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1: Nature. 1995 Aug 10;376(6540):509-14.
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Collapsin-induced growth cone collapse mediated by an intracellular protein related to UNC-33.

Goshima Y, Nakamura F, Strittmatter P, Strittmatter SM.

Department of Neurology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.

Collapsin, a member of the newly recognized semaphorin family, contributes to axonal pathfinding during neural development by inhibiting growth cone extension. The mechanism of collapsin action is poorly understood. Here we use a Xenopus laevis oocyte expression system to identify molecules involved in collapsin signalling, because several experiments have raised the possibility that heterotrimeric GTP-binding proteins might participate in these events. A collapsin response mediator protein of relative molecular mass (M(r)) 62K (CRMP-62) required for collapsin-induced inward currents in X. laevis oocytes is isolated. CRMP-62 shares homology with UNC-33, a nematode neuronal protein required for appropriately directed axonal extension. CRMP-62 is localized exclusively in the developing chick nervous system. Introduction of anti-CRMP-62 antibodies into dorsal root ganglion neurons blocks collapsin-induced growth cone collapse. CRMP-62 appears to be an intracellular component of a signalling cascade initiated by an unidentified transmembrane collapsin-binding protein.

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PMID: 7637782 [PubMed - indexed for MEDLINE]