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. 1996 Sep 16;15(18):4835–4843.

The structure-function relationships in Drosophila neurotactin show that cholinesterasic domains may have adhesive properties.

I Darboux 1, Y Barthalay 1, M Piovant 1, R Hipeau-Jacquotte 1
PMCID: PMC452221  PMID: 8890157

Abstract

Neurotactin (Nrt), a Drosophila transmembrane glycoprotein which is expressed in neuronal and epithelial tissues during embryonic and larval stages, exhibits heterophilic adhesive properties. The extracellular domain is composed of a catalytically inactive cholinesterase-like domain. A three-dimensional model deduced from the crystal structure of Torpedo acetylcholinesterase (AChE) has been constructed for Nrt and suggests that its extracellular domain is composed of two sub-domains organized around a gorge: an N-terminal region, whose three-dimensional structure is almost identical to that of Torpedo AChE, and a less conserved C-terminal region. By using truncated Nrt molecules and a homotypic cell aggregation assay which involves a soluble ligand activity, it has been possible to show that the adhesive function is localized in the N-terminal region of the extracellular domain comprised between His347 and His482. The C-terminal region of the protein can be removed without impairing Nrt adhesive properties, suggesting that the two sub-domains are structurally independent. Chimeric molecules in which the Nrt cholinesterase-like domain has been replaced by homologous domains from Drosophila AChE, Torpedo AChE or Drosophila glutactin (Glt), share similar adhesive properties. These properties may require the presence of Nrt cytoplasmic and transmembrane domains since authentic Drosophila AChE does not behave as an adhesive molecule when transfected in S2 cells.

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