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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1996 Oct 29;93(22):12189–12194. doi: 10.1073/pnas.93.22.12189

beta-Lactamase binds to GroEL in a conformation highly protected against hydrogen/deuterium exchange.

P Gervasoni 1, W Staudenmann 1, P James 1, P Gehrig 1, A Plückthun 1
PMCID: PMC37965  PMID: 8901555

Abstract

Escherichia coli RTEM beta-lactamase reversibly forms a stable complex with GroEL, devoid of any enzymatic activity, at 48 degrees C. When beta-lactamase is diluted from this complex into denaturant solution, its unfolding rate is identical to that from the native state, while the unfolding rate from the molten globule state is too fast to be measured. Electrospray mass spectrometry shows that the rate of proton exchange in beta-lactamase in the complex at 48 degrees C is slower than in the absence of GroEL at the same temperature, and resembles the exchange of the native state at 25 degrees C. Similarly, the final number of protected deuterons is higher in the presence of GroEL than in its absence. We conclude that, for beta-lactamase, a state with significant native structure is bound to GroEL. Thus, different proteins are recognized by GroEL in very different states, ranging from totally unfolded to native-like, and this recognition may depend on which state can provide sufficient accessible hydrophobic amino acids in a suitably clustered arrangement. Reversible binding of native-like states with hydrophobic patches may be an important property of GroEL to protect the cell from aggregating protein after heat-shock.

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Selected References

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