National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM071940
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM077190
United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI094386
United States
National Science Foundation (NSF, United States)
XSEDE MCB140140
United States
Citation
Journal: Structure / Year: 2020 Title: D-loop Dynamics and Near-Atomic-Resolution Cryo-EM Structure of Phalloidin-Bound F-Actin. Authors: Sanchaita Das / Peng Ge / Zeynep A Oztug Durer / Elena E Grintsevich / Z Hong Zhou / Emil Reisler / Abstract: Detailed molecular information on G-actin assembly into filaments (F-actin), and their structure, dynamics, and interactions, is essential for understanding their cellular functions. Previous studies ...Detailed molecular information on G-actin assembly into filaments (F-actin), and their structure, dynamics, and interactions, is essential for understanding their cellular functions. Previous studies indicate that a flexible DNase I binding loop (D-loop, residues 40-50) plays a major role in actin's conformational dynamics. Phalloidin, a "gold standard" for actin filament staining, stabilizes them and affects the D-loop. Using disulfide crosslinking in yeast actin D-loop mutant Q41C/V45C, light-scattering measurements, and cryoelectron microscopy reconstructions, we probed the constraints of D-loop dynamics and its contribution to F-actin formation/stability. Our data support a model of residues 41-45 distances that facilitate G- to F-actin transition. We report also a 3.3-Å resolution structure of phalloidin-bound F-actin in the ADP-Pi-like (ADP-BeFx) state. This shows the phalloidin-binding site on F-actin and how the relative movement between its two protofilaments is restricted by it. Together, our results provide molecular details of F-actin structure and D-loop dynamics.
History
Deposition
Sep 6, 2019
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Header (metadata) release
Oct 2, 2019
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Map release
May 13, 2020
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Update
May 20, 2020
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Current status
May 20, 2020
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Details: unspecified
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TITAN KRIOS
Temperature
Min: 80.0 K / Max: 81.0 K
Specialist optics
Energy filter - Name: GIF Quantum LS
Image recording
Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 3-12 / Number grids imaged: 1 / Number real images: 5874 / Average exposure time: 8.0 sec. / Average electron dose: 80.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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