Abstract
A hallmark of the essential cellular factors known as molecular chaperones is their ability to bind tightly to a broad spectrum of nonnative polypeptides to facilitate protein folding in vivo and in vitro under nonideal or stressful conditions (1, 16). A variety of methods have been used to assess substrate protein binding to the bacterial chaperonin GroEL qualitatively. One of the earliest and most popular approaches involves the inhibition of in vitro refolding of various model proteins, such as ribulose bis-phosphate carboxylase (4,16), citrate synthase (7, 8), rhodanese (9, 10, malate dehydrogenase (11, 13), barnase (14), and glutamine synthetase (15–17). Additional, quantitative procedures have relied on the use of size-exclusion chromatography to separate free radio- labeled proteins from those bound to GroEL (8,9, 18–20), and on the effect of nonnative proteins on the ATPase activity of GroEL (21). However, the most straightforward techniques to measure the affinity and stoichiometry of polypeptide interactions with the chaperonins accurately and precisely have involved a direct or indirect measurement of the change in the concentration of a substrate protein when it partitions to GroEL from solution. Some of these methods have relied on the heat exchanged on polypeptide binding to GroEL (22, 23), on the distribution of bound and free substrates detected by ultracen- trifugation (24, 26), and on changes in surface plasmon resonance using BIAcore (27, 29) 17). Additional, quantitative procedures have relied on the use of size-exclusion chromatography to separate free radio- labeled proteins from those bound to GroEL (8,9, 18–20), and on the effect of nonnative proteins on the ATPase activity of GroEL (21). However, the most straightforward techniques to measure the affinity and stoichiometry of polypeptide interactions with the chaperonins accurately and precisely have involved a direct or indirect measurement of the change in the concentration of a substrate protein when it partitions to GroEL from solution. Some of these methods have relied on the heat exchanged on polypeptide binding to GroEL (22, 23), on the distribution of bound and free substrates detected by ultracen- trifugation (24, 26), and on changes in surface plasmon resonance using BIAcore (27, 29)
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Hartmann, W.K., Eisenstein, E. (2000). Interaction of Nonnative Polypeptide Substrates with the Escherichia coli Chaperonin GroEL. In: Schneider, C. (eds) Chaperonin Protocols. Methods in Molecular Biology, vol 140. Humana, Totowa, NJ. https://doi.org/10.1385/1-59259-061-6:97
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DOI: https://doi.org/10.1385/1-59259-061-6:97
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