Programming the Rous sarcoma virus protease to cleave new substrate sequences

Todd W. Ridky, Diane Bizub-Bender, Craig E. Cameron, Irene T. Weber, Alexander Wlodawer, Terry Copeland, Anna Marie Skalka, Jonathan Leis

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The Rous sarcoma virus protease displays a high degree of specificity and catalyzes the cleavage of only a limited number of amino acid sequences. This specificity is governed by interactions between side chains of eight substrate amino acids and eight corresponding subsite pockets within the homodimeric enzyme. We have examined these complex interactions in order to learn how to introduce changes into the retroviral protease (PR) that direct it to cleave new substrates. Mutant enzymes with altered substrate specificity and wild-type or greater catalytic rates have been constructed previously by substituting single key amino acids in each of the eight enzyme subsites with those residues found in structurally related positions of human immunodeficiency virus (HIV)-1 PR. These individual amino acid substitutions have now been combined into one enzyme, resulting in a highly active mutant Rous sarcoma virus (RSV) protease that displays many characteristics associated with the HIV-1 enzyme. The hybrid protease is capable of catalyzing the cleavage of a set of HIV-1 viral polyprotein substrates that are not recognized by the wild-type RSV enzyme. Additionally, the modified PR is inhibited completely by the HIV-1 PR-specific inhibitor KNI-272 at concentrations where wild-type RSV PR is unaffected. These results indicate that the major determinants that dictate RSV and HIV-1 PR substrate specificity have been identified. Since the viral protease is a homodimer, the rational design of enzymes with altered specificity also requires a thorough understanding of the importance of enzyme symmetry in substrate selection. We demonstrate here that the enzyme homodimer acts symmetrically in substrate selection with each enzyme subunit being capable of recognizing both halves of a peptide substrate equally.

Original languageEnglish (US)
Pages (from-to)10538-10544
Number of pages7
JournalJournal of Biological Chemistry
Volume271
Issue number18
DOIs
StatePublished - May 20 1996

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Viruses
Peptide Hydrolases
Substrates
Enzymes
HIV-1
Amino Acids
Rous sarcoma virus
Substrate Specificity
Rous sarcoma virus protease
Polyproteins
Amino Acid Substitution
Protease Inhibitors
Amino Acid Sequence
Substitution reactions
Peptides

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Ridky, T. W., Bizub-Bender, D., Cameron, C. E., Weber, I. T., Wlodawer, A., Copeland, T., ... Leis, J. (1996). Programming the Rous sarcoma virus protease to cleave new substrate sequences. Journal of Biological Chemistry, 271(18), 10538-10544. https://doi.org/10.1074/jbc.271.18.10538
Ridky, Todd W. ; Bizub-Bender, Diane ; Cameron, Craig E. ; Weber, Irene T. ; Wlodawer, Alexander ; Copeland, Terry ; Skalka, Anna Marie ; Leis, Jonathan. / Programming the Rous sarcoma virus protease to cleave new substrate sequences. In: Journal of Biological Chemistry. 1996 ; Vol. 271, No. 18. pp. 10538-10544.
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Ridky, TW, Bizub-Bender, D, Cameron, CE, Weber, IT, Wlodawer, A, Copeland, T, Skalka, AM & Leis, J 1996, 'Programming the Rous sarcoma virus protease to cleave new substrate sequences', Journal of Biological Chemistry, vol. 271, no. 18, pp. 10538-10544. https://doi.org/10.1074/jbc.271.18.10538

Programming the Rous sarcoma virus protease to cleave new substrate sequences. / Ridky, Todd W.; Bizub-Bender, Diane; Cameron, Craig E.; Weber, Irene T.; Wlodawer, Alexander; Copeland, Terry; Skalka, Anna Marie; Leis, Jonathan.

In: Journal of Biological Chemistry, Vol. 271, No. 18, 20.05.1996, p. 10538-10544.

Research output: Contribution to journalArticle

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Ridky TW, Bizub-Bender D, Cameron CE, Weber IT, Wlodawer A, Copeland T et al. Programming the Rous sarcoma virus protease to cleave new substrate sequences. Journal of Biological Chemistry. 1996 May 20;271(18):10538-10544. https://doi.org/10.1074/jbc.271.18.10538