The major objective of this proposal is to elucidate how the N protein of coliphage lambda controls gene expression by modulating transcription termination. Components of this transcription proteins called Nus, transcription termination signals and an antitermination signal, nut. Genetic studies coupled with physiological experiments are directed toward: 1) characterizing the structure and function of the host NusA and NusE proteins, 2) identifying a new host factor suspected of being involved in antitermination, 3) determining if a host protein binds to the boxA component of the nut RNA signal, and if an antitermination complex formed at one nut site can be donated in trans to a second nut site, 4) assessing a new and unexpected finding that the promoter influences nut activity, and 5) extending studies on the nucleic acid signals for transcription termination. In a related project, we will extend studies on a host factor, Sip, that appears to modulate the binding to DNA of the C1 transcription factor of lambdoid phage P22. This genetic approach should continue to facilitate biochemical analysis, and to point the way toward new avenues of study of antitermination. The well-characterized lambda N system should continue to serve as a useful model for studies on eukaryotic expression systems thought to be regulated by antitermination, such as TAT regulation of HIV expression and c-myc tran ription.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI011459-23
Application #
2059799
Study Section
Microbial Physiology and Genetics Subcommittee 2 (MBC)
Project Start
1976-09-01
Project End
1996-07-31
Budget Start
1995-08-01
Budget End
1996-07-31
Support Year
23
Fiscal Year
1995
Total Cost
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Tyler, Jessica S; Beeri, Karen; Reynolds, Jared L et al. (2013) Prophage induction is enhanced and required for renal disease and lethality in an EHEC mouse model. PLoS Pathog 9:e1003236
Bubunenko, Mikhail; Court, Donald L; Al Refaii, Abdalla et al. (2013) Nus transcription elongation factors and RNase III modulate small ribosome subunit biogenesis in Escherichia coli. Mol Microbiol 87:382-93
Friedman, David I; Mozola, Cara C; Beeri, Karen et al. (2011) Activation of a prophage-encoded tyrosine kinase by a heterologous infecting phage results in a self-inflicted abortive infection. Mol Microbiol 82:567-77
Eaton, Kathryn A; Friedman, David I; Francis, Gayle J et al. (2008) Pathogenesis of renal disease due to enterohemorrhagic Escherichia coli in germ-free mice. Infect Immun 76:3054-63
Tyler, Jessica S; Mills, Melissa J; Friedman, David I (2004) The operator and early promoter region of the Shiga toxin type 2-encoding bacteriophage 933W and control of toxin expression. J Bacteriol 186:7670-9
Livny, Jonathan; Friedman, David I (2004) Characterizing spontaneous induction of Stx encoding phages using a selectable reporter system. Mol Microbiol 51:1691-704
Tyler, Jessica S; Friedman, David I (2004) Characterization of a eukaryotic-like tyrosine protein kinase expressed by the Shiga toxin-encoding bacteriophage 933W. J Bacteriol 186:3472-9
Zhou, Y; Mah, T F; Yu, Y T et al. (2001) Interactions of an Arg-rich region of transcription elongation protein NusA with NUT RNA: implications for the order of assembly of the lambda N antitermination complex in vivo. J Mol Biol 310:33-49
Neely, M N; Friedman, D I (2000) N-mediated transcription antitermination in lambdoid phage H-19B is characterized by alternative NUT RNA structures and a reduced requirement for host factors. Mol Microbiol 38:1074-85
Huang, C; Wolfgang, M C; Withey, J et al. (2000) Charged tmRNA but not tmRNA-mediated proteolysis is essential for Neisseria gonorrhoeae viability. EMBO J 19:1098-107

Showing the most recent 10 out of 19 publications