My laboratory has two major research focuses. The first is to understand the pre-mRNA splicing machinery on a molecular level, using X-ray crystallography in combination with molecular biological, biochemical, and biophysical approaches. Splicing of pre-mRNA is essential for gene expression in all eukaryotes. In higher eukaryotes such as mammals, an average of 95% of the nucleotides in the primary transcript (pre-mRNA) of a protein-encoding gene are introns. These introns need to be precisely removed by splicing before the mRNA can be transported out of the nucleus and translated. Even a single nucleotide error causes catastrophic consequences. Aberrant splicing contributes to at least 15% of human genetic disorders and causes many other diseases such as cancer. A thorough understanding of the pre-mRNA splicing pathway may provide useful approaches for human disease therapy. The splicing of pre-mRNA is carried out through two transesterification reactions catalyzed by spliceosome, a huge macromolecular complex (approximately 4.8 MDa) that contains five RNAs and numerous (over 145 in human) protein splicing factors. Among the large amount of protein factors, protein/protein, and protein/RNA complexes in the spliceosome, many of them await detailed structural analyses. Crystallographic analyses (in combination with molecular biology, biochemical, and biophysical approaches) of these individual proteins and complexes in the spliceosome will provide valuable insight into intron recognition, spliceosome formation, and catalytic mechanism.
Our second research area focuses on structure-based drug design targeting bacterial signal transduction systems and transcriptional complexes critical in breast tumorigenesis. Structure-based drug design is a valuable tool in modern drug discovery which can save years of time and millions of dollars compared to traditional trial-and-error drug development processes. Similar approaches have successfully generated drugs that battle various human diseases such as HIV. We hope our structure-based drug design efforts contribute to the development of new antibiotics and anti-cancer drugs.
Representative Publications:
Shen, H., X. Zheng, J. Shen, L. Zhang, R. Zhao, M. R. Green (2008). Distinct activities of the DExD/H-box splicing factor hUAP56 facilitate stepwise assembly of the spliceosome. Genes & Development. 22, 1796-1803
Guarnieri, M., L. Zhang, J. Shen, R. Zhao (2008). The Hsp90 inhibitor radicicol interacts with the ATP-binding pocket of bacterial sensor kinase PhoQ. J. Mol. Biol. 379, 82-93.
Shen, J., L. Zhang, R. Zhao (2007). Biochemical characterization of the ATPase and helicase activity of UAP56, an essential pre-mRNA splicing factor and mRNA export factor. J. Biol. Chem. 282, 22544-22550.
Zhang, L., J. Shen, M. Guarnieri, A. Heroux., K. Yang, R. Zhao (2007). Crystal structure of the C-terminal domain of splicing factor Prp8 carrying retinitis pigmentosa mutants. Protein Science, 16, 1024-1031.
Pena, P. V., F. Davrazou, X. Shi, K. Walter, V. V. Verkhusha, O. Gozani, R. Zhao, and T. G. Kutateladze (2006). Molecular mechanism of H3K4Me3 recognition by Plant Homeodomain of Inhibitor of Growth 2 tumor suppressor. Nature, 442, 100-103.
Zhao, R.*, J. Shen, M. R. Green, M. MacMorris and T. Blumenthal (2004). Crystal structure of UAP56, a DExD/H-box protein involved in pre-mRNA splicing and mRNA export. Structure, 12, 1373-1381. (*. Corresponding author)
Gai, D., R. Zhao, D. Li, C.V. Finkielstein, X. S. Chen (2004). Mechanisms of conformational changes for a replicative hexameric helicase of SV40 Large Tumor antigen. Cell, 119, 47-60.
Li, D.*, R. Zhao*, W. Lilyestrom, D. Gai, R. Zhang, J. A. Decaprio, E. Fanning, A. Jochimiak, G. Szakonyi, and X. S. Chen (2003). Structure of the replicative helicase of the oncoprotein SV40 large tumour antigen. Nature, 423, 512-518. (* Equal contributions)
Zhao, R., E. J. Collins, R. B. Bourret, and R. E. Silversmith (2002). Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ. Nature Structural Biology, 9, 570-575.
Zhao, R., D. J. Loftus, E. Appella, and E. J. Collins (1999). Structural evidence of T cell xeno-reactivity in the absence of molecular mimicry. Journal of Experimental Medicine, 189, 359-370.
Zhao, R., D.C. Pevear, M.J. Kremer, V. Giranda, J. Kofron, R. Kuhn and M. G. Rossmann (1996). Human Rhinovirus 3 at 3.0Å resolution. Structure, 4, 1205-1220
Back to Top
|
