EcoRI* Specificity and Hydrogen Bonding
- 1 January 1982
- journal article
- research article
- Published by Mary Ann Liebert Inc in DNA
- Vol. 1 (2), 117-124
- https://doi.org/10.1089/dna.1.1982.1.117
Abstract
Under standard conditions, Eco RI endonuclease uniquely recognizes the inverted repeat GAATTC. However, this specificity breaks down under non-standard conditions into what has been termed Eco RI* specificity, wherein many other sequences are recognized. We show here that the hydrolysis rates at all known Eco RI* sites can be summarized by the hierarchies: G > > A > T > > C at the first position, A > > [G, C] > > T at the second and third position, and the corresponding complements at the last three positions. This is consistent with a recognition model which assumes that there are two specific hydrogen bonds per base pair under standard conditions. One or more of these are randomly replaced by water under Eco RI* conditions and the position of a sequence within the appropriate hierarchy is primarily determined by the number of retained hydrogen bonds. These retained hydrogen bonds are common recognition features that can be identified by examining the DNA. The recognition points thereby identified for Eco RI all fall within the major groove of the DNA.Keywords
This publication has 18 references indexed in Scilit:
- Cloning and Sequencing of Restriction Fragments Generated byEcoRI*DNA, 1982
- Structure of catabolite gene activator protein at 2.9 Å resolution suggests binding to left-handed B-DNANature, 1981
- Cation Dependence of Restriction Endonuclease EcoRI ActivityEuropean Journal of Biochemistry, 1981
- Preliminary X-ray diffraction studies of EcoRI restriction endonuclease-DNA complexJournal of Molecular Biology, 1981
- Nucleotide Sequence Specificity of Restriction EndonucleasesScience, 1979
- Structures and mechanisms of DNA restriction and modification enzymesQuarterly Reviews of Biophysics, 1979
- EcoRI★ activity: Enzyme modification or activation of accompanying endonuclease?Gene, 1978
- Preliminary X-ray diffraction analysis of crystalline EcoRI endonucleaseJournal of Molecular Biology, 1978
- Altering the specificity of restriction endonuclease: effect of replacing Mg2+ with Mn2+Biochemistry, 1978
- Restriction and modification of a self-complementary octanucleotide containing the EcoRI substrateJournal of Molecular Biology, 1975