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Published online 18 September 2000. doi:10.1083/jcb.150.6.1361
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© The Rockefeller University Press, 0021-9525/2000//1361 $5.00
The Journal of Cell Biology, Volume 150, Number 6, , 2000 1361-1374

Original Article

Drosophila Atypical Protein Kinase C Associates with Bazooka and Controls Polarity of Epithelia and Neuroblasts



Andreas Wodarza, Andreas Ramratha, Alexandra Grimma, and Elisabeth Knusta

a Institut für Genetik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
Institut für Genetik, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.+49-211-8112279+49-211-8114743

The establishment and maintenance of polarity is of fundamental importance for the function of epithelial and neuronal cells. In Drosophila, the multi-PDZ domain protein Bazooka (Baz) is required for establishment of apico-basal polarity in epithelia and in neuroblasts, the stem cells of the central nervous system. In the latter, Baz anchors Inscuteable in the apical cytocortex, which is essential for asymmetric localization of cell fate determinants and for proper orientation of the mitotic spindle. Here we show that Baz directly binds to the Drosophila atypical isoform of protein kinase C and that both proteins are mutually dependent on each other for correct apical localization. Loss-of-function mutants of the Drosophila atypical isoform of PKC show loss of apico-basal polarity, multilayering of epithelia, mislocalization of Inscuteable and abnormal spindle orientation in neuroblasts. Together, these data provide strong evidence for the existence of an evolutionary conserved mechanism that controls apico-basal polarity in epithelia and neuronal stem cells. This study is the first functional analysis of an atypical protein kinase C isoform using a loss-of-function allele in a genetically tractable organism.

Key Words: cell polarity • atypical PKC • Bazooka • tight junction • asymmetric cell division

© 2000 The Rockefeller University Press

Abbreviations used in this paper: Arm, Armadillo; Baz, Bazooka; CNS, central nervous system; Crb, Crumbs; DaPKC, Drosophila atypical PKC; Insc, Inscuteable; Nrt, Neurotactin; sdt, stardust; TJ, tight junction; ZA, zonula adherens.


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