کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1388897 | 1500892 | 2012 | 7 صفحه PDF | دانلود رایگان |
Recombinant heparinase I was cloned from Bacteroides stercoris HJ-15 (BSrhepI), overexpressed in Escherichia coli, and intensively characterized. The complete gene of BSrhepI was identified by Southern blotting, and was overexpressed as an inclusion body. The inclusion body was solubilized with 4 M guanidine–HCl, and the denatured BSrhepI was easily purified using Ni2+-affinity column chromatography. The purified but denatured enzyme was then successfully refolded by dialysis against 50 mM Tris–HCl (pH 7.0) containing 1 mM DTT and CaCl2. BSrhepI was most active in 50 mM Tris–HCl buffer containing 300 mM NaCl, 10 mM CaCl2, and 1 mM DTT (pH 7.0) at 37 °C. This enzyme digested not only heparin, but also heparan sulfate. Through comparative HPLC-analysis of each degraded product of heparin and heparan sulfate by digestion with BSrhepI or flavobacterial heparinase I, we verified that BSrhepI has a broader spectrum of substrate specificities than other reported heparinases.
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► Heparinase I (hepI) was cloned from Bacteroides stercoris HJ-15.
► BSrhepI was then successfully overexpressed, purified and refolded.
► It has a broader spectrum of substrate specificity than other reported heparinases.
Journal: Carbohydrate Research - Volume 359, 1 October 2012, Pages 37–43