… Proline is unique among the 20 genetically coded amino acids. (1) The … structures known
as poly proline helices of type-I (all-cis right handed, PP-I) or type-II (all-trans left handed, PP-II), …

… unique conformational behaviors. First, it is known that oligo- and poly-(l-proline) form two
unique helices, named polyproline… charge-dipole interaction in the compact structure of PP-I. …

… non-local interactions within compact or globular conformations or … state rather than the
secondary structure of the entire or a … ensembles of glycine residues are rare. Graf et al. explored …

… structure of an oligoproline adopting an all-trans polyproline … This unique property is a reason
for PPII conformation to … The compactness and inherent flexibility of the PPII conformation is …

… such as trifluoroethanol but prefers a more compact right-handed PPI helical geometry in
less-… were unique PPII helical chains of different lengths (Figure 5A). The structural parameters …

… associated with the unique three-dimensional structure of folded … formation of alternative
local structural elements. In particular… secondary structural elements referred to as polyproline II (…

… The anhydrous triglycine structure was found to have two … similar environments in other crystal
structures. The O8 is one … conformation of triglycine is a compact conformation, rather than …

… An oligomeric proline forms two types of helices, compact polyproline-I and extended … of
the P II helical structure to changing media. The use of oligo-Oic provides a unique opportunity, …

… Nuclear magnetic resonance (NMR) is a unique tool to characterize the structure and
dynamics of proteins at atomic resolution. Most methods used in the study of biomolecules rely on …

… , polyproline peptide has a unique left-handed helix structure known as polyproline type II
helix … The transformation from PPII to the more compact PPI helix completely changes the helix …