Crystal structures of the main peptidase from the SARS coronavirus inhibited by a substrate-like aza-peptide epoxide.

Crystal structures of the main peptidase from the SARS coronavirus inhibited by a substrate-like aza-peptide epoxide.
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底物样的AZA肽环氧化物抑制了SARS冠状病毒的主要肽酶的晶体结构。

DOI:
10.1016/j.jmb.2005.09.004
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发表时间:
2005-11-11
影响因子:
5.6
通讯作者:
James MN
James MN
中科院分区:
生物学2区
文献类型:
--
作者:
Lee TW;Cherney MM;Huitema C;Liu J;James KE;Powers JC;Eltis LD;James MN

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引起严重急性呼吸综合征(SARS)的冠状病毒(CoV)的主要肽酶(Mpro)是抗SARS药物开发的最具吸引力的分子靶点之一。我们报告了氮杂环氧化肽对SARS-CoV Mpro的不可逆抑制(APE; kinact/Ki=1900(±400)M−1 s−1)。Mpro:APE复合物的晶体结构(空间群C2和P212121)表明,肽酶的催化Cys 145 Sγ原子与抑制剂的环氧化物C3原子之间形成了共价键,证实了这类半胱氨酸肽酶抑制剂的作用模式。APE的氮杂肽组分以底物样方式结合在Mpro的底物结合区,具有优异的结构和化学互补性。此外,在空间群C2中的未结合的Mpro的晶体结构显示,Mpro的两个原聚体的“N-指”(N-末端残基1至7)是明确的,并且两个原聚体的底物结合区域在结晶pH 6.5时处于催化活性构象,与先前确定的在空间群P21中的未结合的Mpro的晶体结构相反。
The main peptidase (Mpro) from the coronavirus (CoV) causing severe acute respiratory syndrome (SARS) is one of the most attractive molecular targets for the development of anti-SARS agents. We report the irreversible inhibition of SARS-CoV Mpro by an aza-peptide epoxide (APE; kinact/Ki=1900(±400) M−1 s−1). The crystal structures of the Mpro:APE complex in the space groups C2 and P212121 revealed the formation of a covalent bond between the catalytic Cys145 Sγ atom of the peptidase and the epoxide C3 atom of the inhibitor, substantiating the mode of action of this class of cysteine-peptidase inhibitors. The aza-peptide component of APE binds in the substrate-binding regions of Mpro in a substrate-like manner, with excellent structural and chemical complementarity. In addition, the crystal structure of unbound Mpro in the space group C2 revealed that the “N-fingers” (N-terminal residues 1 to 7) of both protomers of Mpro are well defined and the substrate-binding regions of both protomers are in the catalytically competent conformation at the crystallization pH of 6.5, contrary to the previously determined crystal structures of unbound Mpro in the space group P21.
冠状病毒主蛋白酶的结构揭示了甲over依蛋白酶折叠与额外的α-螺旋结构域的组合。
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