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Bacterial aspartate kinase-like activity in human platelet
G Arenas-Díaz1, L A Mercado, S H Marshall
1Laboratorios de Fisiología Celular, Universidad Católica de Valparaíso, Chile. garenas@aix1.ucv.cl
Cellular & Molecular Biology Research
|January 1, 1995
Summary
Aspartate kinase enzymes, found in bacteria and plants, may exist in human cells. Researchers detected aspartate kinase-like activity in human platelets using E. coli antibodies, observing phosphorylation of membrane proteins.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Aspartate kinases are crucial enzymes in amino acid biosynthesis.
- These enzymes are predominantly known in prokaryotes and plants.
- Their presence and function in animal cells remain largely uncharacterized.
Purpose of the Study:
- To investigate the potential existence of aspartate kinase-like activity in human cells.
- To characterize the nature of this activity in human platelets.
Main Methods:
- Immunodetection using antibodies against purified aspartate kinase from Escherichia coli.
- Analysis of protein phosphorylation in human platelet extracts.
- Enrichment of platelet extracts with bacterial aspartate kinase.
Main Results:
- Aspartate kinase-like activity was successfully immunodetected in human platelets.
- Enrichment with bacterial aspartate kinase induced phosphorylation of endogenous polypeptides.
- Phosphorylated polypeptides were predominantly membrane-bound.
Conclusions:
- Human platelets possess aspartate kinase-like enzymatic activity.
- This activity appears capable of phosphorylating endogenous membrane proteins.
- Further research is warranted to elucidate the specific role and identity of this enzyme in human cells.