Our goal is to understand the role of heat shock and related proteins in cells during normal growth and periods of stress. Our studies will involve a combined genetic and biochemical approach, using as model systems, the two organisms that are particularly amenable to such analysis, S. cerevisiae and E. coli. The yeast genome contains a family of genes related to Hsp70 of other eucaryotes and dnaK of E. coli. The proteins encoded by this gene family will be analyzed. Antibodies specific for a single (or two closely related) 70kDa proteins will be isolated and used to purify the individual 70kDa proteins. To determine functional similarities and differences amongst the related proteins, we will determine the cellular location of these yeast proteins and analyze their biochemical properties. In E. coli, the heat shock genes, dnaK and htpG, which are related to the Hsp70 and Hsp83 genes of eucaryotes. respectively. will be studied. Second-site suppressors of dnaK deletion and point mutations will be isolated and characterized. Identification and characterization of suppressor genes will provide information concerning the proteins that interact with DnaK or can bypass DnaK function. Several strategies will be used to isolate additional dnaK mutations. Since previously isolated strains containing dnaK mutations have a complex set of phenotypes, our goal is to isolate new dnaK mutants that have subsets of these phenotypes. If the phenotypes are separable. we may, by analysis of the mutants, be able to define functional domains. Strains containing mutations in htpG are slightly temperature sensitive for growth. We will attempt to identify genes whose function is essential only in the absence of htpG. Identification of such genes should lead to a better understanding of htpG function. Also, we will determine if the protein encoded by htPG. C62.5, will complement the hsp83 mutants of yeast, to address the question of whether the functions, of at least some, heat shock proteins have been conserved in evolution.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM027870-15
Application #
2175019
Study Section
Microbial Physiology and Genetics Subcommittee 2 (MBC)
Project Start
1980-04-01
Project End
1997-03-31
Budget Start
1994-04-01
Budget End
1995-03-31
Support Year
15
Fiscal Year
1994
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Biochemistry
Type
Schools of Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Craig, Elizabeth A (2018) Hsp70 at the membrane: driving protein translocation. BMC Biol 16:11
Schilke, Brenda A; Ciesielski, Szymon J; Ziegelhoffer, Thomas et al. (2017) Broadening the functionality of a J-protein/Hsp70 molecular chaperone system. PLoS Genet 13:e1007084
Dutkiewicz, Rafal; Nowak, Malgorzata; Craig, Elizabeth A et al. (2017) Fe-S Cluster Hsp70 Chaperones: The ATPase Cycle and Protein Interactions. Methods Enzymol 595:161-184
Ciesielski, Szymon J; Craig, Elizabeth A (2017) Posttranslational control of the scaffold for Fe-S cluster biogenesis as a compensatory regulatory mechanism. Curr Genet 63:51-56
Craig, Elizabeth A; Marszalek, Jaroslaw (2017) How Do J-Proteins Get Hsp70 to Do So Many Different Things? Trends Biochem Sci 42:355-368
Lee, Kanghyun; Sharma, Ruchika; Shrestha, Om Kumar et al. (2016) Dual interaction of the Hsp70 J-protein cochaperone Zuotin with the 40S and 60S ribosomal subunits. Nat Struct Mol Biol 23:1003-1010
Delewski, Wojciech; Paterkiewicz, Bogumi?a; Manicki, Mateusz et al. (2016) Iron-Sulfur Cluster Biogenesis Chaperones: Evidence for Emergence of Mutational Robustness of a Highly Specific Protein-Protein Interaction. Mol Biol Evol 33:643-56
Ciesielski, Szymon J; Schilke, Brenda; Marszalek, Jaroslaw et al. (2016) Protection of scaffold protein Isu from degradation by the Lon protease Pim1 as a component of Fe-S cluster biogenesis regulation. Mol Biol Cell 27:1060-8
Schmitz-Abe, Klaus; Ciesielski, Szymon J; Schmidt, Paul J et al. (2015) Congenital sideroblastic anemia due to mutations in the mitochondrial HSP70 homologue HSPA9. Blood 126:2734-8
Yu, Hyun Young; Ziegelhoffer, Thomas; Craig, Elizabeth A (2015) Functionality of Class A and Class B J-protein co-chaperones with Hsp70. FEBS Lett 589:2825-30

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