ATGWD2/GWD3/PWD (PHOSPHOGLUCAN, WATER DIKINASE); ATP binding / kinase. Identical to Alpha-glucan water dikinase 2 precursor (GWD2) [Arabidopsis Thaliana] (GB:Q9STV0;GB:Q84W86); similar to SEX1 (STARCH EXCESS 1) [Arabidopsis thaliana] (TAIR:AT1G10760.1); similar to starch associated protein R1 [Solanum tuberosum] (GB:AAK11735.1); similar to Alpha-glucan water dikinase, chloroplast precursor (Starch-related R1 protein) (GB:Q9AWA5); similar to predicted protein [Physcomitrella patens subsp. patens] (GB:EDQ81852.1); contains InterPro domain Pyruvate phosphate dikinase, PEP/pyruvate-binding; (InterPro:IPR002192)