Comparison of Binding of Mixed Ribose-Deoxyribose Analogues of CUCU to a Ribozyme and to GGAGAA by Equilibrium Dialysis: Evidence for Ribozyme Specific Interactions with 2′ OH Groups

Philip C. Bevilacqua, Douglas H. Turner

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Abstract

Dissociation constants at 15 °C were measured by equilibrium dialysis for the binding of rCrUrCrU, dCrUrCrU, rCdUrCrU, rCrUdCrU, and rCrUrCdU to the L-21 ScaI form of the self-splicing group I LSU intron from Tetrahymena thermophila. Substitution of deoxyribose for ribose in each of the middle two positions makes the free energy change for binding 1-2 kcal/mol less favorable, compared to about 0.3 kcal/mol less favorable for each of the terminal positions. Dissociation constants for binding of the same oligomers to rGGAGAA were measured by optical melting methods. Substitution of a single deoxyribose for ribose makes the free energy change for binding less favorable by 0.4-0.9 kcal/mol for this simple duplex formation. Comparison of the effects for binding to ribozyme and to rGGAGAA indicate that ribozyme-specific tertiary interactions dependent on the middle two 2′ OH groups of rCrUrCrU add about 2 kcal/mol of favorable free energy for binding to L-21 ScaI. Comparisons are made with results from gel retardation studies [Pyle, A. M., McSwiggen, J. A., … Cech, T. R. (1990) Proc. Natl. Acad. Sci. U.S.A. 87, 8187-8191; Pyle, A. M., … Cech, T. R. (1991) Nature (London) 350, 628-631].

Original languageEnglish (US)
Pages (from-to)10632-10640
Number of pages9
JournalBiochemistry
Volume30
Issue number44
DOIs
StatePublished - Nov 1 1991

All Science Journal Classification (ASJC) codes

  • Biochemistry

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