Selectivity profiling of DegP substrates and inhibitors
摘要:
Protein quality control factors are involved in many key physiological processes and severe human diseases that are based on misfolding or amyloid formation. Prokaryotic representatives are often virulence factors of pathogenic bacteria. Therefore, protein quality control factors represent a novel class of drug targets. The bacterial serine protease DegP, belonging to the widely conserved family of HtrA proteases, exhibits unusual structural and functional plasticity that could be exploited by small molecule modulators. However, only one weak synthetic peptide substrate and no inhibitors are available to date. We report the identification of a potent heptameric pNA-substrate and chloromethyl ketone based inhibitors of DegP. In addition, specificity profiling resulted in the identification of one strong inhibitor and a potent substrate for subtilisin as well as a number of specific elastase substrates and inhibitors. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of peptide chloromethyl ketones and examination of their inhibitory effects on human spleen fibrinolytic proteinase(SFP) and human leukocyte elastase(LE).
Various substrate-derived chloromethyl ketones were synthesized by a conventional method for the purpose of obtaining specific and potent irreversible inhibitors for human spleen fibrinolytic proteinase (SFP) and human leukocyte elastase (LE) in order to compare the properties of SFP with those of LE. It was found that Boc-Ala-Tyr-Leu-Val-CH2Cl among the peptide chloromethyl ketones exhibited the most effective and specific inhibition of SFP and LE. The two enzymes were inhibited by peptide chloromethyl ketones having a Val residue at the C-terminus in a similar manner, demonstrating a similarity between SFP and LE.
Method for preparing specific inhibitors of virus-specified proteases
申请人:E. I. Du Pont de Nemours and Company
公开号:US04644055A1
公开(公告)日:1987-02-17
A general method for preparing specific inhibitors of virus-specified proteases is disclosed. The inhibitors comprise a halomethyl ketone or methyl ketone moiety covalently linked to a peptide sequence of three, four or five amino acids or amino acid residues, which peptide sequence corresponds to an amino acid sequence found adjacent to and upstream of a cleavage site recognized by a virus-specified protease.
Inhibition of viral protease activity by peptide halomethyl ketones
申请人:E. I. Du Pont de Nemours and Company
公开号:US04636492A1
公开(公告)日:1987-01-13
Selected tripeptide and tetrapeptide halomethyl ketones are employed in processes for treating viral infection in mammals. These compounds inhibit picornavirus protease activity.
选定的三肽和四肽卤代甲基酮可用于治疗哺乳动物病毒感染的过程中。这些化合物抑制小肠病毒蛋白酶活性。
Synthesis and biological evaluation of modified pentapeptides as potent proteinase K inhibitors
作者:Anilkumar R. Kore、Muthian Shanmugasundaram、Irudaya Charles、Quoc Hoang
DOI:10.1016/j.bmcl.2010.03.072
日期:2010.5
This communication reports the first demonstration of synthesis and biological validation of modified pentapeptides, such as methoxysuccinyl-Ala-Ala-Ala-Pro-Leu-chloromethyl ketone 6b as a potent proteinase K inhibitor. The efficacy of MeOSuc-AAAPL-CH(2)Cl 6b analog in inhibiting the proteolytic activity of proteinase K was compared with the known MeOSuc-AAPV-CH(2)Cl analog. The examination of inhibitory activity using RT-PCR assay in the presence of proteinase K revealed that the MeOSuc-AAAPL-CH(2)Cl 6b inhibitor at a concentration of 0.05 mM allows a signal to be obtained for an exogenous target ('Xeno RNA') at 30 cycles (i.e., Ct = 30), whereas the control MeOSuc-AAPV-CH(2)Cl requires a fivefold higher concentration (0.25 mM) to produce the same Ct. A plausible explanation for the higher efficiency of MeO-Suc-AAAPL-CH(2)Cl 6b over control is proposed based on the molecular modeling studies. (C) 2010 Elsevier Ltd. All rights reserved.
TSUDA, YUKO;OKADA, YOSHIO;NAGAMATSU, YOKO;OKAMOTO, UTAKO, CHEM. AND PHARM. BULL., 35,(1987) N 9, 3576-3584