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Journal of Virology, November 2005, p. 13892-13899, Vol. 79, No. 22
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.22.13892-13899.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Inhibition of Polyprotein Processing and RNA Replication of Human Rhinovirus by Pyrrolidine Dithiocarbamate Involves Metal Ions

B. M. Krenn,1 B. Holzer,1 E. Gaudernak,1 A. Triendl,1 F. J. van Kuppeveld,2 and J. Seipelt1*

Max F. Perutz Laboratories, University Departments at the Vienna Biocenter, Department of Medical Biochemistry, Medical University of Vienna, Dr. Bohr Gasse 9/3, A-1030 Vienna, Austria,1 Department of Medical Microbiology, Radboud University Nijmegen Medical Centre, Nijmegen Centre for Molecular Life Sciences, 6500 HB Nijmegen, The Netherlands2

Received 29 April 2005/ Accepted 23 August 2005

Pyrrolidine dithiocarbamate (PDTC) is an antiviral compound that was shown to inhibit the replication of human rhinoviruses (HRVs), poliovirus, and influenza virus. To elucidate the mechanism of PDTC, the effects on the individual steps of the infection cycle of HRV were investigated. PDTC did not interfere with receptor binding or internalization by receptor mediated endocytosis of HRV2 particles into HeLa cells. But we demonstrate that the processing of the viral polyprotein was prevented by PDTC treatment in HeLa cells infected with HRV2. Furthermore, PDTC inhibited the replication of the viral RNA, even when added four hours post infection. As PDTC is described as a metal ion binding agent, we investigated the effect of other metal chelators on the multiplication of HRV2. We show that EDTA, o-phenanthroline, and bathocuproine disulfonic acid do not exhibit any antiviral properties. Surprisingly, these substances, coadministered with PDTC, abolished the antiviral effect of PDTC, suggesting that metal ions play a pivotal role in the inhibition of virus multiplication. These results suggest that PDTC inhibits the activity of the viral proteases in a metal ion dependent way.

* Corresponding author. Mailing address: Department of Medical Biochemistry, Medical University Vienna, Dr. Bohrgasse 9/3, 1030 Vienna, Austria. Phone: (43) 1 4277/61610. Fax: (43) 1 4277/9616. E-mail: joachim.seipelt{at}meduniwien.ac.at.

Journal of Virology, November 2005, p. 13892-13899, Vol. 79, No. 22
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.22.13892-13899.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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