Hybridization of Pyrrolidinyl Peptide Nucleic Acids and DNA: Selectivity, Base-Pairing Specificity, and Direction of Binding
摘要:
A mixed-base, beta-amino acid containing, pyrrolidinyl peptide nucleic acid (PNA) binds strongly and selectively to complementary DNA in an exclusively antiparallel fashion. The PNA-DNA binding specificity strictly follows the Watson-Crick base-pairing rules.
branched aminoacids (Ile, Thr) with slowly hydrolyzing (6 < t < 24 h) propensities, and (iii) non-hydrolyzing ones, such as the hard-to-couple β-amino acids or β-sugar aminoacidderivatives, stable for longer times (t > 24 h) in solution. The current insight into the kinetics of this key hydrolysis side reaction serves as a guide to optimize the coupling conditions of α- and β-amino acids, thereby
DPP‐4 Cleaves α/β‐Peptide Bonds: Substrate Specificity and Half‐Lives
作者:Amila Turalić、Jasmina Đeđibegović、Zsófia Hegedüs、Tamás A. Martinek
DOI:10.1002/cbic.202000050
日期:2020.7.16
proline at the side : There is increasing interest in using α/β‐peptides as active substances in vivo, hence the investigation of their degradation patterns against enzymes with broad substrate specificity would shed light on potential metabolic routes. An important human enzyme, DPP‐4 cleaves proline‐containing α/β‐peptides with cleavage rates strongly depending on the side‐chain chemistry at the cleavage
Normal doughnuts or lots of little ones? Among four stereoisomers of a tetravalentpolyamine, the isomer pictured was the most potent at inducing DNAcompaction, whereby the DNAmolecules adopted a unique morphology of minitoroid clusters. The nonchiral polyamine spermine induced the formation of typical, larger toroidal structures.
Disclosed are polypeptide compounds containing at least one residue comprising a cyclically-constrained &ggr;-amino acid residue. The compounds have the formula
1
where A is a hydrogen, hydroxy, amino- or carboxy-protecting group, Y is a single bond or a prolyl-containing linking group, and X and Y are &ggr;-amino acid residues, provided that one of X or Y is a conformationally-restrained &ggr;-amino acid residue, and “a,” “c,” and “d” are positive integers. The compounds find use as non-enzymatically degradable probes to mimic protein behavior in solution.
Chemical shifts of artificial monomers used to construct
<scp>heterogeneous‐backbone</scp>
protein mimetics in random coil and folded states
作者:Shilpa R. Rao、Thomas W. Harmon、Shelby L. Heath、Jacob A. Wolfe、Jacqueline R. Santhouse、Gregory L. O'Brien、Alexis N. Distefano、Zachary E. Reinert、W. Seth Horne
DOI:10.1002/pep2.24297
日期:2023.3
The construction of protein-sized synthetic chains that blend natural aminoacids with artificial monomers to create so-called heterogeneous-backbones is a powerful approach to generate complex folds and functions from bio-inspired agents. A variety of techniques from structural biology commonly used to study natural proteins have been adapted to investigate folding in these entities. In NMR characterization