Title : Carbohydrate moiety of von Willebrand factor is not necessary for maintaining multimeric structure and ristocetin cofactor activity but protects from proteolytic degradation.

Pub. Date : 1984 Dec

PMID : 6239876






6 Functional Relationships(s)
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1 Carbohydrate moiety of von Willebrand factor is not necessary for maintaining multimeric structure and ristocetin cofactor activity but protects from proteolytic degradation. Carbohydrates von Willebrand factor Homo sapiens
2 To better define the role of carbohydrate in the structure and ristocetin cofactor activity of von Willebrand factor, we have removed up to 83% of total hexose by sequential treatment of the molecule with endo-beta-N-acetyl-glucosaminidase F (endo F), neuraminidase, and beta-galactosidase. Carbohydrates von Willebrand factor Homo sapiens
3 All multimers of unreduced carbohydrate-modified von Willebrand factor migrated more rapidly in SDS-agarose, but the triplet pattern of individual multimers was unchanged. Carbohydrates von Willebrand factor Homo sapiens
4 This suggested that carbohydrate was protecting von Willebrand factor against traces of one or more protease contaminants. Carbohydrates von Willebrand factor Homo sapiens
5 In contrast, the multimeric structure of von Willebrand factor with intact carbohydrate was not affected by plasmin under similar conditions. Carbohydrates von Willebrand factor Homo sapiens
6 These studies suggest that carbohydrate protects von Willebrand factor from disaggregation occurring secondarily to proteolytic attack but does not play a direct role in maintaining its multimeric structure or ristocetin cofactor activity. Carbohydrates von Willebrand factor Homo sapiens