National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
United States
Citation
Journal: Nat Commun / Year: 2020 Title: Structural asymmetry governs the assembly and GTPase activity of McrBC restriction complexes. Authors: Yiming Niu / Hiroshi Suzuki / Christopher J Hosford / Thomas Walz / Joshua S Chappie / Abstract: McrBC complexes are motor-driven nucleases functioning in bacterial self-defense by cleaving foreign DNA. The GTP-specific AAA + protein McrB powers translocation along DNA and its hydrolysis ...McrBC complexes are motor-driven nucleases functioning in bacterial self-defense by cleaving foreign DNA. The GTP-specific AAA + protein McrB powers translocation along DNA and its hydrolysis activity is stimulated by its partner nuclease McrC. Here, we report cryo-EM structures of Thermococcus gammatolerans McrB and McrBC, and E. coli McrBC. The McrB hexamers, containing the necessary catalytic machinery for basal GTP hydrolysis, are intrinsically asymmetric. This asymmetry directs McrC binding so that it engages a single active site, where it then uses an arginine/lysine-mediated hydrogen-bonding network to reposition the asparagine in the McrB signature motif for optimal catalytic function. While the two McrBC complexes use different DNA-binding domains, these contribute to the same general GTP-recognition mechanism employed by all G proteins. Asymmetry also induces distinct inter-subunit interactions around the ring, suggesting a coordinated and directional GTP-hydrolysis cycle. Our data provide insights into the conserved molecular mechanisms governing McrB family AAA + motors.
Mass: 539.246 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3S / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interest
Y
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Experimental details
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Experiment
Experiment
Method: X-RAY DIFFRACTION / Number of used crystals: 1
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Sample preparation
Crystal
Density Matthews: 2.14 Å3/Da / Density % sol: 42.54 %
Crystal grow
Temperature: 298 K / Method: vapor diffusion, sitting drop / pH: 6.5 Details: 0.1M sodium acetate, pH 6.5, 17.5 % MPD with a drop size of 2 micro-liters and reservoir volume of 650 micro-liters.
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Data collection
Diffraction
Mean temperature: 100 K / Serial crystal experiment: N
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