Abstract:
:The mammalian protein kinase D family is involved in manifold cellular processes including cell migration and motility. Recently it was shown that human PKD1 and PKD2 phosphorylate and thereby inhibit Slingshot 1 Like (SSH1L), a phosphatase which is central to the regulation of actin cytoskeletal dynamics. We noted before that the overexpression of a constitutively active form of Drosophila PKD (PKD-SE) affects the fly retina and the resultant phenotypes suggest underlying defects in the actin cytoskeleton. Drosophila Slingshot, however, does not possess the phosphorylation site known to be targeted in SSH1L by human PKD1. Here we show that Drosophila PKD, despite this lack of conservation, nevertheless negatively regulates Slingshot. Overexpression of the active PKD-SE protein causes cellular defects that are similar to those of slingshot mutants. These include aberrant bristle morphology and positioning of photoreceptor nuclei. Interestingly, the observed nuclear mispositioning is due to a disturbance of the cytoskeleton rather than the epithelial organization. In accordance, overexpression of PKD-SE results in an accumulation of filamentous actin. This enrichment is modified by changes in slingshot gene doses, in line with an antagonistic relationship between PKD and slingshot. We conclude that similar to mammals, Drosophila PKD is a negative regulator of Ssh, with the premise of a different target phosphorylation site in Ssh.
journal_name
Hereditasjournal_title
Hereditasauthors
Nagel AC,Schmid J,Auer JS,Preiss A,Maier Ddoi
10.1111/j.1601-5223.2010.02200.xsubject
Has Abstractpub_date
2010-10-01 00:00:00pages
237-42issue
5eissn
0018-0661issn
1601-5223journal_volume
147pub_type
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