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• W2079687502 startingPage "1401" @default.
• W2079687502 abstract "We have examined the equilibrium unfolding of Escherichia coli ribonuclease HI (RNase H), a member of a family of enzymes that cleaves RNA from RNA:DNA hybrids. A completely synthetic gene was constructed that expresses a variant of the wild-type sequence with all 3 cysteines replaced with alanine. The resulting recombinant protein is active and folds reversibly. Denaturation studies monitored by circular dichroism and tryptophan fluorescence yield coincident curves that suggest the equilibrium unfolding reaction is a 2-state process. Acid denaturation, however, reveals a cooperative transition at approximately pH 1.8 to a partially folded state. This acid state can be further denatured in a reversible manner by the addition of heat or urea as monitored by either CD or tryptophan fluorescence. Analytical ultracentrifugation studies indicate that the acid state of RNase H is both compact and monomeric. Although compact, the acid state does not resemble the native protein: the acid state displays a near-UV CD spectrum similar to the unfolded state and binds to and enhances the fluorescence of the dye 1-anilinonaphthalene, 8-sulfonate much more than either the native or unfolded states. Therefore, the acid state of E. coli RNase H has the characteristics of a molten globule: it retains a high degree of secondary structure, remains compact, yet does not appear to contain a tightly packed core." @default.
• W2079687502 created "2016-06-24" @default.
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• W2079687502 date "1994-09-01" @default.
• W2079687502 modified "2023-09-27" @default.
• W2079687502 title "Equilibrium unfolding of<i>Escherichia coli</i>ribonuclease H: Characterization of a partially folded state" @default.
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• W2079687502 doi "https://doi.org/10.1002/pro.5560030906" @default.
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