Structure of apo- and monometalated forms of NDM-1--a highly potent carbapenem-hydrolyzing metallo-β-lactamase.

Structure of apo- and monometalated forms of NDM-1--a highly potent carbapenem-hydrolyzing metallo-β-lactamase.
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NDM-1的Apo-和单位净形式的结构 - 高度有效的碳青霉烯酸化金属元素-β-内酰胺酶。

DOI:
10.1371/journal.pone.0024621
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Joachimiak A
Joachimiak A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kim Y;Tesar C;Mire J;Jedrzejczak R;Binkowski A;Babnigg G;Sacchettini J;Joachimiak A

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新德里金属β-内酰胺酶(NDM-1)基因使多种病原微生物对所有已知的β-内酰胺抗生素产生耐药性。NDM-1的迅速出现与移动的质粒有关,这些质粒在不同菌株之间移动,导致世界范围的传播。生物化学研究表明,NDM-1能够有效水解广泛的β-内酰胺类药物,包括许多被认为是“最后手段”的碳青霉烯类抗生素。本文所呈现的NDM-1的无金属载脂蛋白和单锌形式的晶体结构揭示了B1类金属-β-内酰胺酶的扩大和灵活的活性位点。该位点能够通过在柔性环上具有许多催化残基来容纳许多β-内酰胺底物,这解释了观察到的该锌依赖性β-内酰胺酶的广谱活性。实际上,五个环在活性位点中贡献“小桶”残基,包括参与金属结合的侧链。特别是环1,显示构象的灵活性,显然有关的接受和定位的基板切割的锌活化水分子。
The New Delhi Metallo-β-lactamase (NDM-1) gene makes multiple pathogenic microorganisms resistant to all known β-lactam antibiotics. The rapid emergence of NDM-1 has been linked to mobile plasmids that move between different strains resulting in world-wide dissemination. Biochemical studies revealed that NDM-1 is capable of efficiently hydrolyzing a wide range of β-lactams, including many carbapenems considered as “last resort” antibiotics. The crystal structures of metal-free apo- and monozinc forms of NDM-1 presented here revealed an enlarged and flexible active site of class B1 metallo-β-lactamase. This site is capable of accommodating many β-lactam substrates by having many of the catalytic residues on flexible loops, which explains the observed extended spectrum activity of this zinc dependent β-lactamase. Indeed, five loops contribute “keg” residues in the active site including side chains involved in metal binding. Loop 1 in particular, shows conformational flexibility, apparently related to the acceptance and positioning of substrates for cleavage by a zinc-activated water molecule.
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