27QA

Dictyostelium discoideum cytoplasmic dynein motor domain in the presence of ADP (Apo state 1)

Summary for 27QA

• Entry DOI: 10.2210/pdb27qa/pdb
• EMDB information: 81337
• Descriptor: Dynein heavy chain, cytoplasmic, ADENOSINE-5'-TRIPHOSPHATE, MAGNESIUM ION, ... (4 entities in total)
• Functional Keywords: dynein, atpase, motor protein, aaa+ protein
• Biological source: Dictyostelium discoideum AX2
• Total number of polymer chains: 1
• Total formula weight: 385717.23

Authors

Shimo-Kon, R.,Tokita, H.,Imai, H.,Maeshima, T.,Kon, T. (deposition date: 2026-06-09, release date: 2026-08-26)

Primary citation

Imai, H.,Kanazawa, R.,Maeshima, T.,Tran, D.P.,Shimo-Kon, R.,Tokita, H.,Miyata, T.,Makino, F.,Fujita, J.,Kato, T.,Kitao, A.,Namba, K.,Kon, T.
ADP-Bound States of Cytoplasmic Dynein: Cryo-electron Microscopy Reveals a Two-Step Post-Power-Stroke Transition and Roles of Regulatory ATPase Sites.
J.Mol.Biol., :169977-169977, 2026

PubMed Abstract: Cytoplasmic dynein is essential for intracellular transport and cell division, and its dysfunction is implicated in severe neurological disorders. Its motility is driven by the primary ATPase site in the AAA1 module and allosterically modulated by regulatory ATPase sites in the AAA3 and AAA4 modules. Despite recent structural advances, post-force-generating (post-power-stroke) transitions and the structural basis of AAA3/AAA4-mediated regulation remain elusive. Using cryo-electron microscopy, we captured intermediate structures of Dictyostelium discoideum cytoplasmic dynein. We identified two distinct ADP-bound states and two apo states, the latter comprising a partially nucleotide-free state with ADP retained at the AAA3 and AAA4 ATPase sites and a fully nucleotide-free state. For the AAA1 ATPase site, our structures and molecular dynamics simulations suggest a dynamic equilibrium between two ADP-bound states. In this model, linker swing and docking onto the AAA5 module can be driven by thermal fluctuations while ADP remains bound at the AAA1 ATPase site, shifting the motor from a canonical ADP-bound state to a metastable apo-like conformation with reduced ADP affinity. This transition could provide a framework for tension-sensing coordination. For the AAA3 and AAA4 ATPase sites, comparison of the partially and fully nucleotide-free apo structures indicates that ADP release induces localized outward tilting of the corresponding large submodules. We propose that this rearrangement displaces the AAA4 Pre-Sensor-I insert from the linker, thereby disfavoring the recovery stroke and stabilizing an inactive state. Together, our findings provide a mechanistic model in which coordinated conformational dynamics across multiple ATPase sites govern dynein's chemomechanical cycle.

PubMed: 42562341
DOI: 10.1016/j.jmb.2026.169977

Experimental method

ELECTRON MICROSCOPY (2.76 Å)