ZFIN ID: ZDB-PUB-150721-6
A Floor-Plate Extracellular Protein-Protein Interaction Screen Identifies Draxin as a Secreted Netrin-1 Antagonist
Gao, X., Metzger, U., Panza, P., Mahalwar, P., Alsheimer, S., Geiger, H., Maischein, H.M., Levesque, M.P., Templin, M., Söllner, C.
Date: 2015
Source: Cell Reports 12(4): 694-708 (Journal)
Registered Authors: Geiger, Horst, Levesque, Mitch, Maischein, Hans-Martin, Söllner, Christian
Keywords: none
MeSH Terms: Amino Acid Sequence; Animals; Binding Sites; Molecular Sequence Data; Nerve Growth Factors/metabolism* (all 12) expand
PubMed: 26190107 Full text @ Cell Rep.
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ABSTRACT
Floor-plate-derived extracellular signaling molecules, including canonical axon guidance cues of the Netrin family, control neuronal circuit organization. Despite the importance of the floor plate as an essential signaling center in the developing vertebrate central nervous system, no systematic approach to identify binding partners for floor-plate-expressed cell-surface and secreted proteins has been carried out. Here, we used a high-throughput assay to discover extracellular protein-protein interactions, which likely take place in the zebrafish floor-plate microenvironment. The assembled floor-plate network contains 47 interactions including the hitherto-not-reported interaction between Netrin-1 and Draxin. We further characterized this interaction, narrowed down the binding interface, and demonstrated that Draxin competes with Netrin receptors for binding to Netrin-1. Our results suggest that Draxin functions as an extracellular Netrin signaling modulator in vertebrates. A reciprocal gradient of Draxin might shape or sharpen the active Netrin gradient, thereby critically modulating its effect.
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