Cited by 623DNA and Nucleic Acid ChemistryRNA and protein synthesis mechanismsAdvanced biosensing and bioanalysis techniques

Thermodynamics and NMR of Internal G·T Mismatches in DNA

Allawi, Hatim T., SantaLucia, John·1997·Biochemistry

Abstract

Thermodynamics of 39 oligonucleotides with internal G.T mismatches dissolved in 1 M NaCl were determined from UV absorbance versus temperature profiles. These data were combined with literature values of six sequences to derive parameters for 10 linearly independent trimer and tetramer sequences with G.T mismatches and Watson-Crick base pairs. The G.T mismatch parameters predict DeltaG degrees 37, DeltaH degrees , DeltaS degrees , and TM with average deviations of 5.1%, 7.5%, 8.0%, and 1.4 degrees C, respectively. These predictions are within the limits of what can be expected for a nearest-neighbor model. The data show that the contribution of a single G.T mismatch to helix stability is context dependent and ranges from +1.05 kcal/mol for AGA/TTT to -1.05 kcal/mol for CGC/GTG. Several tests of the applicability of the nearest-neighbor model to G.T mismatches are described. Analysis of imino proton chemical shifts show that structural perturbations from the G.T mismatches are highly localized. One-dimensional NOE difference spectra demonstrate that G.T mismatches form stable hydrogen-bonded wobble pairs in diverse contexts. Refined nearest-neighbor parameters for Watson-Crick base pairs are also presented.

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Crossref · 10.1021/bi962590c

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  • For DNAs, duplex stabilities including effects of mismatches can be reliably estimated based on nearest neighbor interactions.

    “for DNAs, duplex stabilities including effects of mismatches can be reliably estimated based on nearest neighbor interactions [40].”

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Authors
Allawi, H. T., & SantaLucia, J.
Affiliations
Wayne State University (US)
Corresponding author
SantaLucia, John
Venue
Biochemistry
Published
1997-08-26
Volume
36
Issue
34
Pages
10581-10594
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2125882871
Cited by
623
References
0
Citations by year
2026: 14 · 2025: 19 · 2024: 22 · 2023: 15 · 2022: 32 · 2021: 22 · 2020: 11 · 2019: 19 · 2018: 17 · 2017: 15 · 2016: 10 · 2015: 28 · 2014: 15 · 2013: 20 · 2012: 22
FWCI
3.88
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Advanced biosensing and bioanalysis techniques
Keywords
G-T mismatch, DNA thermodynamics, oligonucleotide stability, nearest-neighbor model, helix stability, melting point, enthalpy and entropy, Watson-Crick base pairing
MeSH terms
Base Composition, DNA, Hydrogen Bonding, Magnetic Resonance Spectroscopy, Nucleic Acid Conformation, Nucleic Acid Heteroduplexes, Oligodeoxyribonucleotides, Regression Analysis, RNA, Double-Stranded, Sodium Chloride, Spectrophotometry, Ultraviolet, Temperature, Thermodynamics

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