Glucosylglycerate synthase (, Ggs (gene)) is an enzyme with systematic name ADP-glucose:D-glycerate 2-alpha-D-glucosyltransferase. It catalyses the following chemical reaction
The enzyme characterised from Persephonella marina transfers a glucosyl group from adenosine diphosphate glucose to D-glyceric acid, giving 2-O-(α-D-glucopyranosyl)-D-glyceric acid (glucosylglycerate), with adenosine diphosphate (ADP) as a byproduct. It has also been found in Petrotoga mobilis. In both these thermophilic organisms, the product protects againt osmotic stress.
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