Differing substrate specificities of members of the DYRK family of arginine-directed protein kinases
Campbell, Linda E. and Proud, Christopher G. (2002) Differing substrate specificities of members of the DYRK family of arginine-directed protein kinases. FEBS Letters, 510, (1-2), 31-36. (doi:10.1016/S0014-5793(01)03221-5).
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The mammalian DYRK (dual specificity tyrosine phosphorylated and regulated kinase) family of protein kinases comprises a number of related, but poorly understood enzymes. DYRK1A is nuclear while DYRKs 2 and 3 are cytoplasmic. We recently showed that DYRK2 phosphorylates the translation initiation factor eIF2B at Ser539 in its ε-subunit and thereby ‘primes’ its phosphorylation by glycogen synthase kinase-3. Here we have used peptides based on the sequence around Ser539 to help define the specificity of DYRK2/3 in comparison with DYRK1A. These kinases require an arginine N-terminal to the target residue for efficient substrate phosphorylation. This cannot be replaced even by lysine. A peptide with arginine at −2 is phosphorylated much less well by all three kinases than one with arginine at −3. Replacement of the +1 proline by alanine almost completely eliminates substrate phosphorylation, but valine here does allow phosphorylation especially by DYRK2. This study reveals both similarities and differences in the specificities of these arginine-dependent protein kinases.
|Keywords:||protein kinase, DYRK, proline, minbrain, initiation factor, eIF|
|Subjects:||Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
|Divisions:||University Structure - Pre August 2011 > School of Biological Sciences
|Date Deposited:||07 Aug 2008|
|Last Modified:||12 Jul 2013 01:07|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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