Mucopolysaccharidases from Pseudomonas sp.

Publisher Website
Google Scholar
Abstract
Four constitutive enzymes, capable of degrading keratin sulfate, were isolated from Pseudomonas sp.: a particulate endoglycosidase, a soluble endoglycosidase, a soluble exo-.beta.-D-galactosidase and a soluble exo-.beta.-D-N-acetylglucosaminidase. The endoglycosidases were shown to act only upon keratan sulfate forming .beta.-D-2-acetamido-2-deoxy-6-O-sulfoglucosyl-(1 .fwdarw. 3)-D-galactose, as the main product. This result indicates that the enzyme catalyses the hydrolysis of .beta.-D-galactose-(1 .fwdarw. 4)-N-acetylglucosamine linkages. It was also shown that this monosulfated disaccharide inhibits the particulate keratin sulfate endoglycosidase. The bovine nucleus pulposus keratan sulfate is depolymerized at a lower rate and extent when compared to the corneal keratan sulfate. The soluble endoglycosidase is very labile, in contrast to the particulate enzyme, which has been stored at -20.degree. C or a 4.degree. C for at least 12 months with no loss in activity. The particulate endoglycosidase and the soluble exo-.beta.-D-galactosidase and exo-.beta.-D-N-acetyglucosaminidase are induced when the bacteria is grown in adaptative media containing either 0.1 % keratan sulfate or 0.1% chondroitin sulfate. Furthermore, particulate forms of the exoenzymes were detected. The soluble endoglycosidase specific activity, in contrast, is approximately the same in extracts of cells grown in glucose, keratan sulfate or chondroitin sulfate. A chondroitin sulfate lyase was also identified in the soluble extracts of Pseudomonas sp. cells. This enzyme depolymerizes chondroitin 4-sulfate, chondroitin 6-sulfate and hyaluronic acid forming unsaturated disaccharides as main products. It is also active upon the glucuronic-acid-containing regions of the dermatan sulfate molecules the properties of the soluble enzymes, further purified by ion-exchange chromatography, and of the particulate keratan sulfate endoglycosidase are presented.

This publication has 37 references indexed in Scilit: