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Yeast-based assays for the high-throughput screening of inhibitors of coronavirus RNA cap guanine-N7-methyltransferase

Identifieur interne : 000974 ( PascalFrancis/Curation ); précédent : 000973; suivant : 000975

Yeast-based assays for the high-throughput screening of inhibitors of coronavirus RNA cap guanine-N7-methyltransferase

Auteurs : YING SUN [République populaire de Chine] ; ZIDAO WANG [République populaire de Chine] ; JIALI TAO [République populaire de Chine] ; YI WANG [République populaire de Chine] ; ANDONG WU [République populaire de Chine] ; ZIWEN YANG [République populaire de Chine] ; KAIMEI WANG [République populaire de Chine] ; LIQIAO SHI [République populaire de Chine] ; YU CHEN [République populaire de Chine] ; DEYIN GUO [République populaire de Chine]

Source :

RBID : Pascal:14-0104920

Descripteurs français

English descriptors

Abstract

The 5?-cap structure is a distinct feature of eukaryotic mRNAs and is important for RNA stability and protein translation by providing a molecular signature for the distinction of self or non-self mRNA. Eukaryotic viruses generally modify the 5?-end of their RNAs to mimic the cellular mRNA structure, thereby facilitating viral replication in host cells. However, the molecular organization and biochemical mechanisms of the viral capping apparatus typically differ from its cellular counterpart, which makes viral capping enzymes attractive targets for drug discovery. Our previous work showed that SARS coronavirus (SARS-CoV) non-structural protein 14 represents a structurally novel and unique guanine-N7-methyl-transferase (N7-MTase) that is able to functionally complement yeast cellular N7-MTase. In the present study, we developed a yeast-based system for identifying and screening inhibitors against coronavirus N7-MTase using both 96-well and 384-well microtiter plates. The MTase inhibitors previously identified by in vitro biochemical assays were tested, and some, such as sinefungin, effectively suppressed N7-MTase in the yeast system. However, other compounds, such as ATA and AdoHcy, did not exert an inhibitory effect within a cellular context. These results validated the yeast assay system for inhibitor screening yet also demonstrated the difference between cell-based and in vitro biochemical assays. The yeast system was applied to the screening of 3000 natural product extracts, and three were observed to more potently inhibit the activity of coronavirus than human N7-MTase.
pA  
A01 01  1    @0 0166-3542
A02 01      @0 ARSRDR
A03   1    @0 Antivir. res.
A05       @2 104
A08 01  1  ENG  @1 Yeast-based assays for the high-throughput screening of inhibitors of coronavirus RNA cap guanine-N7-methyltransferase
A11 01  1    @1 YING SUN
A11 02  1    @1 ZIDAO WANG
A11 03  1    @1 JIALI TAO
A11 04  1    @1 YI WANG
A11 05  1    @1 ANDONG WU
A11 06  1    @1 ZIWEN YANG
A11 07  1    @1 KAIMEI WANG
A11 08  1    @1 LIQIAO SHI
A11 09  1    @1 YU CHEN
A11 10  1    @1 DEYIN GUO
A14 01      @1 State Key Laboratory of Virology, College of Life Sciences, Wuhan University @2 Wuhan 430072 @3 CHN @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut. @Z 5 aut. @Z 9 aut. @Z 10 aut.
A14 02      @1 Biological Pesticide Engineering Research Center, Hubei Academy of Agricultural Science @2 Hubei 430072 @3 CHN @Z 6 aut. @Z 7 aut. @Z 8 aut.
A20       @1 156-164
A21       @1 2014
A23 01      @0 ENG
A43 01      @1 INIST @2 18839 @5 354000506165990200
A44       @0 0000 @1 © 2014 INIST-CNRS. All rights reserved.
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A47 01  1    @0 14-0104920
A60       @1 P
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A66 01      @0 GBR
C01 01    ENG  @0 The 5?-cap structure is a distinct feature of eukaryotic mRNAs and is important for RNA stability and protein translation by providing a molecular signature for the distinction of self or non-self mRNA. Eukaryotic viruses generally modify the 5?-end of their RNAs to mimic the cellular mRNA structure, thereby facilitating viral replication in host cells. However, the molecular organization and biochemical mechanisms of the viral capping apparatus typically differ from its cellular counterpart, which makes viral capping enzymes attractive targets for drug discovery. Our previous work showed that SARS coronavirus (SARS-CoV) non-structural protein 14 represents a structurally novel and unique guanine-N7-methyl-transferase (N7-MTase) that is able to functionally complement yeast cellular N7-MTase. In the present study, we developed a yeast-based system for identifying and screening inhibitors against coronavirus N7-MTase using both 96-well and 384-well microtiter plates. The MTase inhibitors previously identified by in vitro biochemical assays were tested, and some, such as sinefungin, effectively suppressed N7-MTase in the yeast system. However, other compounds, such as ATA and AdoHcy, did not exert an inhibitory effect within a cellular context. These results validated the yeast assay system for inhibitor screening yet also demonstrated the difference between cell-based and in vitro biochemical assays. The yeast system was applied to the screening of 3000 natural product extracts, and three were observed to more potently inhibit the activity of coronavirus than human N7-MTase.
C02 01  X    @0 002B02S05
C03 01  X  FRE  @0 Levure @5 01
C03 01  X  ENG  @0 Yeast @5 01
C03 01  X  SPA  @0 Levadura @5 01
C03 02  X  FRE  @0 Criblage haut débit @5 02
C03 02  X  ENG  @0 High throughput screening @5 02
C03 02  X  SPA  @0 Cribado alta productividad @5 02
C03 03  X  FRE  @0 Inhibiteur @5 03
C03 03  X  ENG  @0 Inhibitor @5 03
C03 03  X  SPA  @0 Inhibidor @5 03
C03 04  X  FRE  @0 Coronavirus @2 NW @5 04
C03 04  X  ENG  @0 Coronavirus @2 NW @5 04
C03 04  X  SPA  @0 Coronavirus @2 NW @5 04
C03 05  X  FRE  @0 Methyltransferases @2 FE @5 05
C03 05  X  ENG  @0 Methyltransferases @2 FE @5 05
C03 05  X  SPA  @0 Methyltransferases @2 FE @5 05
C03 06  X  FRE  @0 Sinéfungine @2 NK @2 FR @5 06
C03 06  X  ENG  @0 Sinefungin @2 NK @2 FR @5 06
C03 06  X  SPA  @0 Sinefungina @2 NK @2 FR @5 06
C03 07  X  FRE  @0 Antibiotique @5 23
C03 07  X  ENG  @0 Antibiotic @5 23
C03 07  X  SPA  @0 Antibiótico @5 23
C03 08  X  FRE  @0 Antiparasitaire @5 24
C03 08  X  ENG  @0 Parasiticide @5 24
C03 08  X  SPA  @0 Antiparasitario @5 24
C03 09  X  FRE  @0 Coiffe ARN @4 INC @5 86
C07 01  X  FRE  @0 Coronaviridae @2 NW
C07 01  X  ENG  @0 Coronaviridae @2 NW
C07 01  X  SPA  @0 Coronaviridae @2 NW
C07 02  X  FRE  @0 Nidovirales @2 NW
C07 02  X  ENG  @0 Nidovirales @2 NW
C07 02  X  SPA  @0 Nidovirales @2 NW
C07 03  X  FRE  @0 Virus @2 NW
C07 03  X  ENG  @0 Virus @2 NW
C07 03  X  SPA  @0 Virus @2 NW
C07 04  X  FRE  @0 Transferases @2 FE
C07 04  X  ENG  @0 Transferases @2 FE
C07 04  X  SPA  @0 Transferases @2 FE
C07 05  X  FRE  @0 Enzyme @2 FE
C07 05  X  ENG  @0 Enzyme @2 FE
C07 05  X  SPA  @0 Enzima @2 FE
N21       @1 139
N44 01      @1 OTO
N82       @1 OTO

