Cyclopeptidic inactivators for chymotrypsin-like proteinases
摘要:
Cyclopeptides containing a functionalized meta-aminobenzoic acid residue (m-aB[CH2X] with X = OC6H5, OAc, Br, Cl) linked to a tetraglycyl-phenylalanyl sequence, have been synthesized in solution. A phenyl ether group has been used during chain elongation and cyclisation, and then cleaved by treatment with HBr/HOAc to give the corresponding bromide, from which the acetate and the chloride have been obtained. The functionalized aminobenzoic acid residues possess a latent quinonimmonium methide electrophilic function, and these cyclopeptides are potential ''suicide'' substrates of chymotrypsin-like proteases. The cyclopeptides with X = Br or Cl irreversibly inhibit alpha-chymotrypsin (k(inact)/K(I) = 180 M-1min-1 for X = Cl). The compounds with poorer leaving groups X = OAc or OC6H5 are devoid of inactivating effect and only behave as substrates of this enzyme (k(cat)/K(M) = 31 800 M-1min-1 and 120 000 M-1min-1, respectively).
Cyclopeptidic inactivators for chymotrypsin-like proteinases
摘要:
Cyclopeptides containing a functionalized meta-aminobenzoic acid residue (m-aB[CH2X] with X = OC6H5, OAc, Br, Cl) linked to a tetraglycyl-phenylalanyl sequence, have been synthesized in solution. A phenyl ether group has been used during chain elongation and cyclisation, and then cleaved by treatment with HBr/HOAc to give the corresponding bromide, from which the acetate and the chloride have been obtained. The functionalized aminobenzoic acid residues possess a latent quinonimmonium methide electrophilic function, and these cyclopeptides are potential ''suicide'' substrates of chymotrypsin-like proteases. The cyclopeptides with X = Br or Cl irreversibly inhibit alpha-chymotrypsin (k(inact)/K(I) = 180 M-1min-1 for X = Cl). The compounds with poorer leaving groups X = OAc or OC6H5 are devoid of inactivating effect and only behave as substrates of this enzyme (k(cat)/K(M) = 31 800 M-1min-1 and 120 000 M-1min-1, respectively).
Specific and Irreversible Cyclopeptide Inhibitors of Dipeptidyl Peptidase IV Activity of the T-Cell Activation Antigen CD26
作者:Coralie Nguyen、Julià Blanco、Jean-Paul Mazaleyrat、Bernard Krust、Christian Callebaut、Etienne Jacotot、Ara G. Hovanessian、Michel Wakselman
DOI:10.1021/jm970640l
日期:1998.6.1
lysine in the P2 position, which allows the closing of the cycle on its side chain. These molecules show a free N-terminus, necessary for binding to the CD26 catalytic site, and a latent quinoniminium methide electrophile, responsible for inactivation. Treatment of c[alphaZ-Lys-Pro-Aba-(6-CH2-OC6H5)-Glyn], obtained by peptide synthesis in solution, with R2S/TFA simutaneously cleaved the Z protecting group