||This bacterial enzyme catalyses a reaction similar to EC 18.104.22.168, amylo-α-1,6-glucosidase (one of the activities of the eukaryotic glycogen debranching enzyme). However, while EC 22.214.171.124 removes single glucose residues linked by 1,6-α-linkage, and thus requires the additional activity of 4-α-glucanotransferase (EC 126.96.36.199) to act on limit dextrins formed by glycogen phosphorylase (EC 188.8.131.52), this enzyme removes maltotriose and maltotetraose chains that are attached by 1,6-α-linkage to the limit dextrin main chain, generating a debranched limit dextrin without a need for another enzyme.
||Jeanningros, R., Creuzet-Sigal, N., Frixon, C. and Cattaneo, J. Purification and properties of a debranching enzyme from Escherichia coli. Biochim. Biophys. Acta 438 (1976) 186–199. [DOI] [PMID: 779849]
||Dauvillee, D., Kinderf, I.S., Li, Z., Kosar-Hashemi, B., Samuel, M.S., Rampling, L., Ball, S. and Morell, M.K. Role of the Escherichia coli glgX gene in glycogen metabolism. J. Bacteriol. 187 (2005) 1465–1473. [DOI] [PMID: 15687211]
||Song, H.N., Jung, T.Y., Park, J.T., Park, B.C., Myung, P.K., Boos, W., Woo, E.J. and Park, K.H. Structural rationale for the short branched substrate specificity of the glycogen debranching enzyme GlgX. Proteins 78 (2010) 1847–1855. [DOI] [PMID: 20187119]