Structural highlights
Function
[NEPU1_THEVU] Endohydrolysis of 1,4-alpha-glucosidic linkages in pullulan to form panose. Also hydrolyzes cyclodextrins.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Thermoactinomyces vulgaris R-47 produces two alpha-amylases, TVAI and TVAII, differing in substrate specificity from each other. TVAI favors high-molecular-weight substrates like starch, and scarcely hydrolyzes cyclomaltooligosaccharides (cyclodextrins) with a small cavity. TVAII favors low-molecular-weight substrates like oligosaccharides, and can efficiently hydrolyze cyclodextrins with various sized cavities. To understand the relationship between the structure and substrate specificity of these enzymes, we precisely examined the roles of key residues for substrate recognition by X-ray structural and kinetic parameter analyses of mutant enzymes and successfully obtained mutants in which the substrate specificity of each enzyme is partially converted into that of another.
Mutual conversion of substrate specificities of Thermoactinomyces vulgaris R-47 alpha-amylases TVAI and TVAII by site-directed mutagenesis.,Ohtaki A, Iguchi A, Mizuno M, Tonozuka T, Sakano Y, Kamitori S Carbohydr Res. 2003 Jul 22;338(15):1553-8. PMID:12860426[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Ohtaki A, Iguchi A, Mizuno M, Tonozuka T, Sakano Y, Kamitori S. Mutual conversion of substrate specificities of Thermoactinomyces vulgaris R-47 alpha-amylases TVAI and TVAII by site-directed mutagenesis. Carbohydr Res. 2003 Jul 22;338(15):1553-8. PMID:12860426
