Amino Acids and Peptides. LII. Design and Synthesis of Opioid Mimetics Containing a Pyrazinone Ring and Examination of Their Opioid Receptor Binding Activity.
Exploring the Sn Binding Pockets in Gingipains by Newly Developed Inhibitors: Structure-Based Design, Chemistry, and Activity
摘要:
Arg-gingipains (Rgps) and Lys-gingipain (Kgp) are cysteine proteinases secreted by Porphyromonas gingivalis, the major pathogen implicated in periodontal disease. Gingipains are essential to the bacterium for its virulence and survival, and development of inhibitors targeting these proteins provides an approach to treat periodontal diseases. Here, we present the first example of structure-based design of gingipains inhibitors, with the use of the crystal structure of RgpB and the homology model of Kgp. Chloromethyl ketones were selected as suitable compounds to explore the specificity of the Sn binding region of both enzymes. Three series of inhibitors bearing Arg or Lys at P1 and different substituents at P2 and P3 were designed, synthesized, and tested. High potency (k(obs)/[I] similar to 10(7) M-1 s(-1)) was achieved for small ligands, such as the dipeptide analogues. The detailed analysis of Sn binding pockets revealed the molecular basis of inhibitory affinity and provided insight into the structure-activity relationship.
With the aim of obtaining selective synthetic inhibitors of plasmin and plasma kallikrein, D-Ile-Phe-Lys-CH2Cl, Ile-Phe-Lys-CH2Cl, D-Ile-Phe-Arg-CH2Cl and Ile-Phe-Arg-CH2Cl were synthesized and their inhibitory activity against plasmin, plasma kallikrein and other trypsin-like serine proteinases was examined. Among them, D-Ile-Phe-Arg-CH2Cl exhibited a highly selective inhibitory activity against plasma kallikrein, yet D-Ile-Phe-Lys-CH2Cl exhibited nearly the same order of inhibitory activity against plasmin as well as plasma kallikren.
Amino acids and peptides. LVI. Synthesis of pyrazinone ring-containing opioid mimetics and examination of their opioid receptor binding activity
作者:Yoshio Okada、Atsuko Fukumizu、Motohiro Takahashi、Junpei Yamazaki、Toshio Yokoi、Yuko Tsuda、Sharon D Bryant、Lawrence H Lazarus
DOI:10.1016/s0040-4020(99)00908-4
日期:1999.12
6-bis(4-aminobutyl)-5-methyl-2(1H)-pyrazinone (15). Using above pyrazinone derivatives, three opioid mimetics were prepared (III-V). Derivatives containing 3 and 6 demonstrated weak μ and δ-opioid receptor affinities ranging from 1.6 mM to 4.1 mM while the opioid mimetic containing derivative 15 displayed higher μ-opioid receptorbinding affinity (Kiμ = 61 nM) and selectivity ().
Amino Acids and Peptides. LII. Design and Synthesis of Opioid Mimetics Containing a Pyrazinone Ring and Examination of Their Opioid Receptor Binding Activity.
作者:Yoshio OKADA、Masaki TSUKATANI、Hiroaki TAGUCHI、Toshio YOKOI、Sharon D. BRYANT、Lawrence H. LAZARUS
DOI:10.1248/cpb.46.1374
日期:——
An amino group was introduced to the 3 or 6 position of a pyrazinone ring by cyclization of dipeptidyl chloromethyl ketones. Boc-Tyr-OH was coupled with the amino funciton, followed by removal of the Boc group to give pyrazinone ring-containing tyrosine derivatives. Of the various tyrosine derivatives prepared, 5-methyl-6-β-phenethyl-3-tyrosylaminobutyl-2(1H)-pyrazinone exhibited strong binding to the μ-opioid receptor with a Ki value of 55.8 nM and to the δ-opioid receptor with a Ki value of 2165 nM and with a Kiμ/Kiδ value of 0.026.
Arg-gingipains (Rgps) and Lys-gingipain (Kgp) are cysteine proteinases secreted by Porphyromonas gingivalis, the major pathogen implicated in periodontal disease. Gingipains are essential to the bacterium for its virulence and survival, and development of inhibitors targeting these proteins provides an approach to treat periodontal diseases. Here, we present the first example of structure-based design of gingipains inhibitors, with the use of the crystal structure of RgpB and the homology model of Kgp. Chloromethyl ketones were selected as suitable compounds to explore the specificity of the Sn binding region of both enzymes. Three series of inhibitors bearing Arg or Lys at P1 and different substituents at P2 and P3 were designed, synthesized, and tested. High potency (k(obs)/[I] similar to 10(7) M-1 s(-1)) was achieved for small ligands, such as the dipeptide analogues. The detailed analysis of Sn binding pockets revealed the molecular basis of inhibitory affinity and provided insight into the structure-activity relationship.