title: Reciprocity of steric and stereoelectronic effects in the collagen triple helix.
abstract: In previous work, we demonstrated that 4-fluoroproline residues can contribute greatly to the conformational stability of the collagen triple helix, and that this stability arises from stereoelectronic effects that fix the pucker of the pyrrolidine ring and thereby preorganize the backbone properly for triple-helix formation. Here, we take a reciprocal approach, demonstrating that the steric effect of a 4-methyl group confers stability similar to that from a 4-fluoro group in the opposite configuration. Such fundamental interplay between steric and stereoelectronic effects is heretofore unknown in proteins-natural or synthetic-and provides a new means to modulate conformational stability.
authors.affiliation: Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Shoulders
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Hodges
authors.forename: Ronald T
authors.initials: RT
authors.lastname: Raines
mesh_terms: D000595:Amino Acid Sequence; D002942:Circular Dichroism; D003094:Collagen / Q000737:chemistry*; D008969:Molecular Sequence Data; D011487:Protein Conformation; D013237:Stereoisomerism
chemical_list: D003094:Collagen