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Solution structure and dynamics of the bioactive retroviral M domain from Rous sarcoma virus
J M McDonnell1, D Fushman, S M Cahill
1The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
Abstract:
A biologically active construct of the retroviral M domain from the avian Rous sarcoma virus is defined and its solution structure described. This M domain is fully active in budding and infectivity without myristylation. In spite of a sequence homology level that suggests no relationship among M domains and the family of matrix proteins in mammalian retroviruses, the conserved structural elements of a central core allow an M domain sequence motif to be described for all retroviruses. The surface of the M domain has a highly clustered positive patch comprised of sequentially distant residues. An analysis of the backbone dynamics, incorporating rotational anisotropy, is used to estimate the thermodynamics of proposed domain oligomerization.
Insights
Researchers defined the structure and function of the avian Rous sarcoma virus M domain, finding it active in budding and infectivity without myristylation. A conserved motif suggests a common evolutionary origin for retroviral matrix proteins.
Area of Science:
- Virology
- Structural Biology
- Biochemistry
Background:
- The retroviral M domain is crucial for viral particle assembly and infectivity.
- Understanding its structure-function relationship is key to developing antiviral strategies.
Purpose of the Study:
- To define the biologically active M domain construct from avian Rous sarcoma virus (ASV).
- To elucidate the solution structure of the ASV M domain.
- To identify conserved structural elements and sequence motifs across retroviral M domains.
Main Methods:
- Biologically active M domain construct preparation.
- Solution structure determination using NMR spectroscopy.
- Analysis of backbone dynamics and rotational anisotropy.
Main Results:
- The ASV M domain is fully active in budding and infectivity without myristylation.
- A conserved structural core allows for a universal M domain sequence motif across retroviruses, despite low sequence homology.
- A highly clustered positive surface patch was identified, potentially involved in protein-protein interactions.
Conclusions:
- The ASV M domain structure provides insights into retroviral assembly mechanisms.
- A conserved M domain motif suggests a shared evolutionary origin for matrix proteins in diverse retroviruses.
- Thermodynamic analysis of domain oligomerization offers potential targets for antiviral drug development.