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Structural relationship between a bacterial developmental protein and eukaryotic PP2C protein phosphatases
E Adler1, A Donella-Deana, F Arigoni
1Institut de Biologie Physico-Chimique, Paris, France.
Molecular Microbiology
|January 1, 1997
Summary
Bacillus subtilis SpoIIE, a Ser protein phosphatase, activates sporulation by dephosphorylating SpoIIAA. This phosphatase shares structural and functional similarities with eukaryotic PP2C phosphatases, suggesting conserved regulatory mechanisms.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Bacillus subtilis SpoIIE is a key Ser protein phosphatase regulating bacterial sporulation.
- Its target, SpoIIAA, is a phosphoprotein that controls transcription factors essential for cell differentiation.
Purpose of the Study:
- To investigate the structural and functional relationship between Bacillus subtilis SpoIIE and eukaryotic protein phosphatases.
- To elucidate the evolutionary conservation of regulatory mechanisms involving protein kinases and phosphatases.
Main Methods:
- Sequence similarity analysis comparing SpoIIE to the PP2C family of eukaryotic Ser/Thr protein phosphatases.
- Functional analysis of conserved residues in SpoIIE and the yeast PP2C protein TPD1.
Main Results:
- SpoIIE exhibits significant sequence similarity to the PP2C family of protein phosphatases.
- Conserved residues are crucial for the function of both SpoIIE and the yeast PP2C, TPD1.
- A formal similarity was identified between the SpoIIAA regulatory circuit and the mammalian mitochondrial pyruvate dehydrogenase regulation.
Conclusions:
- SpoIIE and eukaryotic PP2C protein phosphatases are structurally related.
- A conserved mechanism of biological regulation involving His protein kinase-like Ser kinases and PP2C-like protein phosphatases may exist across evolutionarily distant organisms.