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Licensed Unlicensed Requires Authentication Published by De Gruyter July 30, 2015

The double mutation L109M and R448M of HIV-1 reverse transcriptase decreases fidelity of DNA synthesis by promoting mismatch elongation

  • Bianca Heyn , Nicole Pogodalla and Susanne Brakmann EMAIL logo
From the journal Biological Chemistry

Abstract

Changes of Leu109 and Arg448 of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) have as yet not been associated with altered fitness. However, in a recent study, we described that the simultaneous substitution of L109 and R448 by methionine leads to an error-producing polymerase phenotype that is not observed for the isolated substitutions. The double mutant increased the error rate of DNA-dependent DNA synthesis 3.1-fold as compared to the wildtype enzyme and showed a mutational spectrum with a fraction of 28% frameshift mutations and 48% transitions. We show here that weaker binding of DNA:DNA primer-templates as indicated by an increased dissociation rate constant (koff) could account for the higher frameshift error rate. Furthermore, we were able to explain the prevalence of transition mutations with the finding that HIV-1 RT variant L109M/R448M preferred misincorporation of C opposite A and elongation of C:A mismatches.


Corresponding author: Susanne Brakmann, Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany, e-mail:

Acknowledgments

This work was supported by grants BR2219/3-2 and BR2219/3-3 from Deutsche Forschungsgemeinschaft, which is gratefully acknowledged. The authors would also like to express their gratitude to Prof. Dr. Martin Engelhard for many valuable discussions and suggestions.

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Supplemental Material

The online version of this article (DOI: 10.1515/hsz-2015-0115) offers supplementary material, available to authorized users.


Received: 2015-1-26
Accepted: 2015-7-20
Published Online: 2015-7-30
Published in Print: 2015-12-1

©2015 by De Gruyter

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