Chemoselective Peptide Ligation-Desulfurization at Aspartate
作者:Robert E. Thompson、Bun Chan、Leo Radom、Katrina A. Jolliffe、Richard J. Payne
DOI:10.1002/anie.201304793
日期:2013.9.9
Asp‐ecially useful: A synthetic β‐mercapto aspartate residue facilitates the rapid ligation to a range of peptide thioesters. Following the ligation reaction (and without purification), chemoselective desulfurization of the β‐mercapto moiety in the presence of unprotected cysteine residues afforded native peptide products.
The invention relates to a process for introducing a thiol group a to a carbonyl group in a side chain of a protected a-amino acid, said protected a-amino acid having protecting groups on both the α-amine group and the a-carboxyl group. The process comprises a) if the side chain contains a functional group comprising a heteroatom bearing a hydrogen atom, protecting said functional group; b) treating the protected amino acid with a base of sufficient strength to abstract a hydrogen atom a to the carbonyl group, so as to form an anion; c) treating the anion with a reagent of structure Pr-S-L in which L is a leaving group and Pr is a thiol-protecting group, so as to introduce a Pr-S- group a to the carbonyl group; and d) converting the Pr-S- group to an H-S-(thiol) group. This process may be used to prepare ligated peptides.
Potent Cyclic Tetrapeptide for Lead Detoxification
作者:Tagwa A. Mohammed、Christoph M. Meier、Tadeáš Kalvoda、Martina Kalt、Lubomír Rulíšek、Michal S. Shoshan
DOI:10.1002/anie.202103217
日期:2021.5.25
Lead (Pb) is a ubiquitous poisonous metal, affecting the health of vast populations worldwide. Medications to treat Pb poisoning suffer from various limitations and are often toxic owing to insufficient metal selectivity. Here, we report a cyclictetrapeptide that selectively binds Pb and eradicates its toxic effect on the cellular level, with superior potency than state‐of‐the‐art drugs. The Pb‐peptide
Accelerated Protein Synthesis via One-Pot Ligation-Deselenization Chemistry
作者:Nicholas J. Mitchell、Jessica Sayers、Sameer S. Kulkarni、Daniel Clayton、Anna M. Goldys、Jorge Ripoll-Rozada、Pedro José Barbosa Pereira、Bun Chan、Leo Radom、Richard J. Payne
DOI:10.1016/j.chempr.2017.04.003
日期:2017.5
Peptide ligation chemistry has revolutionized protein science by facilitating access to synthetic proteins. Here, we describe the development of additive-free ligation-deselenization chemistry at β-selenoaspartate and γ-selenoglutamate that enables the generation of native polypeptide products on unprecedented timescales. The deselenization step is chemoselective in the presence of unprotected selenocysteine
Head-to-tail cyclization and use of Cα-allyl ester protection improves the yield of cyclic peptides synthesized by the oxime resin method
作者:Afrodite Kapurniotu、John W. Taylor
DOI:10.1016/s0040-4039(00)61589-7
日期:1993.10
Fully protected and C-terminal free cyclic (lactam-bridged) peptides are assembled by the oxime resin method in high yields and purity applying a four dimensional orthogonal (Boc/Bzl/Fmoc/Al) protection scheme and a head-to-tail cyclization strategy.