Seneca valley virus 3Cpro substrate optimization yields efficient substrates for use in peptide-prodrug therapy

Linde A. Miles, W. Nathaniel Brennen, Charles M. Rudin, John T. Poirier

Research output: Contribution to journalArticlepeer-review


The oncolytic picornavirus Seneca Valley Virus (SVV-001) demonstrates anti-tumor activity in models of small cell lung cancer (SCLC), but may ultimately need to be combined with cytotoxic therapies to improve responses observed in patients. Combining SVV-001 virotherapy with a peptide prodrug activated by the viral protease 3Cpro is a novel strategy that may increase the therapeutic potential of SVV-001. Using recombinant SVV-001 3Cpro, we measured cleavage kinetics of predicted SVV-001 3Cpro substrates. An efficient substrate, L/VP4 (kcat/KM = 1932 ± 183 M-1s-1), was further optimized by a P2′ N→P substitution yielding L/VP4.1 (kcat/KM = 17446 ± 2203 M-1s-1). We also determined essential substrate amino acids by sequential N-terminal deletion and substitution of amino acids found in other picornavirus genera. A peptide corresponding to the L/VP4.1 substrate was selectively cleaved by SVV-001 3Cpro in vitro and was stable in human plasma. These data define an optimized peptide substrate for SVV-001 3Cpro, with direct implications for anti-cancer therapeutic development.

Original languageEnglish (US)
Article numbere0129103
JournalPloS one
Issue number6
StatePublished - Jun 12 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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