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Design and Use of a Low Cost, Automated Morbidostat for Adaptive Evolution of Bacteria Under Antibiotic Drug Selection

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Structural-based analysis of dihydrofolate reductase evolution.

David Hecht¹, Jonathan Tran, Gary B Fogel

¹Southwestern College, 900 Otay Lakes Rd., Chula Vista, CA 91910, USA. dhecht@swccd.edu

Molecular Phylogenetics and Evolution

|June 28, 2011

Summary

This summary is machine-generated.

This study analyzed dihydrofolate reductase (DHFR) evolution using structural data. Active-site residues show higher conservation than non-active sites, aiding predictions for future DHFR evolution against new therapies.

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Area of Science:

Biochemistry
Structural Biology
Evolutionary Biology

Background:

Dihydrofolate reductase (DHFR) is a crucial enzyme in folate metabolism.
Understanding DHFR evolution provides insights into drug resistance mechanisms.
Previous studies relied on sequence-based alignments, potentially missing structural nuances.

Purpose of the Study:

To investigate the evolutionary trajectory of DHFR using a structure-based approach.
To quantify residue conservation considering both amino acid and structural properties.
To correlate evolutionary patterns with enzyme function and potential therapeutic interventions.

Main Methods:

Generated a structure-based amino acid sequence alignment of wild-type DHFR from PDB crystal structures.
Developed a conservation metric incorporating residue identity, secondary structure, and residue class.
Constructed a phylogenetic tree based on the structure-aligned sequences.

Main Results:

The structure-based alignment generated a reliable phylogenetic tree comparable to canonical phylogenies.
Active-site residues demonstrated significantly higher conservation in both sequence and structure compared to non-active site residues.
Conservation patterns were analyzed across different residue types and secondary structure elements.

Conclusions:

Structural information enhances the accuracy of evolutionary analyses for DHFR.
Highly conserved active-site residues are critical for DHFR function and stability.
These findings can inform the development of novel therapies targeting DHFR and overcoming resistance.