Structural-based analysis of dihydrofolate reductase evolution - PubMed

Structural-based analysis of dihydrofolate reductase evolution

David Hecht et al. Mol Phylogenet Evol. 2011 Oct.

Abstract

The evolution of dihydrofolate reductase (DHFR) was studied through a comprehensive structural-based analysis. An amino acid sequence alignment was generated from a superposition of experimentally determined X-ray crystal structures of wild-type (wt) DHFR from the Protein Data Bank (PDB). Using this structure-based alignment of DHFR, a metric was generated for the degree of conservation at each alignment site - not only in terms of amino acid residue, but also secondary structure, and residue class. A phylogenetic tree was generated using the alignment that compared favorably with the canonical phylogeny. This structure-based alignment was used to confirm that the degree of conservation of active-site residues in terms of both sequence as well as structure was significantly greater than non-active site residues. These results can be used in helping to understand the likely future evolution of DHFR in response to novel therapies.

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