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Protein-tyrosine phosphorylation in the Archaea
S C Smith1, P J Kennelly, M Potts
1Department of Biochemistry and Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.
Journal of Bacteriology
|April 1, 1997
Summary
Archaea, including Euryarchaeota and Crenarchaeota, possess proteins phosphorylated on tyrosine. This discovery challenges our understanding of tyrosine phosphorylation
Area of Science:
- Microbiology
- Biochemistry
- Evolutionary Biology
Background:
- Tyrosine phosphorylation is crucial for eukaryotic cell regulation.
- The presence of this modification in Archaea was previously unknown.
Purpose of the Study:
- To investigate the occurrence of tyrosine phosphorylation in archaeal organisms.
- To explore the evolutionary implications of tyrosine phosphorylation in early life forms.
Main Methods:
- Analysis of protein samples from Sulfolobus sulfataricus, Haloferax volcanii, and Methanosarcina thermophila.
- Identification of phosphorylated tyrosine residues using biochemical assays.
Main Results:
- Proteins from all three archaeal species (Sulfolobus sulfataricus, Haloferax volcanii, Methanosarcina thermophila) were found to be tyrosine phosphorylated.
- This indicates tyrosine phosphorylation is not exclusive to eukaryotes.
Conclusions:
- The findings suggest an ancient origin for tyrosine phosphorylation.
- This challenges the established view of tyrosine phosphorylation's evolutionary trajectory and its role in cellular signaling across domains of life.