文献类型: 外文期刊
第一作者: Wu, Sheng-Jun
作者: Wu, Sheng-Jun;Gao, Hui-Lan;Zhang, Yong-Hua;Li, Shi-Dong;Xie, Bing-Yan
作者机构:
关键词: Gliocladium catenulatum;chitinases;purification;characteristics
期刊名称:AFRICAN JOURNAL OF MICROBIOLOGY RESEARCH ( 影响因子:0.539; 五年影响因子:0.564 )
ISSN: 1996-0808
年卷期: 2012 年 6 卷 20 期
页码:
收录情况: SCI
摘要: Chitinase was isolated and purified from Gliocladium catenulatum through ammonium sulfate sedimentation, sephadex G-25 gel filtration, deionization, ultra filtration condensation, negative ion exchange separation, and non-denaturing gel electrophoresis. A 51 kDa chitinase was purified from the fungus through sodium dodecyl sulfate polyacrylamide gel electrophoresis. The optimum temperature and pH for chitinase activity were 60 degrees C and pH 6.0, respectively. The enzyme solution was stable from 20 to 40 degrees C and pH 4 to 5. Co2+ and Ca2+ were conducive to the enzyme activity, whereas the Fe3+, Cu2+, and Ag+ evidently inhibited the enzyme activity. Fe2+, Na+, K+, Zn2+, and Mn2+ showed less inhibitory effects on the enzyme activity. The K-m of the chitinase was 2.832 mg ml(-1). The chitanase were found to inhibit the hyphal growth, conidial germination and sclerotial germination of various plant pathogenic fungi.
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