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Mammalian protein histidine kinases
Paul G Besant1, Eiling Tan, Paul V Attwood
1Proteomics International Pty Ltd, Level 21, Governor Stirling Tower, 197 St. Georges Terrace, Perth, WA 6000, Australia.
The International Journal of Biochemistry & Cell Biology
|January 18, 2003
Summary
Mammalian histidine kinases, enzymes that phosphorylate proteins on histidine residues, are poorly understood. This review proposes their general role in cellular signaling, highlighting potential therapeutic targets.
Area of Science:
- Biochemistry
- Cellular Biology
- Molecular Signaling
Background:
- Histidine kinases are well-documented in bacteria and lower eukaryotes, playing key roles in cellular signaling.
- Their presence and function in mammalian cells remain largely uncharacterized.
- Protein phosphorylation is crucial for regulating nearly all cellular functions.
Purpose of the Study:
- To review current knowledge on mammalian histidine kinases.
- To propose a general role for these enzymes in mammalian cells based on phosphohistidine chemistry and known functions in other organisms.
Main Methods:
- Literature review of existing studies on histidine kinases.
- Analysis of phosphohistidine chemistry.
- Comparative analysis of histidine kinase mechanisms in bacteria, yeast, plants, and mammals.
Main Results:
- Histidine kinases phosphorylate substrates on histidine residues.
- The high energy of phosphohistidine facilitates phosphate transfer for signaling.
- Mammalian histidine kinases are proposed to function analogously to those in other eukaryotes.
Conclusions:
- Mammalian histidine kinases are likely involved in cellular signaling pathways.
- Understanding histidine phosphorylation in mammals could reveal new therapeutic targets.
- Further investigation into mammalian histidine kinases is warranted for a comprehensive understanding of cellular regulation.