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Updated: Jun 4, 2025

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Published on: September 1, 2019
CRTC3 restricts SARS-CoV-2 replication and is antagonized by CREB
Li Yang1, Xiao-Tao Zeng2, Rong-Hua Luo3
1Department of Pulmonary and Critical Care Medicine, Respiratory Infection and Intervention Laboratory of Frontiers Science Center for Disease-related Molecular Network, and State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China.
Host proteins CRTC1, CRTC2, and CRTC3 inhibit human coronavirus (HCoV) replication by targeting the viral RNA-dependent RNA polymerase (RdRp). These CRTCs offer potential for developing new anti-HCoV therapies.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Viral RNA-dependent RNA polymerase (RdRp) is crucial for human coronavirus (HCoV) replication and transcription.
- The interaction between SARS-CoV-2 RdRp subunit NSP12 and host protein CRTC3 was previously identified.
- The role of CRTC3 in HCoV pathogenesis remains largely unknown.
Purpose of the Study:
- To investigate the role of CRTC3 in HCoV replication and pathogenesis.
- To explore the suppressive effects of CRTC family members (CRTC1, CRTC2, CRTC3) on HCoV RdRp activity.
- To understand the interplay between CRTCs, CREB, and HCoV replication.
Main Methods:
- Investigated the interaction between CRTC3 and SARS-CoV-2 NSP12.
- Assessed the impact of CRTC3 on RdRp activity and viral replication.
- Evaluated the effects of CRTC1 and CRTC2 on RdRp activity of SARS-CoV-2 and MERS-CoV.
- Examined the antagonization of CREB by CRTCs.
Main Results:
- CRTC3 attenuates RdRp activity and SARS-CoV-2 genome replication, reducing progeny virus production.
- CRTC3's interaction with NSP12 mediates its inhibitory effect on RdRp activity.
- CRTC1 and CRTC2 also suppress RdRp activity of SARS-CoV-2 and MERS-CoV, alongside CREB antagonism.
Conclusions:
- CRTC proteins restrict the replication of human coronaviruses.
- CREB antagonizes the suppressive effects of CRTCs on HCoV replication.
- CRTCs represent potential therapeutic targets for anti-HCoV interventions.
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