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Divalent metal ion complexes of S100B in the absence and presence of pentamidine.

机译:在存在和存在喷他idine的情况下S100B的二价金属离子络合物。

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As part of an effort to inhibit S100B, structures of pentamidine (Pnt) bound to Ca(2+)-loaded and Zn(2+),Ca(2+)-loaded S100B were determined by X-ray crystallography at 2.15 A (R(free)=0.266) and 1.85 A (R(free)=0.243) resolution, respectively. These data were compared to X-ray structures solved in the absence of Pnt, including Ca(2+)-loaded S100B and Zn(2+),Ca(2+)-loaded S100B determined here (1.88 A; R(free)=0.267). In the presence and absence of Zn(2+), electron density corresponding to two Pnt molecules per S100B subunit was mapped for both drug-bound structures. One Pnt binding site (site 1) was adjacent to a p53 peptide binding site on S100B (+/-Zn(2+)), and the second Pnt molecule was mapped to the dimer interface (site 2; +/-Zn(2+)) and in a pocket near residues that define the Zn(2+) binding site on S100B. In addition, a conformational change in S100B was observed upon the addition of Zn(2+) to Ca(2+)-S100B, which changed the conformation and orientation of Pnt bound to sites 1 and 2 of Pnt-Zn(2+),Ca(2+)-S100B when compared to Pnt-Ca(2+)-S100B. That Pnt can adapt to this Zn(2+)-dependent conformational change was unexpected and provides a new mode for S100B inhibition by this drug. These data will be useful for developing novel inhibitors of both Ca(2+)- and Ca(2+),Zn(2+)-bound S100B.
机译:作为抑制S100B的努力的一部分,通过X射线晶体学在2.15 A下确定与Ca(2+)负载和Zn(2 +),Ca(2+)负载的S100B结合的喷他idine(Pnt)的结构( R(free)= 0.266)和1.85 A(R(free)= 0.243)分辨率。将这些数据与在没有Pnt的情况下解决的X射线结构进行比较,包括此处确定的Ca(2+)装载的S100B和Zn(2 +),Ca(2+)装载的S100B(1.88 A; R(免费)) = 0.267)。在存在和不存在Zn(2+)的情况下,对应于每个S100B亚基两个Pnt分子的电子密度被映射为两个药物结合结构。一个Pnt结合位点(位点1)与S100B上的p53肽结合位点(+/- Zn(2+))相邻,第二个Pnt分子被定位到二聚体界面(位点2; +/- Zn(2 +))并在残基附近的口袋中定义S100B上的Zn(2+)结合位点。此外,在向Ca(2 +)-S100B添加Zn(2+)后,观察到S100B的构象变化,这改变了与Pnt-Zn(2+)的位点1和2结合的Pnt的构象和方向。与Pnt-Ca(2 +)-S100B相比,Ca(2 +)-S100B。 Pnt可以适应这种Zn(2+)依赖的构象变化是出乎意料的,并为这种药物提供了S100B抑制的新模式。这些数据将对开发新型的Ca(2 +)-和Ca(2 +),Zn(2+)结合的S100B抑制剂有用。

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