Structures and pH-dependent dimerization of the sevenless receptor tyrosine kinase.
Cerutti, G., Arias, R., Bahna, F., Mannepalli, S., Katsamba, P.S., Ahlsen, G., Kloss, B., Bruni, R., Tomlinson, A., Shapiro, L.(2024) Mol Cell 84: 4677-4690.e6
- PubMed: 39510067
- DOI: https://doi.org/10.1016/j.molcel.2024.10.017
- Primary Citation of Related Structures:
9BFP, 9BFQ, 9BFR, 9BFS, 9BFU - PubMed Abstract:
Sevenless (Sev) is a Drosophila receptor tyrosine kinase (RTK) required for the specification of the R7 photoreceptor. It is cleaved into α and β subunits and binds the ectodomain of the G-protein-coupled receptor bride of sevenless (Boss). Previous work showed that the Boss ectodomain could bind but not activate Sev; rather, the whole seven-pass transmembrane Boss was required. Here, we show that Sev does not need to be cleaved to function and that a single-pass transmembrane form of Boss activates Sev. We use cryo-electron microscopy and biophysical methods to determine the structural basis of ligand binding and pH-dependent dimerization of Sev, and we discuss the implications in the process of Sev activation. The Sev human homolog, receptor oncogene from sarcoma 1 (ROS1), is associated with oncogenic transformations, and we discuss their structural similarities.
Organizational Affiliation:
Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10027, USA.