Bisubstrate inhibitor approach for targeting mitotic kinase Haspin

Bioconjug Chem. 2015 Feb 18;26(2):225-34. doi: 10.1021/bc500464r. Epub 2015 Jan 29.

Abstract

During the past decade, the basophilic atypical kinase Haspin has emerged as a key player in mitosis responsible for phosphorylation of Thr3 residue of histone H3. Here, we report the construction of conjugates comprising an aromatic fragment targeted to the ATP-site of Haspin and a peptide mimicking the N-terminus of histone H3. The combination of effective solid phase synthesis procedures and a high throughput binding/displacement assay with fluorescence anisotropy readout afforded the development of inhibitors with remarkable subnanomolar affinity toward Haspin. The selectivity profiles of novel conjugates were established by affinity studies with a model basophilic kinase (catalytic subunit of cAMP-dependent protein kinase) and by a commercial 1-point inhibition assay with 43 protein kinases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Amino Acid Sequence
  • Binding Sites
  • Histones / chemistry
  • Humans
  • Intracellular Signaling Peptides and Proteins / antagonists & inhibitors*
  • Intracellular Signaling Peptides and Proteins / chemistry
  • Intracellular Signaling Peptides and Proteins / metabolism
  • Mitosis
  • Models, Molecular
  • Peptides / chemistry*
  • Peptides / pharmacology*
  • Protein Kinase Inhibitors / chemistry*
  • Protein Kinase Inhibitors / pharmacology*
  • Protein-Serine-Threonine Kinases / antagonists & inhibitors*
  • Protein-Serine-Threonine Kinases / chemistry
  • Protein-Serine-Threonine Kinases / metabolism
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism

Substances

  • Histones
  • Intracellular Signaling Peptides and Proteins
  • Peptides
  • Protein Kinase Inhibitors
  • Recombinant Proteins
  • Adenosine Triphosphate
  • HASPIN protein, human
  • Protein-Serine-Threonine Kinases