IMP-1 metallo-beta-lactamase: effect of chelators and assessment of metal requirement by electrospray mass spectrometry.
IMP-1 metallo-beta-lactamase: effect of chelators and assessment of metal requirement by electrospray mass spectrometry.
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IMP-1 金属-β-内酰胺酶:螯合剂的作用和通过电喷雾质谱法评估金属需求。
DOI:
10.1016/s0304-4165(02)00258-1
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发表时间:
2002
期刊:
影响因子:
--
通讯作者:
T. Viswanatha
中科院分区:
文献类型:
--
作者:
S. Siemann;D. Brewer;A. Clarke;G. Dmitrienko;G. Lajoie;T. Viswanatha
Metallo-β-lactamases have attracted considerable attention due to their role in microbial resistance to β-lactam antibiotics. IMP-1, the binuclear Zn-dependent β-lactamase produced by Pseudomonas aeruginosa and other microorganisms, is of particular interest in view of its increasing prevalence. An examination of the susceptibility of IMP-1 to inactivation by six different divalent metal ion chelators has revealed that all except Zincon cause inhibition by forming a complex with the holoenzyme. Exposure of the enzyme to dipicolinic acid (DPA), the most potent inhibitor, results in the production of the mononuclear Zn form of the protein as determined by electrospray ionization mass spectrometry (ESI-MS) under nondenaturing conditions. This mononuclear Zn species was found to be catalytically competent. Studies with the chromophoric chelator 4-(2-pyridylazo)resorcinol (PAR) show that the two zinc centers in IMP-1 differ in their accessibility, a feature that could be overcome in the presence of guanidine hydrochloride (GdnHCl, 1.5 M).
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影响因子:
2.9
作者:
Crowder, MW;Wang, ZG;Benkovic, SJ
通讯作者:
Benkovic, SJ
影响因子:
15
作者:
Díaz, N;Suárez, D;Merz, KM
通讯作者:
Merz, KM
影响因子:
2.9
作者:
Fast, W;Wang, ZG;Benkovic, SJ
通讯作者:
Benkovic, SJ
影响因子:
2.9
作者:
Wang, ZG;Fast, W;Benkovic, SJ
通讯作者:
Benkovic, SJ