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. 1995 May 1;14(9):1979–1990. doi: 10.1002/j.1460-2075.1995.tb07190.x

Functional analysis of mutant neurotrophins deficient in low-affinity binding reveals a role for p75LNGFR in NT-4 signalling.

M Rydén 1, J Murray-Rust 1, D Glass 1, L L Ilag 1, M Trupp 1, G D Yancopoulos 1, N Q McDonald 1, C F Ibáñez 1
PMCID: PMC398297  PMID: 7744005

Abstract

The neurotrophins mediate their effects through binding to two classes of receptors, a tyrosine kinase receptor, member of the Trk family, and the low-affinity neurotrophin receptor, p75LNGFR, of as yet undefined signalling capacity. The need for a two-component receptor system in neurotrophin signalling is still not understood. Using site-directed mutagenesis, we have identified positively charged surfaces in BDNF, NT-3 and NT-4 that mediate binding to p75LNGFR. Arg31 and His33 in NT-3, and Arg34 and Arg36 in NT-4, located in an exposed hairpin loop, were found to be essential for binding to p75LNGFR. In BDNF, however, positively charged residues critical for p75LNGFR binding (Lys95, Lys96 and Arg97) were found in a spatially close but distinct loop region. Models of each neurotrophin were built using the coordinates of NGF. Analysis of their respective electrostatic surface potentials revealed similar clusters of positively charged residues in each neurotrophin but with differences in their precise spatial locations. Disruption of this positively charged interface abolished binding to p75LNGFR but not activation of cognate Trk receptors or biological activity in Trk-expressing fibroblasts. Unexpectedly, loss of low-affinity binding in NT-4, but not in BDNF or NT-3, affected receptor activation and biological activity in neuronal cells co-expressing p75LNGFR and TrkB, suggesting a role for p75LNGFR in regulating biological responsiveness to NT-4. These findings reveal a possible mechanism of ligand discrimination by p75LNGFR and suggest this receptor may selectively modulate the biological actions of specific neurotrophin family members.

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Selected References

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