Tailored Peptide Phenyl Esters Block ClpXP Proteolysis by an Unusual Breakdown into a Heptamer–Hexamer Assembly
作者:Markus Lakemeyer、Eva Bertosin、Friederike Möller、Dóra Balogh、Ralf Strasser、Hendrik Dietz、Stephan A. Sieber
DOI:10.1002/anie.201901056
日期:2019.5.20
binding of probes arrested ClpXP in an unprecedented heptamer–hexamer assembly, in which the two heptameric ClpP rings are dissociated from each other. At the same time, the affinity between ClpX and ClpP increased, leading to inhibition of both enzymes. This conformationalarrest is beneficial for the consolidated shutdown of ClpXP, as well as for the study of the oligomeric state during its catalytic
A series of Ala and Aoc analogues of (-)-ternatin were prepared, and their bioactivities were assessed by a fat-accumulation inhibition assay using 3T3-L1 adipocytes, which led to the discovery of key structure-activity relationships (SAR).
Synthesis and in vitro evaluation of a library of modified endomorphin 1 peptides
作者:Yasuko Koda、Mark Del Borgo、Susanne T. Wessling、Lawrence H. Lazarus、Yoshio Okada、Istvan Toth、Joanne T. Blanchfield
DOI:10.1016/j.bmc.2008.04.020
日期:2008.6
Endomorphin 1 (Endo-1 = Tyr-Pro-Trp-Phe-NH(2)), an endogenous opioid with high affinity and selectivity for mu-opioid receptors, mediates acute and neuropathic pain in rodents. To overcome metabolic instability and poor membrane permeability, the N- and C-termini of Endo-1 were modified by lipoamino acids (Laa) and/or sugars, and 2',6'-dimethyltyrosine (Dmt) replacement of Tyr. Analogues were assessed for mu-opioid receptor affinity, inhibition of cAMP accumulation, enzymatic stability, and permeability across Caco-2 cell monolayers. C-Terminus modi. cation decreased receptor affinity, while N-terminus C8-Laa improved stability and permeability with slight change in receptor affinity. Dmt provided a promising lead compound: [C8Laa-Dmt[1]]-Endo-1 is nine times more stable (t(1/2) = 43.5 min), >8- fold more permeable in Caco-2 cell monolayers, and exhibits 140-fold greater mu-opioid receptor affinity (K(i mu) = 0.08 nM). (C) 2008 Elsevier Ltd. All rights reserved.