کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
25288 | 43564 | 2007 | 11 صفحه PDF | دانلود رایگان |
The Chryseobacterium sp. kr6 strain has been described as a highly keratinolytic bacterium showing effective feather-degrading and de-hairing activities. A keratinase Q1 enzyme was purified from Chryseobacterium sp. kr6 culture by Phenyl Sepharose and Superose 12HR chromatography. This enzyme showed a specific activity of 967 U/mg for keratin azure. Electrophoresis under denaturing conditions showed a monomeric protein with approximately 64 kDa. The enzyme showed pH and temperature optima of 8.5 and 50 °C, respectively. The inhibitory effect of EDTA, EGTA and 1,10-phenanthroline characterized Q1 enzyme as a Zn-metalloprotease. Its activity was increased by three-fold in the presence of Ca2+. ESI-MS/MS analysis of peptides generated from a tryptic digestion revealed sequence homology which may characterize the Q1 keratinase as a member of the M14 metalloprotease family, with a consensus glycosylation region similar to proteins from Chryseobacerium meningosepticum.
Journal: Journal of Biotechnology - Volume 128, Issue 3, 20 February 2007, Pages 693–703