Abstract
According to the currently accepted model, enzymes searching for specific recognition sequences or structural elements (modified nucleotides, breaks, single-stranded DNA fragments, etc.) slide at a high rate along DNA. Such sliding is possible only if the enzymes possess sufficiently high affinity for all DNA, sequence notwithstanding. Therefore, significant differences in their affinity for specific and nonspecific DNA sequences are unlikely, and the formation of a complex between an enzyme and its target DNA is not a basic factor of enzyme specificity. To elucidate such factors, we have analyzed many DNA replication, DNA repair, topoisomerization, integration, and recombination enzymes using a number of physicochemical methods, including the method of stepwise increase in ligand complexity developed in our laboratory. It has been shown that high affinity of all studied enzymes for long DNAs is provided by the formation of many weak contacts of the enzyme with all nucleotide units covered by the protein globule. The main role lies in the contact between positively charged amino acid residues and internucleoside phosphate groups; however, the contribution of each contact is very small, and the full contact interface usually resembles that characteristic of interactions between oppositely charged biopolymer surfaces. In some cases, a significant contribution to the affinity is made through hydrophobic and/or van der Waals interactions of the enzymes with nucleotide bases. On the whole, such nonspecific interactions provide for five to eight orders of enzyme affinity for DNA, depending on the enzyme. Specific interactions of enzymes with long DNAs, in contrast to their contacts with small ligands, are usually weak and comparable in efficiency with weak nonspecific contacts. The sum of specific interactions most often provides for approximately one or, rarely, two orders of affinity. According to structural data, DNA binding to any of the investigated enzymes is followed by a stage of DNA conformation adjustment, which includes partial or complete DNA melting, deformation of its backbone, stretching, compression, bending or kinking, eversion of nucleotides from the DNA helix, etc. The full set of such changes is specific for each individual enzyme. The fact that all enzyme-dependent changes in DNA are effected through weak specific (rather than strong) interactions is very important. Enzyme-specific changes in DNA conformation are required for effective adjustment of reacting orbitals to an accuracy of 10°–15°, which is possible only in the case of specific DNAs. A transition from nonspecific to specific DNA leads to an increase in the reaction rate (k cat) by four to eight orders of magnitude. Thus, the stages of DNA conformation adjustment and catalysis proper provide for the high specificity of enzyme action.
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Nevinsky, G.A. The Role of Weak Specific and Nonspecific Interactions in Enzymatic Recognition and Conversion of Long DNAs. Molecular Biology 38, 636–662 (2004). https://doi.org/10.1023/B:MBIL.0000043935.99590.ba
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DOI: https://doi.org/10.1023/B:MBIL.0000043935.99590.ba