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Regulator-driven functional diversification of protein phosphatase-1 in eukaryotic evolution
Hugo Ceulemans1, Willy Stalmans, Mathieu Bollen
1Afdeling Biochemie, Katholieke Universiteit Leuven, Belgium. Hugo.Ceulemans@med.kuleuven.ac.be
Summary
This study reveals that protein phosphatase 1 (PP1) regulators evolved with eukaryotes, with key families emerging early. Gene duplication and protein conversion drove the expansion of PP1 regulatory networks, especially in vertebrates.
Area of Science:
- Evolutionary biology
- Molecular biology
- Genomics
Background:
- Protein phosphatases, particularly protein phosphatase 1 (PP1), play crucial roles in cellular regulation.
- The functional diversity of PP1 is modulated by a wide array of regulatory subunits.
- Understanding the evolutionary history of these regulators is key to deciphering cellular control mechanisms.
Purpose of the Study:
- To trace the evolutionary trajectory of thirteen established vertebrate regulator families of protein phosphatase 1 (PP1).
- To identify candidate primordial PP1 regulators present in early eukaryotic lineages.
- To investigate the expansion and diversification of PP1 regulatory networks throughout eukaryotic evolution.
Main Methods:
- Comparative genomics analysis of (nearly) completed eukaryotic genome sequences.
- Phylogenetic analysis to identify conserved and novel regulator families.
- Identification of gene duplication events and protein recruitment as mechanisms for expansion.
Main Results:
- Two PP1 regulator families were identified as present in all crown eukaryotic lineages, suggesting they are primordial.
- The repertoire of PP1 regulators expanded significantly over evolutionary time, correlating with functional innovations.
- The emergence of metazoan multicellularity spurred an explosive increase in PP1 regulator diversity.
- Gene duplication and the repurposing of existing proteins were major drivers of PP1 functional diversification in vertebrates.
- Nine previously uncharacterized proteins were identified as putative PP1 regulators.
Conclusions:
- The evolution of PP1 regulatory networks is deeply intertwined with major events in eukaryotic evolution, including the origin of eukaryotes and multicellularity.
- Primordial PP1 regulators laid the foundation for complex regulatory systems, which were subsequently elaborated through gene duplication and protein recruitment.
- This study expands the known landscape of PP1 regulators, offering new avenues for research into cellular signaling and disease.