Stan Roux

Stan Roux

	Professor Ph.D. Yale University, 1971 sroux@uts.cc.utexas.edu Office BIO 16 (512) 471-4238 Roux Lab home page
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We are studying how the environmental stimuli of light and gravity alter patterns of growth and development in plants. We are using molecular approaches to characterize proteins that are critically involved in mediating the coupling of light and gravity stimuli to morphogenic changes in plants. For our studies of light-induced signal transduction we are focusing on potential signaling proteins that function primarily or partially in the nucleus. Nuclear proteins we have recently characterized include an annexin, an apyrase (= NTPase), a CK II protein kinase, lamins, a nucleolin, protein phosphatases and Ran (a monomeric GTP-binding protein). For most of these proteins, we have characterized their cDNAs and documented the effects of light on the abundance of mRNAs that encode them. For several of them we are now are studying the phenotypes of transgenic Arabidopsis plants that ectopically express the sense or antisense versions of their genes. We have raised antibodies to most of these proteins to help us immunolocalize them and quantitate their expression. Most of the proteins carry out their nuclear functions in partnership with other proteins. To help define these binding partners we are employing the yeast two-hybrid system. Our investigations of the molecular biology of these proteins should help to clarify how they function in plant photomorphogenesis.

Selected Publications Thomas, C., Y. Sun, K. Naus, A. Lloyd, and S. J. Roux. (1999) Apyrase functions in plant phosphate nutrition and mobilizes phosphate from extracellular ATP. Plant Physiol. 119, 543-551. Lee, Y., A. M. Lloyd, and S. J. Roux. (1999) Antisense expression of the CK2 a-subunit gene in Arabidopsis. Effects on light-regulated gene expression and plant growth. Plant Physiol. 119, 989-1000. Nematollahi, W. P. and S. J. Roux. (1999) A novel -glucosidase from the cell wall of maize (Zea mays L.): rapid purification and partial characterization. J. Plant Physiol. 155, 462-69. Chatterjee, A., D. M. Porterfield, P. Smith, and S. J. Roux. (2000) Gravity-directed calcium current in germinating spores of Ceratopteris. Planta 210, 607-610. Thomas, C., A. Rajagopal, B. Windsor, R. Dudler, A. Lloyd, and S. J. Roux. (2000) A role for ecto-phosphatase in multiple drug resistance. Plant Cell 12, 519-533.

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