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General Stability
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2.7.1.67
molecular chaperone Hsp90 is a binding partner of isozyme PI4KIIbeta. Geldanamycin, a specific Hsp90 inhibitor, disrupts the Hsp90-PI4KIIbeta interaction and destabilizes PI4KIIbeta, reducing its half-life by 40% and increasing its susceptibility to ubiquitylation and proteasomal degradation. Cytosolic PI4KIIbeta is much more sensitive to geldanamycin treatment than is the integrally membrane-associated species. Stimuli such as PDGF receptor activation that also induce recruitment of the kinase to membranes disrupt the Hsp90-PI4KIIbeta interaction to a similar extent as inhibitor treatment
722700
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