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- W1889588047 abstract "1. The kinetics of the degradation of the kinins bradykinin and Met-Lys-bradykinin, angiotensins I and II and the tachykinin substance P by PMNL-collagenase (MMP 8), PMNL-gelatinase (MMP 9) and by the recombinant catalytic domain of MMP 8 (rcd-PMNL-c) was examined by RP-HPLC. The resulting fragments were identified by automated Edman degradation or by amino acid analysis. 2. The initial degradation rates of substance P at a substrate concentration of 25 microM were 5 min-1 for MMP 9 and 150 min-1 for MMP 8. The kinetic constants KM and kcat were determined by concentration-dependent measurements. For MMP 8/substance P the constants were KM = 78 +/- 14 microM and kcat = 412 +/- 67 min-1. For MMP 9/substance P the constants were KM = 91 +/- 15 microM and kcat = 25 +/- 4 min-1. Both enzymes cleaved substance P between Gln6 and Phe7 and between Gly9 and Leu10. 3. Under the same conditions, MMP 8 degraded angiotensin I at an initial rate of 20 h-1, resulting mainly in the vasoactive fragments angiotensin II and angiotensin(1-7). At a substrate concentration of 25 microM and an enzyme/substrate ratio of 1:100, angiotensin II was degraded very slowly (19% in 24 h) by MMP 8. Under these conditions, MMP 9 degraded angiotensin I to a lesser extent than MMP 8 (25% in 24 h) and was unable to cleave angiotensin II. 4. Under the same conditions, bradykinin and Met-Lys-bradykinin were cleaved by PMNL-collagenase at a rate of 20% in 24 h, producing BK(1-7) and BK(1-8). PMNL-gelatinase was unable to cleave the kinins under these conditions. 5. In all cases, rcd-PMNL-c produced the same fragments as wild type PMNL-collagenase, but at a significantly lower rate." @default.
- W1889588047 created "2016-06-24" @default.
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- W1889588047 date "1994-08-01" @default.
- W1889588047 modified "2023-09-23" @default.
- W1889588047 title "Degradation of kinins, angiotensins and substance P by polymorphonuclear matrix metalloproteinases MMP 8 and MMP 9." @default.
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