InterPro domain: IPR034848

This domain is found in the chloroplast-encoded phosphoglucan water dikinase (PWD), one of two enzymes involved in the phosphorylation of plant starches leading to starch turnover. PWD/GWD3 primarily catalyses phosphorylation at the C-3 position of the glucose unit of preferably pre-phosphorylated amylopectin [ 1 , 2 ]. In addition to the CBM20 domain, phosphoglucan water dikinase contains a C-terminal pyruvate binding domain [ 3 ].

1. A novel isoform of glucan, water dikinase phosphorylates pre-phosphorylated alpha-glucans and is involved in starch degradation in Arabidopsis. Plant J. 41, 595-605
2. Identification of a novel enzyme required for starch metabolism in Arabidopsis leaves. The phosphoglucan, water dikinase. Plant Physiol. 137, 242-52
3. Novel starch-related enzymes and carbohydrates. Cell. Mol. Biol. (Noisy-le-grand) 52 Suppl, OL883-904