Design of sensitive fluorogenic substrates for human cathepsin D

被引:46
作者
Gulnik, SV [1 ]
Suvorov, LI [1 ]
Majer, P [1 ]
Collins, J [1 ]
Kane, BP [1 ]
Johnson, DG [1 ]
Erickson, JW [1 ]
机构
[1] NCI, FREDERICK CANC RES & DEV CTR, SAIC FREDERICK, AIDS VACCINE PROGRAM, FREDERICK, MD 21702 USA
关键词
cathepsin D; fluorogenic substrate; structure-based modeling;
D O I
10.1016/S0014-5793(97)00886-7
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Cathepsin D is a lysosomal aspartic proteinase that has been implicated in several pathological processes such as breast cancer and Alzheimer's disease, We designed and synthesized a number of quenched fluorogenic substrates with P2 variations in the series AcEE(EDANS)KPIXFFRLGK(DABCYL)E-NH2, where X=cysteine, methylcysteine, ethylcysteine, tert-butylcysteine, carboxymethylcysteine, methionine, valine or isoleucine, Most of the fluorogenic substrates exhibited greater k(cat)/K-m ratios than the best cathepsin D substrates described so far, Differences in kinetic constants, which were rationalized using structure-based modeling, might make certain substrates useful for particular applications, such as active site titrations or initial velocity determination using a fluorescent plate reader, (C) 1997 Federation of European Biochemical Societies.
引用
收藏
页码:379 / 384
页数:6
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