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EC 2.7.9.5 Details
EC number
2.7.9.5
Accepted name
phosphoglucan, water dikinase
Reaction
ATP + [phospho-α-glucan] + H2O = AMP + O-phospho-[phospho-α-glucan] + phosphate
Other name(s)
PWD, OK1
Systematic name
ATP:phospho-α-glucan, water phosphotransferase
CAS registry number
912567-76-1
Comment
The enzyme phosphorylates granular starch that has previously been phosphorylated by EC 2.7.9.4, α-glucan, water dikinase; there is no activity with unphosphorylated glucans. It transfers the β-phosphate of ATP to the phosphoglucan, whereas the γ-phosphate is transferred to water [1]. In contrast to EC 2.7.9.4, which phosphorylates glucose groups in glucans on O-6, this enzyme phosphorylates glucose groups in phosphorylated starch on O-3 [2]. The protein phosphorylates itself with the β-phosphate of ATP, which is then transferred to the glucan [1].
History
created 2005
EC Tree
2.8.2.12 created 1972, deleted 2001
2.8.3.4 created 1961, deleted 1964