ADP-alpha-D-glucose + (R)-glycerate => (2R)-2-O-(alpha-D-glucopyranosyl)-glycerate + ADP + H(+)
adp-alpha-d-glucose + (r)-glycerate => (2r)-2-o-(alpha-d-glucopyranosyl)-glycerate + adp + h(+)
ADP-alpha-D-glucose + (R)-glycerate => (2R)-2-O-(alpha-D-glucopyranosyl)-glycerate + ADP + H(+)
adp-alpha-d-glucose + (r)-glycerate => (2r)-2-o-(alpha-d-glucopyranosyl)-glycerate + adp + h(+)