Stapling of two PEGylated side chains increases the conformational stability of the WW domain via an entropic effect.

ABSTRACT: Hydrocarbon stapling and PEGylation are distinct strategies for enhancing the conformational stability and/or pharmacokinetic properties of peptide and protein drugs. Here we combine these approaches by incorporating asparagine-linked O-allyl PEG oligomers at two positions within the β-sheet protein WW, followed by stapling of the PEGs via olefin metathesis. The impact of stapling two sites that are close in primary sequence is small relative to the impact of PEGylation alone and depends strongly on PEG length. In contrast, stapling of two PEGs that are far apart in primary sequence but close in tertiary structure provides substantially more stabilization, derived mostly from an entropic effect. Comparison of PEGylation + stapling vs. alkylation + stapling at the same positions in WW revea

SUBMITTER: Xiao Q 

PROVIDER: S-EPMC6290918 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature