Examination of the active center of a (1.RAR.3)-.BETA.-D-glucanase preparation, Zymolyase.
- 1 January 1988
- journal article
- research article
- Published by Pharmaceutical Society of Japan in CHEMICAL & PHARMACEUTICAL BULLETIN
- Vol. 36 (3), 1007-1015
- https://doi.org/10.1248/cpb.36.1007
Abstract
Zymolyase is a commercially available endo-(1 .fwdarw. 3)-.beta.-D-glucanase preparation, and is widely used to lyse fungal cell walls. In this paper, the active center of this enzyme preparation was examined by using chemical modification of functional groups of amino acid residues, ultraviolet (UV) spectroscopy, optical rotation measurement and analysis of the enzymic products. First of all, chemical modifications of the amino acid residues of Zymolase, by using 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide-HCl or 1-cyclohexyl-3-(2-morpholinyl-4-ethyl)carboidiimide metho-p-toluenesulfonate for carboxyl, and N-bromosuccinimide (NBS) for tryptophan rsidues, caused the loss of (1 .fwdarw. 3)-.beta.-D-glucanase activity. These inactivations were prevented by the addition of substrate to the reaction mixture. In the presence of the substrate analogues, e.g. laminarabiose or laminaratriitol, a UV difference spectrum attributed to tryptophan residues was observed. This difference spectrum disappeared after NBS oxidation. Secondly, when the specific rotation of carboxymethylated curdlan, a linear (1 .fwdarw. 3)-.beta.-D-glucan obtained from Alcaligenes faecalis, was measured during the enzymic reaction, the value was more negative than that after mutarotation. These results suggest that carboxyl and tryptophan residues are essential to the enzyme activity and the anomeric specificity of the reducing end of the product is .beta.This publication has 28 references indexed in Scilit:
- Tryptophan Residues of Saccarifying α-Amylase from Bacillus subtilis1The Journal of Biochemistry, 1978
- Genetic analysis of products of protoplast fusion in Saccharomyces cerevisiae.The Japanese Journal of Genetics, 1978
- Fusion of Yeast ProtoplastsAgricultural and Biological Chemistry, 1977
- [46] Acylation with dicarboxylic acid anhydridesMethods in Enzymology, 1972
- [41] AcetylationMethods in Enzymology, 1972
- Reductive alkylation of amino groups in proteinsBiochemistry, 1968
- A Method for the Quantitative Modification and Estimation of Carboxylic Acid Groups in ProteinsJournal of Biological Chemistry, 1967
- FLUORESCENCE OF LYSOZYME AND LYSOZYME SUBSTRATE COMPLEXES - SEPARATION OF TRYPTOPHAN CONTRIBUTIONS BY FLUORESCENCE DIFFERENCE METHODS1967
- The Interaction of Oxidized Glutathione, Cystamine Monosulfoxide, and Tetrathionate with the —SH groups of Rabbit Muscle d-Glyceraldehyde 3-Phosphate DehydrogenaseJournal of Biological Chemistry, 1962
- A SUBMICRODETERMINATION OF GLUCOSEJournal of Biological Chemistry, 1949