Expression, purification, and in vitro activity of an arterivirus main proteinase.
Expression, purification, and in vitro activity of an arterivirus main proteinase.
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DOI:
10.1016/j.virusres.2006.01.025
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发表时间:
2006-09
期刊:
影响因子:
5
通讯作者:
Snijder EJ
中科院分区:
文献类型:
--
作者:
van Aken D;Benckhuijsen WE;Drijfhout JW;Wassenaar AL;Gorbalenya AE;Snijder EJ
To allow the biochemical and structural characterization of the chymotrypsin-like “main proteinase” (non-structural protein 4; nsp4) of the arterivirus prototype Equine Arteritis Virus (EAV), we developed protocols for the large-scale production of recombinant nsp4 in Escherichia coli. The nsp4 proteinase was expressed either fused to maltose binding protein or carrying a C-terminal hexahistidine tag. Following purification, the nsp4 moiety of MBP-nsp4 was successfully used for structural studies [Barrette-Ng, I.H., Ng, K.K.S., Mark, B.L., van Aken, D., Cherney, M.M., Garen, C, Kolodenko, Y., Gorbalenya, A.E., Snijder, E.J., James, M.N.G, 2002. Structure of arterivirus nsp4—the smallest chymotrypsin-like proteinase with an alpha/beta C-terminal extension and alternate conformations of the oxyanion hole. J. Biol. Chem. 277, 39960–39966]. Furthermore, both forms of the EAV proteinase were shown to be proteolytically active in two different trans-cleavage assays. Recombinant nsp4 cleaved the cognate nsp6/7- and nsp7/8 site in in vitro synthesized substrates. In a synthetic peptide-based activity assay, the potential of the recombinant proteinase to cleave peptides mimicking the P9–P7′ residues of six nsp4 cleavage sites was investigated. The peptide representing the EAV nsp7/8 junction was used to optimize the reaction conditions (pH 7.5, 25 mM NaCl, 30% glycerol at 30 °C), which resulted in a maximum turnover of 15% of this substrate in 4 h, using a substrate to enzyme molar ratio of 24:1. The assays described in this study can be used for a more extensive biochemical characterization of the EAV main proteinase, including studies aiming to identify inhibitors of proteolytic activity.
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影响因子:
3.5
作者:
Gorbalenya AE;Koonin EV;Lai MM
通讯作者:
Lai MM
影响因子:
11.4
作者:
Anand, Kanchan;Palm, Gottfried J;Mesters, Jeroen R;Siddell, Stuart G;Ziebuhr, John;Hilgenfeld, Rolf
通讯作者:
Hilgenfeld, Rolf
DOI:
10.1074/jbc.m311744200
发表时间:
2004-06-04
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Shi J;Wei Z;Song J
通讯作者:
Song J
影响因子:
1.6
作者:
Franken, KLMC;Hiemstra, HS;Drijfhout, JW
通讯作者:
Drijfhout, JW
影响因子:
5.4
作者:
SNIJDER, EJ;WASSENAAR, ALM;SPAAN, WJM
通讯作者:
SPAAN, WJM