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Updated: Oct 11, 2025
Generation of Null Mutants to Elucidate the Role of Bacterial Glycosyltransferases in Bacterial Motility
Published on: March 11, 2022
Cloning, expression, and characterization of a glycosaminoglycan lyase from Vibrio sp. H240
Zheng Wang1, Junhao Sun1, Yunlu Li1
1School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China; Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao 266237, PR China; Provincial Key Laboratory of Glycoscience and Glycotechnology, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China; Key Laboratory of Marine Drugs, Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China.
Abstract:
Glycosaminoglycan lyase is an effective tool for the functional studies of glycosaminoglycans and for the preparation of oligosaccharides. In this study, a new glycosaminoglycan lyase HCLaseV with a molecular weight of 90 kDa was cloned, expressed, and characterized from Vibrio sp. H240. The lyase belonged to the polysaccharide lyase (PL)- 8 family. HCLaseV showed enzyme activities toward chondroitin sulfate A, chondroitin sulfate B, chondroitin sulfate C, and hyaluronic acid. HCLaseV exhibited the highest activity against HA at pH 7.0 and 40 °C. HCLaseV was an endo-type enzyme whose degradation end-product was unsaturated disaccharides. Ca2+ inhibited the activity of HCLaseV to a certain extent, which was different from most of the enzymes in the PL-8 family. Mutagenesis studies showed that the Ca2+ inhibition might be related to the Asn244 residue. The sequence homology was evaluated by mutagenesis studies, and the catalytic residues in HCLaseV were presumed to be His278, Trp485, and Tyr287. These characteristics are helpful for further basic research and application.
