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Crystal structure of human immunodeficiency virus (HIV) type 2 protease in complex with a reduced amide inhibitor and comparison with HIV-1 protease structures.

机译:人免疫缺陷病毒(HIV)2型蛋白酶的晶体结构与酰胺抑制剂含量降低的复合物,并与HIV-1蛋白酶结构进行比较。

摘要

The crystal structure of HIV-2 protease in complex with a reduced amide inhibitor [BI-LA-398; Phe-Val-Phe-psi (CH2NH)-Leu-Glu-Ile-amide] has been determined at 2.2-A resolution and refined to a crystallographic R factor of 17.6%. The rms deviation from ideality in bond lengths is 0.018 A and in bond angles is 2.8 degrees. The largest structural differences between HIV-1 and HIV-2 proteases are located at residues 15-20, 34-40, and 65-73, away from the flap region and the substrate binding sites. The rms distance between equivalent C alpha atoms of HIV-1 and HIV-2 protease structures excluding these residues is 0.5 A. The shapes of the S1 and S2 pockets in the presence of this inhibitor are essentially unperturbed by the amino acid differences between HIV-1 and HIV-2 proteases. The interaction of the inhibitor with HIV-2 protease is similar to that observed in HIV-1 protease structures. The unprotected N terminus of the inhibitor interacts with the side chains of Asp-29 and Asp-30. The glutamate side chain of the inhibitor forms hydrogen bonds with the main-chain amido groups of residues 129 and 130.
机译:HIV-2蛋白酶的晶体结构与还原的酰胺抑制剂[BI-LA-398; [Phe-Val-Phe-psi(CH2NH)-Leu-Glu-Ile-amide]已在2.2-A分辨率下测定,并精炼至结晶R因子17.6%。粘结长度与理想值的均方根偏差为0.018 A,粘结角为2.8度。 HIV-1和HIV-2蛋白酶之间最大的结构差异位于残基15-20、34-40和65-73,远离襟翼区域和底物结合位点。 HIV-1和HIV-2蛋白酶结构(不包括这些残基)的等效Cα原子之间的均方根距离为0.5A。在存在这种抑制剂的情况下,S1和S2口袋的形状基本上不受HIV-之间氨基酸差异的干扰1和HIV-2蛋白酶。抑制剂与HIV-2蛋白酶的相互作用类似于在HIV-1蛋白酶结构中观察到的相互作用。抑制剂的未保护的N末端与Asp-29和Asp-30的侧链相互作用。抑制剂的谷氨酸侧链与残基129和130的主链酰胺基形成氢键。

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