INVESTIGADORES
IGLESIAS Alberto Alvaro
artículos
Título:
A Novel Dual Allosteric Activation Mechanism of Escherichia coli ADP-glucose Pyrophosphorylase: The role of pyruvate
Autor/es:
M.D. ASENCIÓN DIEZ; M.C. ALEANZI; A.A. IGLESIAS; M.A. BALLICORA
Revista:
PLOS ONE
Editorial:
PUBLIC LIBRARY SCIENCE
Referencias:
Lugar: San Francisco; Año: 2014 vol. 9 p. 103888 - 103888
ISSN:
1932-6203
Resumen:
Fructose-1,6-bisphosphate activates ADP-glucose pyrophosphorylase and the synthesis of glycogen in Escherichia coli. Here, we show that although pyruvate is a weak activator by itself, it synergically enhances the fructose-1,6-bisphosphate activation. They increase the enzyme affinity for each other, and the combination increases Vmax, substrate apparent affinity, and decreases AMP inhibition. Our results indicate that there are two distinct interacting allosteric sites for activation. Hence, pyruvate modulates E. coli glycogen metabolism by orchestrating a functional network of allosteric regulators. We postulate that this novel dual activator mechanism increases the evolvability of ADP-glucose pyrophosphorylase and its related metabolic control.
