Journal
SCIENCE
Volume 327, Issue 5965, Pages 555-559Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1182340
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Funding
- U.S. Department of Energy [DE-FG02-00ER45810]
- E. I. DuPont de Nemours and Company
- Dow Chemical Company
- state of Illinois
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NIH National Institute of Dental and Craniofacial Research [5R01 DE015920]
- NSF [DMR-0605427]
- U.S. Department of Energy (DOE) [DE-FG02-00ER45810] Funding Source: U.S. Department of Energy (DOE)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006713] Funding Source: National Science Foundation
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We report here crystallization at long range in networks of like-charge supramolecular peptide filaments mediated by repulsive forces. The crystallization is spontaneous beyond a given concentration of the molecules that form the filaments but can be triggered by x-rays at lower concentrations. The crystalline domains formed by x-ray irradiation, with interfilament separations of up to 320 angstroms, can be stable for hours after the beam is turned off, and ions that screen charges on the filaments suppress ordering. We hypothesize that the stability of crystalline domains emerges from a balance of repulsive tensions linked to native or x-ray-induced charges and the mechanical compressive entrapment of filaments within a network. Similar phenomena may occur naturally in the cytoskeleton of cells and, if induced externally in biological or artificial systems, lead to possible biomedical and lithographic functions.
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