5.4.2.7 D156A site-directed mutagenesis, the D156A variant displays a dramatically reduced level of phosphorylation of the active site Thr85 compared to the wild-type, and does not acquire phosphatase activity -, 726977 5.4.2.7 K240A site-directed mutagenesis, the K240A variant can be phosphorylated by the small molecule activator glucose 1,6-bisphosphate like the wild-type enzyme -, 726977 5.4.2.7 T85E site-directed mutagenesis, the T85E variant mimics the active site charge of the activated state of the enzyme, the affinity for activator glucose 1,6-bisphosphate is 4.5fold reduced compared to the wild-type enzyme -, 726977 5.4.2.7 T85Q site-directed mutagenesis, the T85Q variant mimics the active site charge of the unactivated state of the enzyme, the affinity for activator glucose 1,6-bisphosphate is only slightly reduced compared to the wild-type enzyme -, 726977