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Origins of structure in globular proteins
1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143.
Summary
Protein folding relies on steric constraints, not just nonspecific forces. Polymers naturally form secondary structures like helices and sheets when driven to compact states, explaining protein architecture.
Area of Science:
- Biophysics
- Polymer Science
- Structural Biology
Background:
- Nonspecific forces like hydrophobicity and conformational entropy are primary drivers of protein folding.
- A key question in structural biology is what specific forces dictate the internal architecture of globular proteins.
Purpose of the Study:
- To investigate the forces driving the formation of specific internal architectures in globular proteins.
- To explore the role of steric constraints in protein structure formation.
Main Methods:
- Investigated self-avoiding flexible polymer molecules driven to increasing compactness by attractive forces.
- Analyzed the development of secondary structures (helices, sheets) under steric constraints.
Main Results:
- Self-avoiding flexible polymers develop significant secondary structure (helices, sheets) when driven to compact states.
- Steric constraints in compact polymers are a primary source of structural organization.
- This principle explains the stability of helices and sheets in globular proteins and residual structure in unfolded proteins.
Conclusions:
- Protein structure formation is significantly influenced by steric principles arising from polymer compactness.
- It may be possible to design copolymers that self-assemble into protein-like structures in incompatible solvents.