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First published online 21 July 2004
doi: 10.1242/dev.01274

Development 131, 3981-3989 (2004)
Published by The Company of Biologists 2004
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Sra-1 interacts with Kette and Wasp and is required for neuronal and bristle development in Drosophila

Sven Bogdan, Oliver Grewe, Mareike Strunk, Alexandra Mertens and Christian Klämbt*

Institut für Neurobiologie, Universität Münster, Badestrasse 9, Münster, 48149, Germany

* Author for correspondence (e-mail: klaembt{at}uni-muenster.de)

Accepted 17 May 2004

Regulation of growth cone and cell motility involves the coordinated control of F-actin dynamics. An important regulator of F-actin formation is the Arp2/3 complex, which in turn is activated by Wasp and Wave. A complex comprising Kette/Nap1, Sra-1/Pir121/CYFIP, Abi and HSPC300 modulates the activity of Wave and Wasp. We present the characterization of Drosophila Sra-1 (specifically Rac1-associated protein 1). sra-1 and kette are spatially and temporally co-expressed, and both encoded proteins interact in vivo. During late embryonic and larval development, the Sra-1 protein is found in the neuropile. Outgrowing photoreceptor neurons express high levels of Sra-1 also in growth cones. Expression of double stranded sra-1 RNA in photoreceptor neurons leads to a stalling of axonal growth. Following knockdown of sra-1 function in motoneurons, we noted abnormal neuromuscular junctions similar to what we determined for hypomorphic kette mutations. Similar mutant phenotypes were induced after expression of membrane-bound Sra-1 that lacks the Kette-binding domain, suggesting that sra-1 function is mediated through kette. Furthermore, we could show that both proteins stabilize each other and directly control the regulation of the F-actin cytoskeleton in a Wasp-dependent manner.

Key words: F-actin, Drosophila, NAP1/Kette, Sra-1/CYFIP, Wasp


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