Nov 5, 2018

A new family of neural wiring receptors across bilaterians defined by phylogenetic, biochemical and structural evidence

BioRxiv : the Preprint Server for Biology
Shouqiang ChengEngin Özkan

Abstract

The evolution of complex nervous systems was accompanied by the expansion of groups of protein families, most notably cell adhesion molecules, surface receptors and their ligands. These proteins mediate axonal guidance, synapse targeting, and other neuronal wiring-related functions. Recently, members of a set of thirty interacting cell surface proteins belonging to two newly defined families of the immunoglobulin superfamily (IgSF) in fruit flies were discovered to label different subsets of neurons in the brain and ventral nerve cord. They have been shown to be involved in synaptic targeting and morphogenesis, retrograde signaling, and neuronal survival. Here we show that these proteins, denoted as Dprs and DIPs, belong to a family of two and three-Ig domain molecules in bilaterians generally known for neuronal wiring functions. In protostomes, the ancestral Dpr/DIP gene has duplicated to form heterophilic partners, such as Dprs and DIPs, while in deuterostomes, they have evolved to create the IgLON family of neuronal receptors. In support of this phylogeny, we show that IgLONs interact with each other, and that their complexes can be broken by mutations designed using homology models based on Dpr and DIP structures. Similarly...Continue Reading

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Mentioned in this Paper

DACT1
Dpr protein, Streptococcus
Immunoglobulin Activity
Desquamative Interstitial Pneumonia
Immunoglobulin Domain
Caenorhabditis elegans
Complex (molecular entity)
Neurons
Brain
IGSF11 protein, human

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