With the observation that tyrosine-protein kinases are commonly involved in cell growth control, significant effort has been devoted to understanding the identities, distributions and biochemical actions of these kinases. Such research has recently yielded the curious observation that elevated levels of tyrosine kinase activity are not only associated with rapidly growing and transformed cells, but in some cases also with quiescent, terminally differentiated cells. Since information on the roles of tyrosine kinases in nondividing cells might also provide insight into one or more aspects of their activities in transformed cells, we have undertaken an investigation of the regulation of the tyrosine kinase of erythrocytes and its influence on the properties of the major substrate band 3, especially on its ability to bind and regulate glycolytic enzymes. We intend to purify the above kinase and determine which endogenous/exogenous ligands modulate its activity. We also plan to determine whether activation/inhibition of the kinase in vivo regulates erythrocyte metabolism, as suggested from recent in vitro kinase in vivo regulates erythrocyte metabolism, as suggested from recent in vitro studies. Finally, because glycolytic rates and tyrosine kinase activity are often elevated in transformed cells, we plan to investigate the tyrosine phosphorylation of glycolytic enzyme binding proteins in nonerythroid cells in an attempt to understand the role they may play in the regulation of cell metabolism.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM040983-04
Application #
3298952
Study Section
Biochemistry Study Section (BIO)
Project Start
1988-12-01
Project End
1993-11-30
Budget Start
1991-12-01
Budget End
1992-11-30
Support Year
4
Fiscal Year
1992
Total Cost
Indirect Cost
Name
Purdue University
Department
Type
Schools of Arts and Sciences
DUNS #
072051394
City
West Lafayette
State
IN
Country
United States
Zip Code
47907
Harrison, M L; Isaacson, C C; Burg, D L et al. (1994) Phosphorylation of human erythrocyte band 3 by endogenous p72syk. J Biol Chem 269:955-9
Low, P S; Rathinavelu, P; Harrison, M L (1993) Regulation of glycolysis via reversible enzyme binding to the membrane protein, band 3. J Biol Chem 268:14627-31
Wang, C C; Badylak, J A; Lux, S E et al. (1992) Expression, purification, and characterization of the functional dimeric cytoplasmic domain of human erythrocyte band 3 in Escherichia coli. Protein Sci 1:1206-14
Harrison, M L; Rathinavelu, P; Arese, P et al. (1991) Role of band 3 tyrosine phosphorylation in the regulation of erythrocyte glycolysis. J Biol Chem 266:4106-11
Low, P S; Geahlen, R L; Mehler, E et al. (1990) Extracellular control of erythrocyte metabolism mediated by a cytoplasmic tyrosine kinase. Biomed Biochim Acta 49:S135-40
Willardson, B M; Thevenin, B J; Harrison, M L et al. (1989) Localization of the ankyrin-binding site on erythrocyte membrane protein, band 3. J Biol Chem 264:15893-9