Valley Stewart

Valley Stewart viewing Lake Tahoe

Position Title
Professor Emeritus

  • Microbiology and Molecular Genetics

Research Interests

Anaerobic respiration and nitrogen metabolism in Escherichia coli and Klebsiella grimontii. Physiology and genetics of plant-pathogenic Xanthomonas spp.

Education and Degree(s)
  • 1977 B.A. in Biology, University of Colorado
  • 1982 Ph.D. in Microbiology, University of Virginia
  • 1985 Postdoc in Molecular Genetics, Stanford University
  • Stewart, V., and P. C. Ronald. 2022. Sulfotyrosine residues: interaction specificity determinants for extracellular protein-protein interactions. J. Biol. Chem. 298: in press. PMID:35798140
  • Stewart, V., and P. C. Ronald. 2021. The Xanthomonas RaxH-RaxR two-component regulatory system is orthologous to the zinc-responsive Pseudomonas ColS-ColR system. Microorganisms 9:1458. PMCID: PMC8306577
  • Joe, A., V. Stewart, and P. C. Ronald. 2021. The HrpX protein activates synthesis of the RaxX sulfopeptide, required for activation of XA21-mediated immunity to Xanthomonas oryzae pv. oryzae. Mol. Plant Microbe Interact. 34:1307-1315. PMID: 34731589
  • Liu, F., M. McDonald, B. Schwessinger, A. Joe, R. Pruitt, T. Erickson, X. Zhao, V. Stewart, and P. C. Ronald. 2019. Variation and inheritance of the Xanthomonas raxX-raxSTAB gene cluster required for activation of XA21-mediated immunity. Mol. Plant Pathol. 20:656-672. PMID: 30773771
  • Huynh, T. N., and V. Stewart. 2011. Negative control in two-component signal transduction by transmitter phosphatase activity. Mol. Microbiol. 82:275-286. PMCID: PMC3192241