title: Nucleation and stability of hydrogen-bond surrogate-based alpha-helices.
abstract: We have reported a new class of artificial alpha-helices in which a pre-organized alpha-turn nucleates the helical conformation [R. N. Chapman, G. Dimartino, and P. S. Arora, J Am. Chem. Soc., 2004, 126, 12252 and D. Wang, K. Chen, J. L. Kulp, III, and P. S. Arora, J. Am. Chem. Soc., 2006, 128, 9248]. This manuscript describes the effect of the core nucleation template on the overall helicity of the peptides and demonstrates that the macrocycle which most closely mimics the 13-membered hydrogen-bonded alpha-turn in canonical alpha-helices also affords the most stable artificial alpha-helix. We also investigate the stability of these synthetic helices through classical helix-coil parameters and find that the denaturation behavior of HBS alpha-helices agrees with the theoretical properties of a peptide with a well-defined and stable helix nucleus.
authors.affiliation: Department of Chemistry, New York University, New York, NY 10003, USA.
authors.forename: Deyun
authors.initials: D
authors.lastname: Wang
authors.forename: Kang
authors.initials: K
authors.lastname: Chen
authors.forename: Gianluca
authors.initials: G
authors.lastname: Dimartino
authors.forename: Paramjit S
authors.initials: PS
authors.lastname: Arora
mesh_terms: D002942:Circular Dichroism; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008968:Molecular Conformation; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry; D011489:Protein Denaturation; D017433:Protein Structure, Secondary; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013696:Temperature
chemical_list: D010455:Peptides