National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM147332
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
RO1GM113164
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM103310
United States
Citation
Journal: Nat Commun / Year: 2026 Title: Pathogenic KIF1A R350 mutations disrupt a conserved and conformation-dependent kinesin-tubulin salt bridge. Authors: Abhipsa Shatarupa / Lu Rao / Ana B Asenjo / Arne Gennerich / Hernando Sosa / Abstract: Pathogenic variants in the motor domain of the kinesin-3 motor protein KIF1A cause a range of neurodevelopmental and neurodegenerative conditions collectively termed KIF1A-associated neurological ...Pathogenic variants in the motor domain of the kinesin-3 motor protein KIF1A cause a range of neurodevelopmental and neurodegenerative conditions collectively termed KIF1A-associated neurological disorder (KAND). Among these, mutations at residue R350 are linked to hereditary spastic paraplegia and altered motor function. Yet, the structural basis for their pathogenicity remains unclear. Here, we present high-resolution cryo-electron microscopy (cryo-EM) structures of KIF1A R350G and R350W bound to microtubules in both the apo and AMP-PNP-bound states. We identify a salt bridge between KIF1A residue R350 and α-tubulin E415 that forms only in the open conformation of the motor domain and is disrupted in both mutants. The loss of this electrostatic interaction correlates with increased velocity, reduced processivity, and decreased microtubule affinity in the open, apo conformation, as demonstrated by single-molecule assays. Our results reveal an electrostatic interaction at the motor-microtubule interface that regulates KIF1A's motility behavior.
Details: BRB80 buffer composed of 80 mM PIPES, 2 mM MgCl2, 1 mM EGTA, PH 6.8
Grid
Model: UltrAuFoil / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Atmosphere: OTHER / Details: The grid used was UltrAuFoil R0.6/1
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: 4uL of a 6uM MT solution in BRB80 (80mM PIPES, 2mM MgCl2, 1mM EGTA pH 6.8) along with 20uM paclitaxel was added onto a plasma-cleaned grid. The MTs were incubated for 1 minute at room ...Details: 4uL of a 6uM MT solution in BRB80 (80mM PIPES, 2mM MgCl2, 1mM EGTA pH 6.8) along with 20uM paclitaxel was added onto a plasma-cleaned grid. The MTs were incubated for 1 minute at room temperature, and then the excess liquid was removed from the grid using Whatman #1 paper. Next, 4uL of a solution containing 17.5uM KIF1A-R350W in BRB80 supplemented with 20uM paclitaxel and 0.005 units per uL apyrase was added to the grid. The grid with the MT and kinesin mixture was then mounted into a Vitrobot, incubated for 1 minute at room temperature, and plunge-frozen into liquid nitrogen-cooled ethane..
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Electron microscopy
Microscope
TFS KRIOS
Specialist optics
Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 8344 / Average exposure time: 1.32 sec. / Average electron dose: 57.96 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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