conformation so that the Ser-P is directed away from the acidic patch and to an intersubunit site where 2 arginines bind the phosphate. This recognition site is created through tertiary and quaternary structural changes that accompany the activation mechanism.

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Selected References

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