3ipn

Publication Abstract from PubMed

Preorganization is shown to endow a protein with extraordinary conformational stability. This preorganization is achieved by installing side-chain substituents that impose stereoelectronic and steric effects that restrict main-chain torsion angles. Replacing proline residues in (ProProGly)(7) collagen strands with 4-fluoroproline and 4-methylproline leads to the most stable known triple helices, having T ( m ) values that are increased by > 50 degrees C. Differential scanning calorimetry data indicate an entropic basis to the hyperstability, as expected from an origin in preorganization. Structural data at a resolution of 1.21 A reveal a prototypical triple helix with insignificant deviations to its main chain, even though 2/3 of the residues are nonnatural. Thus, preorganization of a main chain by subtle changes to side chains can confer extraordinary conformational stability upon a protein without perturbing its structure.

Stereoelectronic and steric effects in side chains preorganize a protein main chain.,Shoulders MD, Satyshur KA, Forest KT, Raines RT Proc Natl Acad Sci U S A. 2010 Jan 12;107(2):559-64. Epub 2009 Dec 31. PMID:20080719^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.