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Regulation of a viral proteinase by a peptide and DNA in one-dimensional space. I. binding to DNA and to hexon of the precursor to protein VI, pVI, of human adenovirus


Graziano, Vito; McGrath, William J; Suomalainen, Maarit; Greber, Urs F; Freimuth, Paul; Blainey, Paul C; Luo, Guobin; Xie, X Sunney; Mangel, Walter F (2013). Regulation of a viral proteinase by a peptide and DNA in one-dimensional space. I. binding to DNA and to hexon of the precursor to protein VI, pVI, of human adenovirus. Journal of Biological Chemistry, 288(3):2059-2067.

Abstract

The precursor to adenovirus protein VI, pVI, is a multifunctional protein with different roles early and late in virus infection. Here we focus on two roles late in infection, binding of pVI to DNA and to the major capsid protein hexon. pVI bound to DNA as a monomer independent of DNA sequence with an apparent equilibrium dissociation constant, K(d(app.)), of 46 nM. Bound to double-stranded DNA, one molecule of pVI occluded 8 base pairs. Upon the binding of pVI to DNA, 3 sodium ions were displaced from the DNA. A ΔG of -4.54 kcal/mol for the nonelectrostatic free energy of binding indicated that a substantial component of the binding free energy resulted from nonspecific interactions between pVI and DNA. The proteolytically processed, mature form of pVI, protein VI, also bound to DNA; its K(d(app.)) was much higher, 307 nM. The binding assays were performed in 1 mM MgCl(2), because in the absence of magnesium, the binding to pVI or protein VI to DNA was too tight to determine a K(d(app.)). Three molecules of pVI bound to one molecule of the hexon trimer with an equilibrium dissociation constant K(d(app.)) of 1.1nM.

Abstract

The precursor to adenovirus protein VI, pVI, is a multifunctional protein with different roles early and late in virus infection. Here we focus on two roles late in infection, binding of pVI to DNA and to the major capsid protein hexon. pVI bound to DNA as a monomer independent of DNA sequence with an apparent equilibrium dissociation constant, K(d(app.)), of 46 nM. Bound to double-stranded DNA, one molecule of pVI occluded 8 base pairs. Upon the binding of pVI to DNA, 3 sodium ions were displaced from the DNA. A ΔG of -4.54 kcal/mol for the nonelectrostatic free energy of binding indicated that a substantial component of the binding free energy resulted from nonspecific interactions between pVI and DNA. The proteolytically processed, mature form of pVI, protein VI, also bound to DNA; its K(d(app.)) was much higher, 307 nM. The binding assays were performed in 1 mM MgCl(2), because in the absence of magnesium, the binding to pVI or protein VI to DNA was too tight to determine a K(d(app.)). Three molecules of pVI bound to one molecule of the hexon trimer with an equilibrium dissociation constant K(d(app.)) of 1.1nM.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Molecular Life Sciences
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:2013
Deposited On:11 Oct 2012 14:05
Last Modified:07 Aug 2017 03:57
Publisher:American Society for Biochemistry and Molecular Biology
ISSN:0021-9258
Additional Information:This research was originally published in Journal of Biological Chemistry. Graziano V et al: Regulation of a Viral Proteinase by a Peptide and DNA in One-dimensional Space I. BINDING TO DNA AND TO HEXON OF THE PRECURSOR TO PROTEIN VI, pVI, OF HUMAN ADENOVIRUS. 2012; 288:2059-2067 © the American Society for Biochemistry and Molecular Biology.
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1074/jbc.M112.377150
PubMed ID:23043136

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