Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/71190
標題: Quantitative structure-activity relationships for the pre-steady state of Pseudomonas species lipase inhibitions by p-nirophenyl-N-substituted carbamates
作者: Lin, G.L.
Liao, W.C.
Ku, Z.H.
關鍵字: carbamate inhibitors
QSAR
Pseudomonas species lipase
pre-steady state
kinetics
structure-reactivity relationships
pancreatic cholesterol esterase
cross-interaction correlations
acetylcholinesterase inhibition
molecular recognition
crystal-structure
binding-site
interfacial
activation
fluoromethyl ketones
subtilisin carlsberg
期刊/報告no:: Protein Journal, Volume 24, Issue 4, Page(s) 201-207.
摘要: The pre-steady states of Pseudomonas species lipase inhibitions by p-nitrophenyl-N-substituted carbamates (1-6) are composed of two steps: (1) formation of the non-covalent enzyme-inhibitor complex (E:I) from the inhibitor and the enzyme and (2) formation of the tetrahedral enzyme-inhibitor adduct (E-I) from the E:I complex. From a stopped-flow apparatus, the dissociation constant for the E:I complex, K-S, and the rate constant for formation of the tetrahedral E-I adduct from the E:I complex, k(2) are obtained from the non-linear least-squares of curve fittings of first-order rate constant (k(obs)) versus inhibition concentration ([I]) plot against k(obs)=k(2)+k(2)[I]/(K-S+[I]). Values of pK(S), and log k(2) are linearly correlated with the rho(*) values with the rho(*) values of -2.0 and 0.36, respectively. Therefore, the E:I complexes are more positive charges than the inhibitors due to the rho(*) value of -2.0. The tetrahedral E-I adducts on the other hand are more negative charges than the E:I complexes due to the rho(*) value of 0.36. Formation of the E:I complex from the inhibitor and the enzyme are further divided into two steps: (1) the pre-equilibrium protonation of the inhibitor and (2) formation of the E:I complex from the protonated inhibitor and the enzyme.
URI: http://hdl.handle.net/11455/71190
ISSN: 1572-3887
文章連結: http://dx.doi.org/10.1007/s10930-005-6712-5
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