Hormone Analogues with Unique Signaling Profiles from Replacement of α-Residue Triads with β/γ Diads
作者:Ruslan Gibadullin、Tae Wook Kim、Lauren My-Linh Tran、Samuel H. Gellman
DOI:10.1021/jacs.3c06703
日期:2023.9.20
ααα→βγ replacements at sites that contained a Gly residue (i.e., at α-residue triads that presented only two side chains). All seven of the α/β/γ-peptides derived from PTH(1–34) or GLP-1(7–36) bind to the cognate receptor (the PTHR1 or the GLP-1R), but they vary considerably in their activityprofiles. Outcomes include functional mimicry of the all-α agonist, receptor-selective agonist activity, biased
Direct Catalytic Stereoselective Synthesis of C4′ Functionalized Furanoside and Nucleoside Derivatives with a Tetrasubstituted Stereocenter
作者:Kaiheng Zhang、Haibo Wu、A. Ken Inge、Armando Córdova
DOI:10.1002/adsc.202301509
日期:2024.5.21
direct entry to C4’-functionalized furanoside derivatives with a tetrasubstituted stereocenter by a novel amine-catalyzed stereoselective α-aminomethylation transformation of furanoside C5’ aldehyde derivatives 1 (Scheme 2d). However, the important generation of tetrasubstituted stereocenters is a challenging task in organic chemistry.11 Herein a novel direct catalytic stereoselective entry to C4’-functionalized
Design Strategies for the Sequence-Based Mimicry of Side-Chain Display in Protein β-Sheets by α/β-Peptides
作者:George A. Lengyel、W. Seth Horne
DOI:10.1021/ja306311r
日期:2012.9.26
The sophistication of folding patterns and functions displayed by unnatural-backbone oligomers has increased tremendously in recent years. Design strategies for the mimicry of tertiary structures seem within reach; however, a general method for the mimicry of sheet segments in the context of a folded protein is an unmet need preventing realization of this goal. Previous work has shown that 1 -> 1 alpha ->beta-residue substitutions at cross-strand positions in a hairpin-forming alpha-peptide sequence can generate an alpha/beta-peptide analogue that folds in aqueous conditions but with a change in side-chain display relative to the natural sequence; this change would prevent application of single beta-residue substitutions in a larger protein. Here, we evaluate four different substitution strategies based on replacement of alpha alpha dipeptide segments for the ability to retain both sheet folding encoded by a parent alpha-peptide sequence as well as nativelike side-chain display in the vicinity of the beta-residue insertion point. High-resolution structure determination and thermodynamic analysis of folding by multidimensional NMR suggest that three of the four designs examined are applicable to larger proteins.