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Pascal:14-0104920

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<div type="abstract" xml:lang="en">The 5?-cap structure is a distinct feature of eukaryotic mRNAs and is important for RNA stability and protein translation by providing a molecular signature for the distinction of self or non-self mRNA. Eukaryotic viruses generally modify the 5?-end of their RNAs to mimic the cellular mRNA structure, thereby facilitating viral replication in host cells. However, the molecular organization and biochemical mechanisms of the viral capping apparatus typically differ from its cellular counterpart, which makes viral capping enzymes attractive targets for drug discovery. Our previous work showed that SARS coronavirus (SARS-CoV) non-structural protein 14 represents a structurally novel and unique guanine-N7-methyl-transferase (N7-MTase) that is able to functionally complement yeast cellular N7-MTase. In the present study, we developed a yeast-based system for identifying and screening inhibitors against coronavirus N7-MTase using both 96-well and 384-well microtiter plates. The MTase inhibitors previously identified by in vitro biochemical assays were tested, and some, such as sinefungin, effectively suppressed N7-MTase in the yeast system. However, other compounds, such as ATA and AdoHcy, did not exert an inhibitory effect within a cellular context. These results validated the yeast assay system for inhibitor screening yet also demonstrated the difference between cell-based and in vitro biochemical assays. The yeast system was applied to the screening of 3000 natural product extracts, and three were observed to more potently inhibit the activity of coronavirus than human N7-MTase.</div>
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<s1>State Key Laboratory of Virology, College of Life Sciences, Wuhan University</s1>
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<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
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<s1>P</s1>
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<s0>The 5?-cap structure is a distinct feature of eukaryotic mRNAs and is important for RNA stability and protein translation by providing a molecular signature for the distinction of self or non-self mRNA. Eukaryotic viruses generally modify the 5?-end of their RNAs to mimic the cellular mRNA structure, thereby facilitating viral replication in host cells. However, the molecular organization and biochemical mechanisms of the viral capping apparatus typically differ from its cellular counterpart, which makes viral capping enzymes attractive targets for drug discovery. Our previous work showed that SARS coronavirus (SARS-CoV) non-structural protein 14 represents a structurally novel and unique guanine-N7-methyl-transferase (N7-MTase) that is able to functionally complement yeast cellular N7-MTase. In the present study, we developed a yeast-based system for identifying and screening inhibitors against coronavirus N7-MTase using both 96-well and 384-well microtiter plates. The MTase inhibitors previously identified by in vitro biochemical assays were tested, and some, such as sinefungin, effectively suppressed N7-MTase in the yeast system. However, other compounds, such as ATA and AdoHcy, did not exert an inhibitory effect within a cellular context. These results validated the yeast assay system for inhibitor screening yet also demonstrated the difference between cell-based and in vitro biochemical assays. The yeast system was applied to the screening of 3000 natural product extracts, and three were observed to more potently inhibit the activity of coronavirus than human N7-MTase.</s0>
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<s5>04</s5>
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<s2>NW</s2>
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<s2>NW</s2>
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<s0>Transferases</s0>
<s2>FE</s2>
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<s2>FE</s2>
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<s1>OTO</s1>
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<s1>OTO</s1>
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