Download MendeleyStructure of the human BBSome core complex.
Klink, B.U., Gatsogiannis, C., Hofnagel, O., Wittinghofer, A., Raunser, S.(2020) Elife 9
- PubMed: 31951201
- DOI: https://doi.org/10.7554/eLife.53910
- Primary Citation of Related Structures:
6XT9, 6XTB - PubMed Abstract:
The BBSome is a heterooctameric protein complex that plays a central role in primary cilia homeostasis. Its malfunction causes the severe ciliopathy Bardet-Biedl syndrome (BBS). The complex acts as a cargo adapter that recognizes signaling proteins such as GPCRs and links them to the intraflagellar transport machinery. The underlying mechanism is poorly understood. Here we present a high-resolution cryo-EM structure of a human heterohexameric core subcomplex of the BBSome. The structure reveals the architecture of the complex in atomic detail. It explains how the subunits interact with each other and how disease-causing mutations hamper this interaction. The complex adopts a conformation that is open for binding to membrane-associated GTPase Arl6 and a large positively charged patch likely strengthens the interaction with the membrane. A prominent negatively charged cleft at the center of the complex is likely involved in binding of positively charged signaling sequences of cargo proteins.
Organizational Affiliation:
Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany.
