Elias Adriaenssens (@elias-adriaenssens.bsky.social)

Roles of microtubules and LIS1 in dynein transport machinery assembly | Nature Cytoplasmic dynein-1, a microtubule (MT)-based motor protein, requires dynactin and a coiled-coil adaptor to form the processive dynein–dynactin–adaptor (DDA) complex1,2. The roles of MTs and dynein regulator lissencephaly-1 (LIS1) in DDA assembly have remained elusive. Here we use cryo-electron microscopy to determine the structural basis of MT- and LIS1-mediated DDA assembly. We show that an adaptor-independent dynein–dynactin complex spontaneously forms on MTs with an intrinsic 2:1 stoichiometry in a highly efficient manner, driven by parallel alignment of dynein tails upon MT binding. Adaptors can wedge into and exchange within the assembled MT-bound dynein–dynactin complex; these processes are enabled by relative rotations between dynein and dynactin and facilitated by the dynein light-intermediate chains that assist the adaptor ‘search’ mechanism. Although LIS1 is dispensable for efficient DD(A)–MT assembly, its presence expands the conformational landscape of DD(A) assemblies on https://doi.org/10.1038/s41586-026-10153-y