Crystal structures of wild-type and mutated cyclophilin B that causes hyperelastosis cutis in the American quarter horse.

BACKGROUND:Hyperelastosis cutis is an inherited autosomal recessive connective tissue disorder. Affected horses are characterized by hyperextensible skin, scarring, and severe lesions along the back. The disorder is caused by a mutation in cyclophilin B. RESULTS:The crystal structures of both wild-type and mutated (Gly6->Arg) horse cyclophilin B are presented. The mutation neither affects the overall fold of the enzyme nor impairs the catalytic site structure. Instead, it locally rearranges the flexible N-terminal end of the polypeptide chain and also makes it more rigid. CONCLUSIONS:Interactions of the mutated cyclophilin B with a set of endoplasmic reticulum-resident proteins must be affected.

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