Journal
ACS CENTRAL SCIENCE
Volume 2, Issue 11, Pages 812-819Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.6b00205
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Funding
- Biomaterials Program of the U.S. National Science Foundation [DMR-1506483]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1506483] Funding Source: National Science Foundation
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The dynamic behavior of macromolecular networks dominates the mechanical properties of soft materials and influences biological processes at multiple length scales. In hydrogels prepared from self-assembling artificial proteins, stress relaxation and energy dissipation arise from the transient character of physical network junctions. Here we show that subtle changes in sequence can be used to program the relaxation behavior of end-linked networks of engineered coiled-coil proteins. Single-site substitutions in the coiled-coil domains caused shifts in relaxation time over 5 orders of magnitude as demonstrated by dynamic oscillatory shear rheometry and stress relaxation measurements. Networks with multiple relaxation time scales were also engineered. This work demonstrates how time-dependent mechanical responses of macromolecular materials can be encoded in genetic information.
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