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Endothelium-derived nitric oxide (NO) activates the heterodimeric heme protein soluble guanylate cyclase (sGC) to form cGMP. In different disease states, sGC levels and activity are diminished possibly involving the sGC binding chaperone, heat shock protein 90 (hsp90). Here we show that prolonged hsp90 inhibition in different cell types reduces protein levels of both sGC subunits by about half, an...