The University of Arizona

Elizabeth Vierling

Professor of Biochemistry & Molecular Biophysics and Molecular & Cellular Biology
Ph.D., University of Chicago

Biochemistry and function of molecular chaperones, plant molecular biology.

Research Interests

We are studying the biological roles and the mechanism of action of molecular vierling1chaperones in higher plants (including Arabidopsis) and the model single-celled organisms, the cyanobacterium Synechocystis. Molecular chaperones are proteins that bind to other proteins that are in unstable structural states. They thereby facilitate many cellular processes, including folding of substrates, transport of proteins across membranes, modulation of protein activity, and prevention of irreversible protein aggregation. We are interested in the roles of chaperones in the survival of plants and other organisms during stress (particularly high temperature) and also during normal development. Research approaches include biochemistry of isolated proteins, production of transgenic plants, and analysis of plant and cyanobacterial mutants. We have developed a model for activity of the small (s) HSPs (15-30 kDa), a ubiquitous class of molecular vierling2chaperones. We propose that sHSPs bind to denatured proteins and maintain them in a form competent for reactivation/refolding by other cellular components. The structural basis of this activity is being tested by site-directed mutation, and genetic vierling3analysis is being pursued in Synechocytstis. Using Arabidopsis, we are also searching for mutants defective in chaperone activities. Other work concerns the HSP100 proteins, which are known to be critical for thermotolerance in yeast. We have isolated Arabidopsis mutants defective in HSP101, and shown these mutants lack thermotolerance. Manipulating HSP100 gene expression may offer a means to improve temperature tolerance of plants.

Select Publications

Any link on the below references will take you off of the BMCB site and to an abstract of that particular paper.

Giese, K.C., E. Basha, B.Y. Catague, and E. Vierling. 2005. Evidence for an essential function of the N terminus of a small heat shock protein in vivo, independent of in vitro chaperone activity. Proceedings of the National Academy of Sciences U.S.A. 102: 18896-18901.

Larkindale, J., J.D. Hall, M.R. Knight, and E. Vierling. 2005. Heat stress phenotypes of Arabidopsis mutants implicate multiple signaling pathways in the acquisition of thermotolerance. Plant Physiology 138: 882-897.

Lee, U., C. Wie, M. Escobar, B. Williams, S.W. Hong, and E. Vierling. 2005. Genetic analysis reveals domain interactions of Arabidopsis Hsp100/ClpB and cooperation with the small heat shock protein chaperone system. The Plant Cell 17: 559-571.

Giese, K.C., and E. Vierling. 2004. Mutants in a small heat shock protein that affect the oligomeric state. Analysis and allele-specific suppression. Journal of Biological Chemistry 279: 32674-32683.

Basha, E., G.J. Lee, B. Demeler, and E. Vierling. 2004. Chaperone activity of cytosolic small heat shock proteins from wheat. European Journal of Biochemistry 271: 1426-1436.

Basha, E., G.J. Lee, L.A. Breci, A.C. Hausrath, N.R. Buan, K.C. Giese, and E. Vierling. 2004. The identity of proteins associated with a small heat shock protein during heat stress in vivo indicates that these chaperones protect a wide range of cellular functions. Journal of Biological Chemistry 279: 7566-7575.

Friedrich, K.L., K.C. Giese, N.R. Buan, and E. Vierling. 2004. Interactions between small heat shock protein subunits and substrate in small heat shock protein-substrate complexes. Journal of Biological Chemistry 279: 1080-1089.

Liu, Z., S.W. Hong, M. Escobar, E. Vierling, D.L. Mitchell, D.W. Mount, and J.D. Hall. 2003. Arabidopsis UVH6, a homolog of human XPD and yeast RAD3 DNA repair genes, functions in DNA repair and is essential for plant growth. Plant Physiology 132: 1405-1414.

Hong, S.W., U. Lee, and E. Vierling. 2003. Arabidopsis hot mutants define multiple functions required for acclimation to high temperatures. Plant Physiology 132: 757-767.

Giese, K.C., E. Vierling. 2002. Changes in oligomerization are essential for the chaperone activity of a small heat shock protein in vivo and in vitro. Journal of Biological Chemistry 277: 46310-46318.

Van Montfort, R., C. Slingsby, and E. Vierling. 2001. Structure and function of the small heat shock protein/alpha-crystallin family of molecular chaperones. Advances in Protein Chemistry 59: 105-56.

Van Montfort, R., E. Basha, K.L. Friedrich, C. Slingsby, and E. Vierling. 2001. Crystal structure and assembly of a eukaryotic small heat shock protein. Nature Structural Biology 8: 1025-1030

Hong, S.-W., and E.Vierling. 2001. Hsp101 is necessary for heat tolerance but dispensable for development and germination in the absence of stress. Plant Journal 27: 25-35.

Contact Information

    Mailing:
    Elizabeth Vierling, Professor
    Department of Biochemistry & Molecular Biophysics
    University of Arizona
    Life Sciences South 352
    P.O. Box 210106
    Tucson AZ 85721-0106

    Web Site: Home Page

    Telephone:
    520-621-1601 (Office)
    520-621-3977 (Lab)

    Fax:
    520-621-3709

    Email:
    vierling@email.arizona.edu

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