National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
HL016037-50
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM133598
米国
Human Frontier Science Program (HFSP)
LT000174/2018
フランス
European Molecular Biology Organization (EMBO)
ALTF 1071-2017
European Union
引用
ジャーナル: bioRxiv / 年: 2025 タイトル: Mechanism of beta-arrestin 1 mediated Src activation via Src SH3 domain revealed by cryo-electron microscopy. 著者: Natalia Pakharukova / Brittany N Thomas / Harsh Bansia / Linus Li / Dana K Bassford / Rinat R Abzalimov / Jihee Kim / Alem W Kahsai / Biswaranjan Pani / Kunhong Xiao / Roni Ochakovski / Shibo ...著者: Natalia Pakharukova / Brittany N Thomas / Harsh Bansia / Linus Li / Dana K Bassford / Rinat R Abzalimov / Jihee Kim / Alem W Kahsai / Biswaranjan Pani / Kunhong Xiao / Roni Ochakovski / Shibo Liu / Xingdong Zhang / Seungkirl Ahn / Amedee des Georges / Robert J Lefkowitz / 要旨: Beta-arrestins (βarrs) are key regulators and transducers of G-protein coupled receptor signaling; however, little is known of how βarrs communicate with their downstream effectors. Here, we report ...Beta-arrestins (βarrs) are key regulators and transducers of G-protein coupled receptor signaling; however, little is known of how βarrs communicate with their downstream effectors. Here, we report the first structural insights into the fundamental mechanisms driving βarr-mediated signal transduction. Using cryo-electron microscopy, we elucidate how βarr1 recruits and activates the non-receptor tyrosine kinase Src, the first identified signaling partner of βarrs. βarr1 engages Src SH3 through two distinct sites, each employing a different recognition mechanism: a polyproline motif in the N-domain and a non-proline-based interaction in the central crest region. At both sites βarr1 interacts with the aromatic surface of SH3, disrupting the autoinhibited conformation of Src and directly triggering its allosteric activation. This structural evidence establishes βarr1 as an active regulatory protein rather than a passive scaffold and suggests a potentially general mechanism for βarr-mediated signaling across diverse effectors.
超分子 #1: Beta-arrestin 1 bound to a G protein-coupled receptor phosphopept...
超分子
名称: Beta-arrestin 1 bound to a G protein-coupled receptor phosphopeptide, nanobody 32 and antibody fragment Fab30 in complex with SH3 domain of Src タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all