Identification, characterization and functional analysis of a GH-18 chitinase from Streptomyces roseolus
| Autor: | Shuming Zou, Daochun Chen, Weifen Wang, Jiang Xia-yun, Shunshen Chen, Hong Shenle |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry Protein domain Biology biology.organism_classification Streptomyces Chitosan chemistry.chemical_compound Enzyme chemistry Chitin Biochemistry Chitinase Materials Chemistry Streptomyces roseolus biology.protein Glycoside hydrolase |
| Zdroj: | Carbohydrate Polymers. 87:2409-2415 |
| ISSN: | 0144-8617 |
| Popis: | A 40 kDa chitinase from Streptomyces roseolus DH was purified to homogeneity from culture medium. The N-terminal sequence was TPPPAKAVKLGYFTNWGVYG, which was highly homologous to the glycoside hydrolase (GH) 18 conserved domain of Streptomyces chitinases and included the two crucial Trp and Tyr sites. The purified enzyme showed maximal activity at 60 °C, pH 6.0 and exhibited good thermal and pH stabilities. The enzyme displayed strict substrate specificity on colloidal or glycol chitin, but not on chitosan derivatives. It was activated by Mg2+, Ba2+ and Ca2+, and inhibited by Cu2+, Co2+, Mn2+, whereas Zn2+ and ethylenediamine tetraacetic acid showed little inhibitory effects. Morphological changes observed by scanning electron microscopy revealed the occurrence of regular pores on the surface with the progress of enzymatic chitinolysis. Additionally, this GH-18 chitinase had a marked inhibitory effect on fungal hyphal extensions. In conclusion, this chitinase may have great potential for the enzymatic degradation of chitin. |
| Databáze: | OpenAIRE |
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