Download MendeleyExon Inclusion Modulates Conformational Plasticity and Autoinhibition of the Intersectin 1 SH3A Domain.
Gerth, F., Japel, M., Sticht, J., Kuropka, B., Schmitt, X.J., Driller, J.H., Loll, B., Wahl, M.C., Pagel, K., Haucke, V., Freund, C.(2019) Structure 27: 977
- PubMed: 31031201
- DOI: https://doi.org/10.1016/j.str.2019.03.020
- Primary Citation of Related Structures:
6H5T - PubMed Abstract:
The scaffolding protein intersectin 1 plays important roles in clathrin-mediated endocytosis and in the replenishment of release-ready synaptic vesicles (SV). Two splice variants of intersectin's SH3A domain are expressed in the brain, and association of the neuron-specific variant with synapsin I has been shown to enable sustained neurotransmission and to be regulated by an adjacent C-terminal motif. Here, we demonstrate that the ubiquitously expressed short SH3A variant of intersectin 1 interacts with an N-terminal intramolecular sequence that operates synergistically with the C-terminal motif. NMR spectroscopic investigations show that the five-amino acid insertion into the β strand 2 of the neuronal SH3A variant introduces conformational plasticity incompatible with binding of the N-terminal sequence. The difference in the autoregulatory mechanism of the domain's variants differentially affects its synaptic binding partners, thereby establishing alternative splicing in conjunction with autoinhibitory motif variation as a mechanism to regulate protein interaction networks.
Organizational Affiliation:
Protein Biochemistry, Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.
