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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Bidirectional pigment granule movements of melanophores are regulated by protein phosphorylation and dephosphorylation.

Studies were conducted to investigate the molecular basis for bidirectional pigment granule transport in digitonin-lysed melanophores. Pigment granule dispersion, but not aggregation, required cAMP and resulted in the phosphorylation of a 57 kd polypeptide. cAMP-dependent protein kinase inhibitor prevented this phosphorylation as well as pigment dispersal. In contrast, both pigment aggregation and the concomitant dephosphorylation of the 57 kd polypeptide were blocked by phosphatase inhibitors. These data support a model in which pigment dispersion and aggregation require protein phosphorylation and dephosphorylation, respectively. Furthermore, studies using the ATP analog, ATP gamma S, suggest either that protein phosphorylation alone is sufficient for dispersion or that transport is mediated by a unique force-generating ATPase that can use ATP gamma S for hydrolyzable energy.[1]


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