The Mechanical Fingerprint of a Parallel Polyprotein Dimer.
Biophysical journal
- Publish Date: Feb 2007
- ISSN: 0006-3495
- Volume: 92
- Issue: 4
- Pages: L36-8
- Medium: Print
- Language: English
- Citation (JAMA): Sarkar Atom, Caamano Sofia, Fernandez Julio M, et al. The Mechanical Fingerprint of a Parallel Polyprotein Dimer.. Biophys. J. Feb 2007;92:L36-8
Abstract
We use the GCN4 oligomerization domain to engineer a covalently linked parallel polyprotein dimer based on the well-studied I27 domain of titin. We use single molecule atomic force microscopy techniques to stretch single polyprotein fibers and verify their mechanical properties. We find that the engineered polyprotein dimers extend in perfect register, doubling the unfolding force and halving the persistence length while keeping the contour length increase unchanged. These experiments directly confirm the mechanical scaling laws proposed for parallel bundles of modular proteins.
Mesh Headings (Keywords): Biomechanics, Dimerization, Microscopy, Atomic Force, Muscle Proteins, Polyproteins, Protein Kinases, Protein Structure, Tertiary
Check for Full Text / PubMed Unique Identifier (PMID): 17158577
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