Intracellular targets for a phosphotyrosine peptidomimetic include the mitotic kinesin, MCAK

SH2 domains are attractive targets for chemotherapeutic agents due to their involvement in the formation of protein-protein interactions critical to many signal transduction cascades. Little is known, however, about how synthetic SH2 domain ligands would influence the growth properties of tumor cell...

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Bibliographic Details
Published in:Biochemical pharmacology 2013-09, Vol.86 (5), p.597-611
Main Authors: Huang, Rong, Oh, Hyunju, Arrendale, Allison, Martin, Victoria A., Galan, Jacob, Workman, Eric J., Stout, Jane R., Walczak, Claire E., Tao, W. Andy, Borch, Richard F., Geahlen, Robert L.
Format: Article
Language:English
Subjects:
adenosinetriphosphatase
Cell Cycle
Cell Line, Tumor
chromosomes
Drug delivery
drugs
endopolyploidy
Humans
Kinesin
Kinesin - metabolism
leukemia
Ligands
lymphoma
MCAK
mitotic spindle apparatus
Peptidomimetic
Peptidomimetics - metabolism
Phosphorylation
Phosphotyrosine - metabolism
Protein Binding
protein-protein interactions
proteomics
SH2 domain
Signal transduction
Spectrometry, Mass, Electrospray Ionization
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Summary:SH2 domains are attractive targets for chemotherapeutic agents due to their involvement in the formation of protein-protein interactions critical to many signal transduction cascades. Little is known, however, about how synthetic SH2 domain ligands would influence the growth properties of tumor cells or with which intracellular proteins they would interact due to their highly charged nature and enzymatic lability. In this study, a prodrug delivery strategy was used to introduce an enzymatically stable, phosphotyrosine peptidomimetic into tumor cells. When tested in a human tumor cell panel, the prodrug exhibited a preference for inhibiting the growth of leukemia and lymphoma cells. In these cells, it was largely cytostatic and induced endoreduplication and the appearance of midbodies. Proteomic analyses identified multiple targets that included mitotic centromere-associated kinesin (MCAK). Molecular modeling studies suggested the ATP-binding site on MCAK as the likely site of drug interaction. Consistent with this, ATP inhibited the drug-MCAK interaction and the drug inhibited MCAK ATPase activity. Accordingly, the effects of the prodrug on the assembly of the mitotic spindle and alignment of chromosomes were consistent with the identification of MCAK as an important intracellular target.
ISSN:0006-2952
1873-2968
DOI:10.1016/j.bcp.2013.06.024