Catalytic site conformations in human PNP by 19F-NMR and crystallography.

Catalytic site conformations in human PNP by 19F-NMR and crystallography.
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通过 19F-NMR 和晶体学测定人 PNP 中的催化位点构象。

DOI:
10.1016/j.chembiol.2013.01.009
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发表时间:
2013
影响因子:
--
通讯作者:
Schramm,VernL
Schramm,VernL
中科院分区:
生物1区
文献类型:
--
作者:
Suarez,Javier;Haapalainen,AnttiM;Cahill,SeanM;Ho,Meng-Chiao;Yan,Funing;Almo,StevenC;Schramm,VernL

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嘌呤核苷磷酸化酶(PNP)是白血病、痛风和自身免疫性疾病的靶点。催化位点环的动态运动与催化有关,但缺乏实验证据。我们用6-氟-色氨酸(6 FW)取代催化位点组His 257或His 64作为位点特异性NMR探针。在6 FW-His 257-螺旋和His 64 - 6 FW-环区域的构象调整,其特征在于在PNP磷酸结合酶和催化位点配体,包括过渡态类似物的复合物。与这些复合物的化学位移和线形变化揭示了在这些地区的磷酸结合酶和改变或单一的构象在其他复合物的几个构象状态的动态共存。这些构象也通过X射线晶体学表征。特异性19 F-Trp标记和X射线晶体学提供了人PNP的自由、催化和抑制复合物的构象状态的多维表征。
Purine nucleoside phosphorylase (PNP) is a target for leukemia, gout, and autoimmune disorders. Dynamic motion of catalytic site loops has been implicated in catalysis, but experimental evidence was lacking. We replaced catalytic site groups His257 or His64 with 6-fluoro-tryptophan (6FW) as site-specific NMR probes. Conformational adjustments in the 6FW-His257-helical and His64-6FW-loop regions were characterized in PNP phosphate-bound enzyme and in complexes with catalytic site ligands, including transition state analogs. Chemical shift and line-shape changes associated with these complexes revealed dynamic coexistence of several conformational states in these regions in phosphate-bound enzyme and altered or single conformations in other complexes. These conformations were also characterized by X-ray crystallography. Specific19F-Trp labels and X-ray crystallography provide multidimensional characterization of conformational states for free, catalytic, and inhibited complexes of human PNP.
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