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. 1993 Mar 15;90(6):2107–2111. doi: 10.1073/pnas.90.6.2107

Guanidine hydrochloride stabilization of a partially unfolded intermediate during the reversible denaturation of protein disulfide isomerase.

N A Morjana 1, B J McKeone 1, H F Gilbert 1
PMCID: PMC46034  PMID: 8460117

Abstract

The reversible denaturation of protein disulfide isomerase proceeds through intermediates that are stabilized by interaction with guanidine hydrochloride. At pH 7.5, the equilibrium denaturation by urea is completely reversible and the transition can be reasonably well-described by a two-state model involving only native and denatured forms. In comparison, the equilibrium denaturation by guanidine hydrochloride occurs in two distinct steps. In the presence of a low constant amount of guanidine hydrochloride (0.5-1.4 M), urea denaturation also becomes biphasic, suggesting the accumulation of an intermediate species that is stabilized by specific interaction with guanidine hydrochloride but not by high concentrations of other salts or other denaturants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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