Robert Landick

Robert Landick
Professor

Ph.D., University of Michigan, 1983
Postdoctoral Research: Stanford University 

Address: 5441 Microbial Sciences Building

Telephone: 608-265-8475

E-mail:

Department: Biochemistry

Research Interests

RNA polymerase structure/function; regulation of RNA chain elongation 

Research Fields

Microbial Genetics
Gene Expression 

Research Description:

We study regulatory mechanisms that control gene expression through changes in RNA chain elongation in organisms ranging from bacteria and humans. E. coli offers an ideal model system in which to ask detailed questions about RNA chain elongation and its control. We are tackling the problem by first analyzing the interaction of RNA polymerase with RNA and DNA sequences and structures that direct pausing, arrest, and termination during chain elongation. We parallel these biochemical studies with genetic analysis of RNA polymerase. Using methods for regulated overproduction of the b and b’ subunits of RNA polymerase, we have isolated and studied amino acid substitutions that alter transcriptional termination or that compromise cell growth. We are now analyzing subunit interactions by isolating suppressors of some of these substitutions. We also collaborate to use biophysical methods of optical microscopy for single-molecule analysis of transcription and 2D electron crystallography to study the activity and structure of transcription complexes. Finally, we have undertaken a study of RNA chain elongation by human RNA polymerase II that is beginning to reveal the nature of signals that control its transcript elongation. 

Representative Publications:

Search PubMed for more publications by Robert Landick

Palangat, M., T. I. Meier, R. G. Keene and R. Landick. 1998. Transcriptional pausing at +62 of the HIV-1 nascent RNA modulates formation of the TAR RNA structure. Mol. Cell 1:1033-1042. 

Wang, D., K. Severinov, and R. Landick. 1997. Preferential interaction of the his pause RNA hairpin with RNA polymerase β subunit residues 904-950 correlates with strong transcriptional pausing, Proc. Natl. Acad. Sci. USA 94:8433-8438. 

Heisler, L. M., G. Feng, D. J. Jin, C. A. Gross, and R. Landick. 1996. Amino acid substitutions in the two largest subunits of Escherihcia coli RNA polymerase that suppress a Defective Rho termination factor affect different parts of the transcription complex.