Cyclophilin A complexed with a fragment of HIV-1 gag protein: insights into HIV-1 infectious activity.

Cyclophilin A complexed with a fragment of HIV-1 gag protein: insights into HIV-1 infectious activity.
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亲环蛋白 A 与 HIV-1 gag 蛋白片段复合:深入了解 HIV-1 感染活性。

DOI:
10.1016/s0969-2126(97)00172-x
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发表时间:
1997
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Ke,H
Ke,H
中科院分区:
--
文献类型:
--
作者:
Zhao,Y;Chen,Y;Schutkowski,M;Fischer,G;Ke,H

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背景:亲环素A(Cyclophilin A,CyPA)是免疫抑制剂环孢菌素A(cyclosporin A,CsA)的受体,催化肽基-脯氨酰键的顺式转异构化,是人类免疫缺陷病毒1型(human immunodeficiency virus type 1,HIV-1)感染活性所必需的。CyPA与HIV-1 gag蛋白片段复合的晶体结构应提供深入了解CyPA-gag相互作用的性质,并可能表明CyPA在HIV-1感染activity.Results中的作用:确定CyPA与HIV-1 gag衣壳蛋白的25个氨基酸肽(25-mer)复合的晶体结构,并在1.8 μ m分辨率下将其精修至R因子为0.195。gag片段的序列Ala 88-Gly 89-Pro 90-Ile 91是与CyPA活性位点结合的主要部分。25-mer的两个残基(Pro 90-Ile 91)以与CyPA底物琥珀酰-Ala-Ala-Pro-Phe-对硝基苯胺(AAPF)的两个残基(Pro-Phe)类似的方式结合CyPA。然而,25-mer(Ala 88-Gly 89)的N-末端表现出与AAPF不同的氢键模式和分子构象。25-mer的Gly 89和Pro 90之间的肽基-脯氨酰键具有反式构象,与在其他已知的CyPA-肽复合物中观察到的构象相反。结论:gag 25-mer片段中Gly 89的骨架构象不佳,提示HIV-1gag蛋白与CyPA的结合需要一个特殊的序列Gly-Pro。因此,在HIV-1感染性中,CyPA可能作为伴侣蛋白发挥作用,而不是作为酸式转异构酶发挥作用。然而,25-mer和底物AAPF的C末端之间的相似性的观察意味着不能完全排除CyPA的半胱氨酸-转氨酶活性的参与。
Background:Cyclophilin A (CyPA), a receptor of the immunosuppressive drug cyclosporin A, catalyzes thecis-transisomerization of peptidyl–prolyl bonds and is required for the infectious activity of human immunodeficiency virus type 1 (HIV-1). The crystal structure of CyPA complexed with a fragment of the HIV-1 gag protein should provide insights into the nature of CyPA–gag interactions and may suggest a role for CyPA in HIV-1 infectious activity.Results:The crystal structure of CyPA complexed with a 25 amino acid peptide of HIV-1 gag capsid protein (25-mer) was determined and refined to an R factor of 0.195 at 1.8 Å resolution. The sequence Ala88-Gly89-Pro90-Ile91 of the gag fragment is the major portion to bind to the active site of CyPA. Two residues of the 25-mer (Pro90-Ile91) bind to CyPA in a similar manner to two residues (Pro-Phe) of the CyPA substrate, succinyl-Ala-Ala-Pro-Phe-p-nitroanilide (AAPF). However, the N-terminus of the 25-mer (Ala88-Gly89) exhibits a different hydrogen-bonding pattern and molecular conformation than AAPF. The peptidyl–prolyl bond between Gly89 and Pro90 of the 25-mer has atransconformation, in contrast to thecisconformation observed in other known CyPA–peptide complexes. The residue preceding proline, Gly89, has an unfavorable backbone conformation usually only adopted by glycine.Conclusions:The unfavorable backbone conformation of Gly89 of the gag 25-mer fragment suggests that binding between HIV-1 gag protein and CyPA requires a special sequence, Gly-Pro. Thus, in HIV-1 infectivity, CyPA is likely to function as a chaperone, rather than as acis-transisomerase. However, the observation of similarities between the C termini of the 25-mer and the substrate AAPF means that the involvement of thecis-transisomerase activity of CyPA cannot be completely ruled out.
IV型原胶原的热稳定性和折叠以及肽基脯氨酰顺反异构酶对三螺旋折叠的影响。
DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Davis,JM;Boswell,BA;Bächinger,HP
通讯作者: Bächinger,HP
DOI: 10.1021/bi00464a023
发表时间: 1990-03-27
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
KIEFHABER, T;QUAAS, R;SCHMID, FX
通讯作者: SCHMID, FX
通过与 HIV-1 Gag 多蛋白衍生寡肽的相互作用揭示了亲环蛋白的扩展结合位点
DOI: 10.1016/0014-5793(96)00972-6
发表时间: 1996
期刊: FEBS Letters
影响因子: 3.5
作者:
M. Schutkowski;M. Drewello;Steffen Wöllner;M. Jakob;U. Reimer;G. Scherer;A. Schierhorn;G. Fischer
通讯作者: G. Fischer
DOI: 10.1073/pnas.88.21.9483
发表时间: 1991-11-01
影响因子: 11.1
作者:
KE, HM;ZYDOWSKY, LD;WALSH, CT
通讯作者: WALSH, CT
亲环蛋白结合的脯氨酸异构酶底物的溶液构象。
DOI: 10.1021/bi00172a028
发表时间: 1994
期刊: Biochemistry
影响因子: 2.9
作者:
Kakalis,LT;Armitage,IM
通讯作者: Armitage,IM