On-line chromatographic screening of matrix metalloproteinase inhibitors using immobilized MMP-9 enzyme reactor.
Matrix metalloproteinase 9 (MMP-9) plays an important role in cancer invasion and metastasis and has been an attractive target for therapeutic intervention of cancer metastasis. However, considering the high cost and intricacy associated with the expression, isolation and purification of the recombinant enzyme for the screening of drug candidates, alternative methods that explore the recycling of enzymes become desirable. In this study, a new immobilized enzyme reactor (IMER) containing human recombinant MMP-9 enzyme was developed and characterized for the on-line screening of MMP-9 inhibitors. The MMP-9 IMER containing active unit of the enzyme (U=0.08 micromol/min) on the disk was inserted into a HPLC system connected to a UV-vis detector for on-line chromatographic screening. The resulting conjugated enzyme was shown to be an active and stable catalyst for the hydrolysis of MMP-9 chromogenic thiopeptide substrate Ac-PLG-[2-mercapto-4-methyl-pentanoyl]-LG-OC(2)H(5). The kinetics profile of the enzyme in IMER and free solution were determined and compared. Selected reversible MMP inhibitors, N-isobutyl-N-(4-methoxyphenylsulfonyl)-glycyl hydroxamic acid (NNGH), doxycycline and minocycline were further characterized using the MMP-9 IMER and free enzyme solution assays. Our system demonstrated applicability as a rapid and cost-effective screening tool for inhibitors of the MMP-9 enzyme.
Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore.
Xiang
X
Ma
Eric Chun Yong
EC
Chan
D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000378:metabolism; D004800:Enzymes, Immobilized / Q000378:metabolism*; D057166:High-Throughput Screening Assays / Q000379:methods*; D006801:Humans; D016014:Linear Models; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D011994:Recombinant Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism
D004791:Enzyme Inhibitors; D004800:Enzymes, Immobilized; D061965:Matrix Metalloproteinase Inhibitors; D011994:Recombinant Proteins; D020780:Matrix Metalloproteinase 9