Unc45b and Hsp90: A Chaperone Complex for Myosin Folding
Author Information
Author(s): Srikakulam Rajani, Liu Li, Winkelmann Donald A.
Primary Institution: Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey
Hypothesis
Does Unc45b form a stable complex with Hsp90 and assist in the folding of the myosin motor domain?
Conclusion
Unc45b is a cytosolic protein that forms a stable complex with Hsp90, selectively binds the unfolded myosin motor domain, and promotes its folding.
Supporting Evidence
- Unc45b enhances the folding of the myosin motor domain during its synthesis.
- Unc45b forms a stable complex with Hsp90 in both muscle and non-muscle cells.
- The binding of Unc45b to the myosin motor domain is selective for its unfolded conformation.
Takeaway
Unc45b helps myosin proteins fold properly in muscle cells by working with another protein called Hsp90.
Methodology
The study involved expressing and purifying Unc45b and analyzing its interactions with Hsp90 and myosin motor domains through various biochemical assays.
Limitations
The study does not explore the effects of other potential co-chaperones or the full range of myosin isoforms.
Digital Object Identifier (DOI)
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