ジャーナル: Elife / 年: 2020 タイトル: Structure of the human BBSome core complex. 著者: Björn Udo Klink / Christos Gatsogiannis / Oliver Hofnagel / Alfred Wittinghofer / Stefan Raunser / 要旨: 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 ...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.
名称: BBSome core complex / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: BBSome core complex containing BBS1,4, 8, 9 and 18. BBS5 was also present in the sample preparation, but was only visible in a subset of particles (see related entry)
モデルのタイプ: INSILICO MODEL In silico モデル: Initial models were generated de novo using RaptorX for most of the structure. 詳細: For building an atomic model of the beta propeller domains, we used the two available crystal structures of the beta propeller domains of C. reinhardtii BBS1 (PDB ID 4V0M) and of human BBS9 ...詳細: For building an atomic model of the beta propeller domains, we used the two available crystal structures of the beta propeller domains of C. reinhardtii BBS1 (PDB ID 4V0M) and of human BBS9 (PDB ID 4YD8) as starting points.