Crystal Structure of the Heteromolecular Chaperone, AscE-AscG
Author Information
Author(s): Chiradip Chatterjee, Sundramurthy Kumar, Smarajit Chakraborty, Tan Yih Wan, Leung Ka Yin, Sivaraman J. Mok
Primary Institution: Department of Biological Sciences, National University of Singapore
Hypothesis
AscE acts as a chaperone of the chaperone to keep AscG in a stable but partially disordered state for interaction with AscF.
Conclusion
The N-terminal region of AscG in the AscE-AscG complex is ordered and assumes a structure similar to those in the corresponding regions of other complexes, while the C-terminal region is disordered.
Supporting Evidence
- The crystal structure was refined to a final R-factor of 0.239 at 2.4 Å resolution.
- The N-terminal region of AscG was found to be resistant to protease digestion.
- Thermal denaturation experiments indicated that the disordered region of AscG does not contribute to the thermal stability of the complex.
Takeaway
This study shows how a protein called AscE helps another protein, AscG, stay in a good shape to work properly, while part of AscG is a bit messy until it meets its partner.
Methodology
The crystal structure of the AscE-AscG1–61 complex was solved by molecular replacement and refined to a resolution of 2.4 Å.
Limitations
The study primarily focuses on the N-terminal region of AscG and does not explore the full-length protein's behavior in detail.
Digital Object Identifier (DOI)
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