Journal
FEBS LETTERS
Volume 580, Issue 8, Pages 2059-2064Publisher
WILEY
DOI: 10.1016/j.febslet.2006.03.008
Keywords
dictyostelium; chemotaxis; cGMP; myosin; regulatory light chain; phosphorylation
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Stimulation of Dictyostelium cells with the chemoattractant cAMP results in transient phosphorylation of the myosin regulatory light chain (RLC). We show that myosin light chain kinase A (MLCK-A) is responsible for RLC phosphorylation during chemotaxis, and that MLCK-A itself is transiently phosphorylated on threonine-166, dramatically increasing its catalytic activity. MLCK-A activation during chemotaxis is highly responsive to cellular cGMP levels and the cGMP-binding protein GbpC. MLCK-A(-) cells have a partial cytokinesis defect, and do not phosphorylate RLC in response to concanavalin A (conA), but cells lacking cGMP or GbpC divide normally and phosphorylate in response to conA. Thus MLCK-A is activated by a cGMP/GbpC-independent mechanism activated during cytokinesis or by conA, and a cGMP/GbpC-dependent pathway during chemotaxis. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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