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Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

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Structural basis of Dscam isoform specificity.

Rob Meijers¹, Roland Puettmann-Holgado, Georgios Skiniotis

¹Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

|August 28, 2007

Summary

This summary is machine-generated.

The Down syndrome cell adhesion molecule (Dscam) gene generates diverse receptors for neuronal wiring. Variable regions in Dscam isoforms dictate homophilic binding specificity through specific peptide interactions.

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Area of Science:

Molecular Biology
Neuroscience
Immunology

Background:

The Down syndrome cell adhesion molecule (Dscam) gene produces numerous cell surface receptors.
These receptors are crucial for neuronal wiring and immune responses, offering recognition specificity.
Alternative splicing of Dscam generates sequence variability in immunoglobulin ecto-domains (D2, D3, D7).

Purpose of the Study:

To elucidate the structural basis of Dscam isoform recognition.
To investigate the role of variable domains in homophilic binding specificity.

Main Methods:

X-ray crystallography to determine the structures of Dscam isoforms (D1-D4).
Structure-guided mutagenesis and peptide segment swapping experiments.
Phylogenetic analysis of Dscam sequences.

Main Results:

Two distinct Dscam isoforms adopt a horseshoe configuration.
Variable residues in D2 and D3 form two independent surface epitopes (I and II).
Dscam isoforms homo-dimerize via specific interactions involving epitope I, with variable peptide segments conferring specificity.

Conclusions:

Epitope I, characterized by complementary variable residues, is essential for Dscam homophilic binding specificity.
Phylogenetic analysis supports strong selection for matching peptide sequences in epitope I.
Dscam's homophilic binding specificity is driven by peptide complementarity within epitope I.