Insights into the biochemical and genetic basis of glucokinase activation from naturally occurring hypoglycemia mutations.
Glucokinase (GCK) is a key regulatory enzyme in the pancreatic beta-cell and catalyzes the rate-limiting step for beta-cell glucose metabolism. We report two novel GCK mutations (T65I and W99R) that have arisen de novo in two families with familial hypoglycemia. Insulin levels, although inappropriately high for the degree of hypoglycemia, remain regulated by fluctuations in glycemia, and pancreatic histology was normal. These mutations are within the recently identified heterotropic allosteri...Expand abstract
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