5nug
Motor domains from human cytoplasmic dynein-1 in the phi-particle conformationMotor domains from human cytoplasmic dynein-1 in the phi-particle conformation
Structural highlights
Disease[DYHC1_HUMAN] Autosomal dominant childhood-onset proximal spinal muscular atrophy without contractures;Autosomal dominant non-syndromic intellectual disability;Autosomal dominant Charcot-Marie-Tooth disease type 2O. The disease is caused by mutations affecting the gene represented in this entry. The disease is caused by mutations affecting the gene represented in this entry. The disease is caused by mutations affecting the gene represented in this entry. Function[DYHC1_HUMAN] Cytoplasmic dynein 1 acts as a motor for the intracellular retrograde motility of vesicles and organelles along microtubules. Dynein has ATPase activity; the force-producing power stroke is thought to occur on release of ADP. Plays a role in mitotic spindle assembly and metaphase plate congression (PubMed:27462074).[1] Publication Abstract from PubMedCytoplasmic dynein-1 binds dynactin and cargo adaptor proteins to form a transport machine capable of long-distance processive movement along microtubules. However, it is unclear why dynein-1 moves poorly on its own or how it is activated by dynactin. Here, we present a cryoelectron microscopy structure of the complete 1.4-megadalton human dynein-1 complex in an inhibited state known as the phi-particle. We reveal the 3D structure of the cargo binding dynein tail and show how self-dimerization of the motor domains locks them in a conformation with low microtubule affinity. Disrupting motor dimerization with structure-based mutagenesis drives dynein-1 into an open form with higher affinity for both microtubules and dynactin. We find the open form is also inhibited for movement and that dynactin relieves this by reorienting the motor domains to interact correctly with microtubules. Our model explains how dynactin binding to the dynein-1 tail directly stimulates its motor activity. Cryo-EM Reveals How Human Cytoplasmic Dynein Is Auto-inhibited and Activated.,Zhang K, Foster HE, Rondelet A, Lacey SE, Bahi-Buisson N, Bird AW, Carter AP Cell. 2017 Jun 15;169(7):1303-1314.e18. doi: 10.1016/j.cell.2017.05.025. Epub, 2017 Jun 8. PMID:28602352[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
|
| ||||||||||||||||