Various aspects of protein degradation will be studied using red cell-mediated microinjection of proteins into cultured mammalian cells. We will determine whether dissimilar subunits of proteins turn over at identical rates and whether covalent-binding of substrate analogs to enzymes retards their degradation. We will attempt to detect initial reactions in protein degradation by coinjection of protease inhibitors and labeled proteins or by exposing injected cells to low temperature. To determine whether lysosomes are involved in the degradation of soluble proteins we will couple nondegradable D-amino acid peptides to proteins prior to injection. Non-degraded peptides are expected to accumulate within the lysosomes if degradation of protein occurs there. We also propose to isolate mutant HeLa cells that degrade immunoglobin G at reduced rates.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM027159-10
Application #
3274572
Study Section
Molecular Cytology Study Section (CTY)
Project Start
1980-01-01
Project End
1989-12-31
Budget Start
1989-01-01
Budget End
1989-12-31
Support Year
10
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Utah
Department
Type
Schools of Arts and Sciences
DUNS #
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112
Inoue, I; Rechsteiner, M (1994) On the relationship between the metabolic and thermodynamic stabilities of T4 lysozymes. Measurements in eukaryotic cells. J Biol Chem 269:29247-51
Inoue, I; Rechsteiner, M (1994) On the relationship between the metabolic and thermodynamic stabilities of T4 lysozymes. Measurements in Escherichia coli. J Biol Chem 269:29241-6
Mahaffey, D; Yoo, Y; Rechsteiner, M (1993) Ubiquitin metabolism in cycling Xenopus egg extracts. J Biol Chem 268:21205-11
Deveraux, Q; Wells, R; Rechsteiner, M (1990) Ubiquitin metabolism in ts85 cells, a mouse carcinoma line that contains a thermolabile ubiquitin activating enzyme. J Biol Chem 265:6323-9
Rote, K V; Hough, R; Goldenberg, D et al. (1989) Circular pancreatic trypsin inhibitor. A novel substrate for studies on intracellular proteolysis. J Biol Chem 264:1156-62
Pratt, G; Hough, R; Rechsteiner, M (1989) Proteolysis in heat-stressed HeLa cells. Stabilization of ubiquitin correlates with the loss of proline endopeptidase. J Biol Chem 264:12526-32
Rote, K; Rogers, S; Pratt, G et al. (1989) Degradation of structurally characterized proteins injected into HeLa cells. Comparison with their stability in rabbit reticulocyte lysate. J Biol Chem 264:9772-9
Rogers, S W; Rechsteiner, M (1988) Degradation of structurally characterized proteins injected into HeLa cells. Effects of intracellular location and the involvement of lysosomes. J Biol Chem 263:19843-9
Rogers, S W; Rechsteiner, M (1988) Degradation of structurally characterized proteins injected into HeLa cells. Tests of hypotheses. J Biol Chem 263:19850-62
Redman, K L; Rechsteiner, M (1988) Extended reading frame of a ubiquitin gene encodes a stable, conserved, basic protein. J Biol Chem 263:4926-31

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