Abstract
Casein kinase-1 is a family of ubiquitous eukaryotic protein kinases that frequently function in tandem with the ubiquitin modification system to modulate protein turnover and trafficking. In Alzheimer's disease, these enzymes colocalize with ubiquitinated lesions, including neurofibrillary tangles and granulovacuolar degeneration bodies, suggesting they also play a role in disease pathogenesis. To identify binding partners that potentially regulate or recruit these enzymes toward disease lesions, a Sos-recruitment yeast two-hybrid screen was performed with human Ckidelta (the casein kinase-1 isoform most closely linked to granulovacuolar degeneration bodies) and a human brain cDNA library. All interacting clones contained a single open reading frame termed casein kinase-1 binding protein (CK1BP). On the basis of sequence alignments, CK1BP was a structural homologue of the acidic domain of dysbindin, a component of the dystrophin-associated protein complex and the biogenesis of lysosome-related organelles complex-1. CK1BP interacted with full-length Ckidelta, the isolated Ckidelta catalytic domain, Ckigamma2, -gamma3, and -epsilon in the yeast two-hybrid system, and bound Ckidelta and -epsilon in pulldown assays but did not int...Continue Reading
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