Research

Membrane transport proteins – channels and energy-coupled pumps – are the molecular gatekeepers of the cell.  For microbes afloat in a hostile environment, these proteins import vital nutrients and export dangerous toxins.  Bacteria have contended with vast and unusual chemical threats throughout evolutionary time, and retain a catalog of idiosyncratic export proteins to deal with hostile elements. Delving deeply into bacterial export systems reveals novel physiologies and structural surprises.  By understanding bacteria’s intrinsic vulnerabilities, we can generate new leads on antimicrobials.

My lab focuses on discovering and understanding these  membrane proteins. We have discovered exporters of two different toxic ions: fluoride (F-) and guanidinium (Gdm+).

We have four big questions:

  • what do they look like?
  • how do they work?
  • how did they evolve?
  • what is their biological role?

We use a breadth of biochemical and biophysical techniques, including: electrophysiology, membrane protein biochemistry, X-ray crystallography, macromolecular NMR, and phylogenetic.  Here is a sampling of some of the lab’s current projects: