バクテリアの細胞壁末端に結合するバンコミシンとティエコプラニンの第一原理調査
Jung-Goo Lee1, Celeste Sagui, Christopher Roland
1Department of Physics, The North Carolina State University, Raleigh, North Carolina 27695-82802, USA.
Journal of the American Chemical Society
|July 9, 2004
まとめ
バンコマイシン耐性腸内球菌 (VRE) がグリコペプチド抗生物質に結合することは,d-Ala-d-Lacでd-Ala-d-Alaよりも弱い. この違いは,主にVRE複合体における酸素-酸素単対排斥によるものです.
科学分野:
- バイオケミストリー バイオケミストリー
- 微生物学 微生物学とは
- コンピューティング・ケミストリー
背景:
- バンコマイシン耐性腸内球菌 (VRE) の出現は,グリコペプチド抗生物質耐性メカニズムを理解することを必要としています.
- バクテリアの細胞壁末端,特にVREにおけるd-Ala-d-Lacおよび非VREにおけるd-Ala-d-Alaは,バンコミシンやティエコプラニンなどの抗生物質の主要な標的である.
研究 の 目的:
- バンコマイシンとティエコプラニンが細菌の細胞壁に結合する afinities を調査する.
- d-Ala-d-Lac (VRE) とd-Ala-d-Ala (非VRE) との抗生物質結合を制御する分子相互作用を解明する.
主な方法:
- 広範囲にわたる第一原理の計算調査が採用されました.
- 分析は,抗生物質と2つの異なる細胞壁の間の結合エネルギーと相互作用ダイナミクスに焦点を当てた.
主要な成果:
- ヴァンコミシンとテイコプラニンの結合は,d-Ala-d-Alaに,d-Ala-d-Lacに比べて,約3〜5kcal/molで著しく強かった.
- d-Ala-d-Lacに対する結合 afinityの低下は,主に,抗生物質/d-Ala-d-Lac複合体内の酸素-酸素単一のペアの排斥に起因しています.
結論:
- 計算上の発見は,ヴァンコマイシンとティエコプラニンのVREに対する有効性の低下に対する分子基盤を提供します.
- この研究の結果は,グリコペプチド抗生物質耐性に関する最近の実験観察と一致し,説明しています.
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