title: Effect of various acceptors on the rates of the cyclization and chain-shortening of amylose catalyzed by the cyclodextrin glycosyltransferase from Klebsiella pneumoniae M 5 al. Improvement of new photometric assay methods.
abstract: The effect of various acceptors on the cyclization and chain-shortening reaction of amylose catalyzed by cyclodextrin glycosyltransferase [(1 leads to 4)-alpha-D-glucan: [(1 leads to 4)-alpha-D-glycopyranosyl]transferase (cycling) EC 2.4.1.19] from Klebsiella pneumoniae M 5 al was studied by use of photometric-assay methods. The requirements for the acceptor were the same for both cyclization and chain-shortening, indicating the close relationship between both reactions. Maltose proved to be the most effective (2.48- and 5-fold acceleration of the cyclization and chain-shortening, respectively, in the presence of 584 micrometers maltose). The dependence of the chain-shortening reaction on the conformational state of the amylose molecules is discussed.
mesh_terms: D000688:Amylose / Q000378:metabolism*; D005964:Glucosyltransferases / Q000378:metabolism*; D007455:Iodine / Q000378:metabolism; D007700:Kinetics; D007711:Klebsiella pneumoniae / Q000201:enzymology*; D008320:Maltose / Q000378:metabolism; D009391:Nephelometry and Turbidimetry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D008320:Maltose; D000688:Amylose; D007455:Iodine; D005964:Glucosyltransferases; C019963:cyclomaltodextrin glucanotransferase