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Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology
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Common Patterns in Chaperone Interactions with a Native Client Protein.

Lichun He1, Sebastian Hiller1

  • 1Biozentrum, University of Basel, Klingelbergstrasse 70, 4056, Basel, Switzerland.

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|March 3, 2018
PubMed
Summary
This summary is machine-generated.

Molecular chaperones like Spy, SurA, and Skp interact with native client proteins by recognizing "frustrated" surface segments. This dynamic recognition explains how chaperones can bind to diverse protein structures.

Keywords:
NMR spectroscopychaperonesmolecular recognitionprotein structuresprotein-protein interactions

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Dynamics

Background:

  • Molecular chaperones assist protein folding but their interaction with diverse native client proteins remains unclear.
  • Understanding chaperone-native client interactions is key to explaining chaperone promiscuity.

Purpose of the Study:

  • To investigate the atomic-level interactions between three ATP-independent chaperones and the Fyn SH3 domain.
  • To elucidate the mechanism of chaperone recognition for native client proteins.

Main Methods:

  • Atomic-level investigation of chaperone-client protein interactions.
  • Utilizing the Fyn SH3 domain as a model β-sheet-rich client protein.

Main Results:

  • The chaperone Spy recognizes a locally "frustrated" surface on the Fyn SH3 domain.
  • Interactions are transient and dynamic, maintaining client protein solvent accessibility.
  • Alternative chaperones SurA and Skp also recognize the same frustrated surface on Fyn SH3.

Conclusions:

  • Dynamic recognition of frustrated protein segments is a common mechanism for chaperone-native client interactions.
  • This mechanism provides insight into the promiscuous binding capabilities of molecular chaperones.