EC - α-glucan, water dikinase

  IntEnz view ENZYME view

IntEnz Enzyme Nomenclature


Accepted name:
α-glucan, water dikinase
Other names:
starch-related R1 protein
α-glucan,water dikinase
Systematic name:
ATP:α-glucan, water phosphotransferase




Requires Mg2+. ATP appears to be the only phosphate donor. No activity could be detected using GTP, UTP, phosphoenolpyruvate or diphosphate [1]. The protein phosphorylates glucans exclusively at O-6 of glucosyl residues [2]. The protein phosphorylates itself with the β-phosphate of ATP, which is then transferred to the glucan [1].

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
Gene Ontology: GO:0050521 , GO:0102216 , GO:0102218
CAS Registry Number: 664327-94-0


  1. Ritte, G., Lloyd, J.R., Eckermann, N., Rottmann, A., Kossmann, J. and Steup, M.
    The starch-related R1 protein is an α-glucan, water dikinase.
    Proc. Natl. Acad. Sci. USA 99 : 7166-7171 (2002). [PMID: 12011472]
  2. Ritte, G., Heydenreich, M., Mahlow, S., Haebel, S., Kötting, O., Steup, M.
    Phosphorylation of C6- and C3-positions of glucosyl residues in starch is catalysed by distinct dikinases.
    FEBS Lett. 580 : 4872-4876 (2006). [PMID: 16914145]

[EC created 2002]