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Mapping of the laminin-binding site of the N-terminal agrin domain (NtA)

Mascarenhas, J. B. and Ruegg, M. A. and Winzen, U. and Halfter, W. and Engel, J. and Stetefeld, J.. (2003) Mapping of the laminin-binding site of the N-terminal agrin domain (NtA). The EMBO Journal, 22 (3). pp. 529-536.

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Official URL: http://edoc.unibas.ch/dok/A5258400

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Abstract

Agrin is a key organizer of acetylcholine receptor (AChR) clustering at the neuromuscular junction. The binding of agrin to laminin is required for its localization to synaptic basal lamina and other basement membranes. The high-affinity interaction with the coiled-coil domain of laminin is mediated by the N-terminal domain of agrin. We have adopted a structurally guided site-directed mutagenesis approach to map the laminin-binding site of NtA. Mutations of L117 and V124 in the C-terminal helix 3 showed that they are crucial for binding. Both residues are located in helix 3 and face the groove between the beta-barrel and the C-terminal helical segment of NtA. Remarkably, the distance between both residues matches a heptad repeat distance of two aliphatic residues which are solvent exposed in the coiled-coil domain of laminin. A lower but significant contribution originates from R43 and a charged cluster (E23, E24 and R40) at the open face of the beta-barrel structure. We propose that surface-exposed, conserved residues of the laminin gamma1 chain interact with NtA via hydrophobic and ionic interactions.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Neurobiology > Pharmacology/Neurobiology (Rüegg)
UniBasel Contributors:Rüegg, Markus A.
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Nature Publishing Group
ISSN:0261-4189
e-ISSN:1460-2075
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Apr 2019 15:11
Deposited On:22 Mar 2012 13:20

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