Probing the equilibrium denaturation of the serpin alpha(1)-antitrypsin with single tryptophan mutants; evidence for structure in the urea unfolded state.

Abstract excerpt

The native conformation of proteins in the serpin superfamily is metastable. In order to understand why serpins attain the native state instead of more stable conformations we have begun investigations into the equilibrium-unfolding of alpha(1)-antitrypsin. alpha(1)-Antitrypsin contains two tryptophan residues, Trp194 and Trp238, situated on the A and B beta-sheets, respectively. Site-directed mutagenesis was...

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