A novel esterase from Bacillus subtilis (RRL 1789): purification and characterization of the enzyme |
| |
Authors: | Kaiser Peerzada Raina Chand Parshad Rajinder Johri Sarojini Verma Vijeshwer Andrabi Khurshid I Qazi Ghulam N |
| |
Institution: | Regional Research Laboratory, Canal Road, Jammu Tawi-180001, India. |
| |
Abstract: | An esterase (EC 3.1.1.1) produced by an isolated strain of Bacillus subtilis RRL 1789 exhibited moderate to high enantioselectivity in the kinetic resolution of several substrates like aryl carbinols, hydroxy esters, and halo esters. The enzyme named as B. subtilis esterase (BSE), was purified to >95% purity with a specific activity of 944 U/mg protein and 12% overall yield. The purified enzyme is approximately 52 kDa monomer, maximally activity at 37 degrees C and pH 8.0 and fairly stable up to 55 degrees C. The enzyme does not exhibit the phenomenon of interfacial activation with tributyrin and p-nitrophenyl butyrate beyond the saturation concentration. The enzyme showed preference for triacyglycerols and esters of p-nitrophenol with short chain fatty acid. Presence of Ca2+ ions increases the activity of enzyme by approximately 20% but its presence does not have any influence on the thermostability of the enzyme. The enzyme is not a metalloprotein and belongs to the family of serine proteases. The N-terminal amino acid sequence of BSE determined, as Met-Thr-Pro-Glu-Iso-Val-Thr-Thr-Glu-Tyr-Gly- revealed similarity with the N-terminal amino acid sequence of p-nitrobenzylesterase of B. subtilis. |
| |
Keywords: | Enantioselective Esterase Purification Serine protease |
本文献已被 ScienceDirect PubMed 等数据库收录! |