Cloning and Characterization of a Chondroitin AC Exolyase from Arthrobacter sp. SD-04.
Glycosaminoglycans (GAGs) and their low-molecular weight derivates have received considerable interest in terms of their potential clinical applications, and display a wide variety of pharmacological and pharmacokinetic properties. Structurally distinct GAG chains can be prepared by enzymatic depolymerization. A variety of bacterial chondroitin sulfate (CS) lyases have been identified, and have been widely used as catalysts in this process. Here, we identified a putative chondroitin AC exolyase gene, AschnAC, from an Arthrobacter sp. strain found in a CS manufacturing workshop. We expressed the enzyme, AsChnAC, recombinantly in Escherichia coli, then purified and characterized it in vitro. The enzyme indeed displayed exolytic cleavage activity toward HA and various CSs. Removing the putative N-terminal secretion signal peptide of AsChnAC improved its expression level in E. coli while maintaining chondroitin AC exolyase activity. This novel catalyst exhibited its optimal activity in the absence of added metal ions. AsChnAC has potential applications in preparation of low-molecular weight GAGs, making it an attractive catalyst for further investigation.
['Chen|Lu-Zhou|LZ|', 'Shi|Chu-Qi|CQ|', 'Yin|Feng-Xin|FX|', 'Wang|Feng-Shan|FS|', 'Sheng|Ju-Zheng|JZ|http://orcid.org/0000-0003-2856-9162']
D001173:Arthrobacter D001426:Bacterial Proteins D055162:Biocatalysis D002808:Chondroitin Lyases D003001:Cloning, Molecular D004926:Escherichia coli D006025:Glycosaminoglycans D008970:Molecular Weight D011994:Recombinant Proteins
Chondroitin AC exolyase Arthrobacter sp. Glycosaminoglycan Chondroitin sulfate Escherichia coli Enzymatic characterization Substrate specificity