Journal
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
Volume 61, Issue 2, Pages 227-238Publisher
WILEY
DOI: 10.1002/prot.20592
Keywords
chondroitin; hyaluronan; hyaluronidase; mechanism of action; modeling; structure/function
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Funding
- NIAID NIH HHS [AI44078] Funding Source: Medline
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Human hyaluronidases (Hyals) are a group of five endo-beta-acetyl-hexosaminidase enzymes, Hyal-1, -2, -3, -4, and PH-20, which degrade hyaluronan using a hydrolytic mechanism of action. Catalysis by these Hyals has been shown to follow a double-displacement scheme. This involves a single G1u residue within the enzyme, the only catalytic residue, as the proton donor (acid). Also involved is a carbonyl group of the hyaluronan (HA) N-acetyl-D-glucosamine as a unique type of nucleophile. Thus the substrate participates in the mechanism of action of its own catalysis. An oxocarbonium ion transition state is postulated, but there is no formation of a covalent enzyme-glycan intermediate, as found in most such reactions. The major domain is catalytic and has a distorted (beta/alpha)(8) triose phosphate isomerase (TIM) barrel fold. The C-terminal domain is separated by a peptide linker. Each Hyal has a different C-terminal sequence and structure, the function of which is unknown. These unique C-termini may participate in the additional function(s) associated with these multifunctional enzymes.
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