Loading…

The halo-substituent effect on Pseudomonas cepacia lipase-mediated regioselective acylation of nucleosides: A comparative investigation

•Nucleosides possessing different halogen atoms could be successfully converted into their corresponding esters derivatives catalyzed by PCL lipase.•The physicochemical properties of the halo-substituents in nucleosides profoundly influenced the enzyme’s behavior.•The position (2′- vs. 5-position) o...

Full description

Saved in:
Bibliographic Details
Published in:Journal of biotechnology 2015-10, Vol.212, p.153-158
Main Authors: Wang, Zhao-Yu, Bi, Yan-Hong, Yang, Rong-Ling, Duan, Zhang-Qun, Nie, Ling-Hong, Li, Xiang-Qian, Zong, Min-Hua, Wu, Jie
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Nucleosides possessing different halogen atoms could be successfully converted into their corresponding esters derivatives catalyzed by PCL lipase.•The physicochemical properties of the halo-substituents in nucleosides profoundly influenced the enzyme’s behavior.•The position (2′- vs. 5-position) of the substituents was also found to be another vital factor for all acylations.•PCL exhibited the highest 3′-regioselectivity toward the long-chain vinyl donor (C14) as compared to shorter (C10 and C6) ones. In this work, comparative experiments were explored to investigate the substrate specificity of Pseudomonas cepacia lipase in regioselective acylation of nucleosides carrying various substituents (such as the H, F, Cl, Br, I) at 2′- and 5-positions. Experimental data indicated that the catalytic performance of the enzyme depended very much on the halo-substituents in nucleosides. The increased bulk of 2′-substituents in ribose moiety of the nucleoside might contribute to the improved 3′-regioselectivity (90–98%, nucleosides a–d) in enzymatic decanoylation, while the enhancement of regioselectivity (93–99%) in 3′-O-acylated nucleosides e–h could be attributable to the increasing hydrophobicity of the halogen atoms at 5-positions. With regard to the chain-length selectivity, P. cepacia lipase displayed the highest 3′-regioselectivity toward the longer chain (C14) as compared to shorter (C6 and C10) ones. The position, orientation and property of the substituent, specific structure of the lipase’s active site, and acyl structure could account for the diverse results.
ISSN:0168-1656
1873-4863
DOI:10.1016/j.jbiotec.2015.08.027