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Visualizing chaperone-assisted protein folding

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.3237· OSTI ID:1379420
 [1];  [1];  [1];  [2];  [1];  [3];  [4];  [5];  [1];  [6];  [7];  [2];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Department of Molecular, Cellular, and Developmental Biology; Howard Hughes Medical Inst., Ann Arbor, MI (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States). Department of Chemistry and Biophysics Program
  3. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai Collaborative Innovation Center for Biomanufacturing, Shanghai (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Division of Biosciences
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Joint Center for Structural Genomics, Stanford Synchrotron Radiation Lightsource
  7. Univ. of Michigan, Ann Arbor, MI (United States). Department of Biological Chemistry
We present that challenges in determining the structures of heterogeneous and dynamic protein complexes have greatly hampered past efforts to obtain a mechanistic understanding of many important biological processes. One such process is chaperone-assisted protein folding. Obtaining structural ensembles of chaperone–substrate complexes would ultimately reveal how chaperones help proteins fold into their native state. To address this problem, we devised a new structural biology approach based on X-ray crystallography, termed residual electron and anomalous density (READ). READ enabled us to visualize even sparsely populated conformations of the substrate protein immunity protein 7 (Im7) in complex with the Escherichia coli chaperone Spy, and to capture a series of snapshots depicting the various folding states of Im7 bound to Spy. The ensemble shows that Spy-associated Im7 samples conformations ranging from unfolded to partially folded to native-like states and reveals how a substrate can explore its folding landscape while being bound to a chaperone.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
1379420
Alternate ID(s):
OSTI ID: 1419059
Journal Information:
Nature Structural & Molecular Biology, Journal Name: Nature Structural & Molecular Biology Journal Issue: 7 Vol. 23; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Selecting Conformational Ensembles Using Residual Electron and Anomalous Density (READ) book January 2018
Dual Role of Ribosome-Binding Domain of NAC as a Potent Suppressor of Protein Aggregation and Aging-Related Proteinopathies journal May 2019
Competing protein-protein interactions regulate binding of Hsp27 to its client protein tau journal November 2018
Protein folding while chaperone bound is dependent on weak interactions journal October 2019
Misreading chaperone–substrate complexes from random noise journal October 2018
Reply to ‘Misreading chaperone–substrate complexes from random noise’ journal October 2018
Chaperone-client interactions: Non-specificity engenders multifunctionality journal June 2017
Identifying dynamic, partially occupied residues using anomalous scattering journal November 2019
A molecular mechanism of chaperone-client recognition journal November 2016
A molecular mechanism of chaperone–client recognition text January 2016

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