The long term goals of this project are to define the mechanism for calmodulin (CaM) regulation of Bordetella pertussis adenylate cyclase and to elucidate the mechanism for entry of the enzyme into animal cells. B. pertussis is the pathogen responsible for whooping cough and the organism releases several toxins into its growth media including a CaM sensitive adenylate cyclase. Recent evidence from our laboratory using a highly purified B. pertussis adenylate cyclase demonstrated that the enzyme preparation can cause significant increases in intracellular cAMP of animal cells. We hypothesize that the enzyme enters animal cells, is activated by CaM, and elevates intracellular cAMP levels. The specific objectives of this proposal include purification of the enzyme to homogeneity, elucidation of its subunit composition and quaternary structure and identification of its catalytic subunit and CaM binding subunits by affinity labeling with 8-azido[3H]ATP and azido[125I]CaM. Furthermore, we propose to demonstrate unambiguously that the enzyme enters animal cells and to define the mechanism for cellular entry. The availability of the highly purified toxin may aid in the development of a safer vaccine for whooping cough and the study should contribute to a better understanding of the molecular basis of B. pertussis pathology.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM031708-05
Application #
3279966
Study Section
Microbial Physiology and Genetics Subcommittee 2 (MBC)
Project Start
1982-09-01
Project End
1989-03-31
Budget Start
1987-04-01
Budget End
1988-03-31
Support Year
5
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Washington
Department
Type
Schools of Medicine
DUNS #
135646524
City
Seattle
State
WA
Country
United States
Zip Code
98195
Oldenburg, D J; Storm, D R (1993) Identification of a domain in Bordetella pertussis adenylyl cyclase important for subunit interactions and cell invasion activity. Microb Pathog 15:153-7
Oldenburg, D J; Gross, M K; Smith, A L et al. (1993) Virulence of a Bordetella pertussis strain expressing a mutant adenylyl cyclase with decreased calmodulin affinity. Microb Pathog 14:489-93
Oldenburg, D J; Gross, M K; Wong, C S et al. (1992) High-affinity calmodulin binding is required for the rapid entry of Bordetella pertussis adenylyl cyclase into neuroblastoma cells. Biochemistry 31:8884-91
Gross, M K; Au, D C; Smith, A L et al. (1992) Targeted mutations that ablate either the adenylate cyclase or hemolysin function of the bifunctional cyaA toxin of Bordetella pertussis abolish virulence. Proc Natl Acad Sci U S A 89:4898-902
Donovan, M G; Storm, D R (1990) Evidence that the adenylate cyclase secreted from Bordetella pertussis does not enter animal cells by receptor-mediated endocytosis. J Cell Physiol 145:444-9
Masure, H R; Au, D C; Gross, M K et al. (1990) Secretion of the Bordetella pertussis adenylate cyclase from Escherichia coli containing the hemolysin operon. Biochemistry 29:140-5
Xia, Z G; Storm, D R (1990) A-type ATP binding consensus sequences are critical for the catalytic activity of the calmodulin-sensitive adenylyl cyclase from Bacillus anthracis. J Biol Chem 265:6517-20
Donovan, M G; Masure, H R; Storm, D R (1989) Isolation of a protein fraction from Bordetella pertussis that facilitates entry of the calmodulin-sensitive adenylate cyclase into animal cells. Biochemistry 28:8124-9
Au, D C; Masure, H R; Storm, D R (1989) Site-directed mutagenesis of lysine 58 in a putative ATP-binding domain of the calmodulin-sensitive adenylate cyclase from Bordetella pertussis abolishes catalytic activity. Biochemistry 28:2772-6
Masure, H R; Storm, D R (1989) Characterization of the bacterial cell associated calmodulin-sensitive adenylate cyclase from Bordetella pertussis. Biochemistry 28:438-42

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