The nonmuscle myosin phosphatase PP1beta (flapwing) negatively regulates Jun N-terminal kinase in wing imaginal discs of Drosophila.
Drosophila flapwing (flw) codes for serine/threonine protein phosphatase type 1beta (PP1beta). Regulation of nonmuscle myosin activity is the single essential flw function that is nonredundant with the three closely related PP1alpha genes. Flw is thought to dephosphorylate the nonmuscle myosin regulatory light chain, Spaghetti Squash (Sqh); this inactivates the nonmuscle myosin heavy chain, Zipper (Zip). Thus, strong flw mutants lead to hyperphosphorylation of Sqh and hyperactivation of nonmuscle myosin activity. Here, we show genetically that a Jun N-terminal kinase (JNK) mutant suppresses the semilethality of a strong flw allele. Alleles of the JNK phosphatase puckered (puc) genetically enhance the weak allele flw1, leading to severe wing defects. Introducing a mutant of the nonmuscle myosin-binding subunit (Mbs) further enhances this genetic interaction to lethality. We show that puc expression is upregulated in wing imaginal discs mutant for flw1 and pucA251 and that this upregulation is modified by JNK and Zip. The level of phosphorylated (active) JNK is elevated in flw1 enhanced by puc. Together, we show that disruption of nonmuscle myosin activates JNK and puc expression in wing imaginal discs.
Kirchner
Jasmin
J
Department of Zoology, University of Oxford, Oxford OX1 3PS, United Kingdom.
Gross
Sascha
S
Bennett
Daimark
D
Alphey
Luke
L
D000818:Animals; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism; D004331:Drosophila melanogaster / Q000201:enzymology* / Q000235:genetics* / Q000254:growth & development; D004742:Enhancer Elements, Genetic; D005260:Female; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D017344:Genes, Insect; D048031:JNK Mitogen-Activated Protein Kinases / Q000235:genetics* / Q000378:metabolism; D008297:Male; D009154:Mutation; D024462:Myosin Type II / Q000235:genetics / Q000378:metabolism; D043263:Myosin-Light-Chain Phosphatase / Q000235:genetics* / Q000378:metabolism; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism; D010766:Phosphorylation; D014921:Wings, Animal / Q000201:enzymology / Q000254:growth & development
D029721:Drosophila Proteins; C495593:Sqh protein, Drosophila; D048031:JNK Mitogen-Activated Protein Kinases; C110854:puc protein, Drosophila; D010749:Phosphoprotein Phosphatases; D043263:Myosin-Light-Chain Phosphatase; D024462:Myosin Type II