Effect of Steric Constraint at the γ-Backbone Position on the Conformations and Hybridization Properties of PNAs.

Matthew J Crawford, Srinivas Rapireddy, Raman Bahal, Iulia Sacui, Danith H Ly

Index: J. Nucleic Acids 2011 , 652702, (2011)

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Abstract

Conformationally preorganized peptide nucleic acids (PNAs) have been synthesized through backbone modifications at the γ-position, where R = alanine, valine, isoleucine, and phenylalanine side chains. The effects of these side-chains on the conformations and hybridization properties of PNAs were determined using a combination of CD and UV-Vis spectroscopic techniques. Our results show that the γ-position can accommodate varying degrees of sterically hindered side-chains, reaffirming the bimodal function of PNAs as the true hybrids of "peptides" and "nucleic acids."