1887

Abstract

Previously, it was shown that pyrrolidine dithiocarbamate (PDTC) inhibits proteolytic polyprotein processing and replication of human rhinovirus by transporting metal ions into cells. Here, it is shown that PDTC also inhibits replication of two other picornaviruses: coxsackievirus B3 (CVB3), a closely related virus that belongs to the genus , and mengovirus, an encephalomyocarditis virus strain that belongs to the genus , and that this inhibition is due to the dithiocarbamate moiety of the compound. Making use of subgenomic replicons, evidence is provided that PDTC inhibits replication of these two viruses by disturbing viral RNA synthesis. Furthermore, it is shown that PDTC transports zinc ions into cells and that these zinc ions play an important role in the antiviral activity mediated by PDTC. Finally, it is shown that PDTC interferes with proteolytic processing of the polyproteins of both CVB3 and mengovirus, but that the underlying mechanism between these two viruses differs. In CVB3-infected cells, PDTC interferes strongly with the proteolytic activity of 3CD, as shown by the impaired production of the mature capsid proteins as well as the autocleavage of 3CD into 3C and 3D. In mengovirus-infected cells, however, PDTC had no effect on the proteolytic production of capsid proteins or the autocleavage of 3CD. Instead, PDTC caused the accumulation of a high-molecular-mass precursor protein, due to an impairment in the primary ‘break’ that normally occurs at the 2A–2B junction. Thus, PDTC disturbs polyprotein processing and replication of two groups of picornaviruses, enteroviruses and cardioviruses, but the underlying mechanism is different.

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2007-04-01
2019-11-18
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