Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.178103
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Funding
- NSF [IGERT DGE0114330, CAREER PHY-0349256]
- ACS [39554-AC6]
- UB Materials Research Instrument Facility
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Terahertz time domain spectroscopy shows that the protein dynamical transition, the rapid increase in protein dynamics occurring at similar to 200 K, needs neither tertiary nor secondary structure. Further, short chain alanine studies find a dynamical transition down to penta-alanine, with no transition observed for di-alanine or tri-alanine. These results reveal the temperature dependence arises strictly from the side-chain interaction with the solvent. The lack of a transition for shorter chain peptides may indicate a qualitative change in this interaction occurs at a specific peptide chain length.
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