Unfolding rates of globular proteins determined by kinetics of proteolysis

Taiji Imoto, Hidenori Yamada, Tadashi Ueda

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Abstract

A convenient method for the determination of unfolding rates of small globular proteins under physiological conditions was developed using digestion with proteases. The apparent first-order rate constants for digestion of lysozyme with thermolysin and with Pronase at pH 8 and 50 °C were shown to be saturated with increases of concentrations of these proteases. The maximum rate constants extrapolated were identical in digestions with two different proteases, and were found to be equal to the unfolding rate constant of lysozyme. Similarly, the unfolding rate constant of RNase A at pH 8 and 50 °C, and those of lysozyme, RNase A and β-lactoglobulin at pH 8 and 40 °C, were determined by the digestion method. Thus, it was shown that digestion by proteases proceeds mainly via the unfolded state of proteins.

Original languageEnglish
Pages (from-to)647-649
Number of pages3
JournalJournal of Molecular Biology
Volume190
Issue number4
DOIs
Publication statusPublished - Aug 20 1986

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All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Molecular Biology

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