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Coronavirus genomic nsp14-ExoN, structure, role, mechanism, and potential application as a drug target #MMPMID33837972
Tahir M
J Med Virol 2021[Jul]; 93 (7): 4258-4264 PMID33837972show ga
The recent coronavirus disease 2019 (COVID-19), causing a global pandemic with devastating effects on healthcare and social-economic systems, has no special antiviral therapies available for human coronaviruses (CoVs). The severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2) possesses a nonstructural protein (nsp14), with amino-terminal domain coding for proofreading exoribonuclease (ExoN) that is required for high-fidelity replication. The ability of CoVs during genome replication and transcription to proofread and exclude mismatched nucleotides has long hindered the development of anti-CoV drugs. The resistance of SARS-CoV-2 to antivirals, especially nucleoside analogs (NAs), shows the need to identify new CoV inhibition targets. Therefore, this review highlights the importance of nsp14-ExoN as a target for inhibition. Also, nucleoside analogs could be used in combination with existing anti-CoV therapeutics to target the proofreading mechanism.