Understanding DUSP5 and Its Role in Dephosphorylating ERK
Author Information
Author(s): Imhoff Andrea, Sweeney Noreena L., Bongard Robert D., Syrlybaeva Raulia, Gupta Ankan, Del Carpio Edgar, Talipov Marat R., Garcia-Keller Costanza, Crans Debbie C., Ramchandran Ramani, Sem Daniel S.
Primary Institution: Center for Structure-based Drug Design and Development, Department of Pharmaceutical Sciences, Concordia University Wisconsin
Hypothesis
The two phosphate binding sites will be occupied by the phosphate groups (pT185 & pY187) of ERK2.
Conclusion
DUSP5 shows a preference for dephosphorylating the phospho-tyrosine before the phospho-threonine in the ERK activation loop.
Supporting Evidence
- DUSP5 can dephosphorylate both phospho-threonine and phospho-tyrosine residues.
- Studies indicate that DUSP5 has a dynamic active site that accommodates multiple peptide orientations.
- Competitive inhibition studies show that the diphosphorylated peptide is a better substrate than the monophosphorylated peptides.
Takeaway
DUSP5 is a protein that helps control other proteins by removing phosphate groups, and it prefers to remove one type of phosphate before another.
Methodology
The study involved NMR spectroscopy and steady-state kinetic analysis to characterize the interactions between DUSP5 and the phosphorylated ERK2 activation loop.
Digital Object Identifier (DOI)
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