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Ectopic A-lattice seams destabilize microtubules.
Miho Katsuki1, Douglas R Drummond2, Robert A Cross2
11] Division of Biomedical Cell Biology, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK [2].
Nature Communications
|January 28, 2014
Summary
Adding extra A-lattice seams to microtubules destabilizes them, increasing shrinkage rates. This suggests natural microtubule seams may regulate catastrophe, impacting microtubule dynamics.
Area of Science:
- Cell biology
- Biophysics
- Structural biology
Background:
- Microtubules are essential cytoskeletal polymers with helical B-lattice symmetry.
- Natural microtubules contain a single A-lattice seam, but its role in microtubule dynamics is unknown.
Purpose of the Study:
- To investigate the impact of A-lattice seams on microtubule dynamic instability.
- To determine how A-lattice seams affect microtubule shrinkage and catastrophe.
Main Methods:
- Utilized GMPCPP microtubules as structural analogues of GTP-bound microtubule caps.
- Investigated microtubules with varying numbers of A-lattice seams.
- Assessed microtubule growth rates and shrinkage rates.
- Examined microtubule stabilization by rigor kinesin.
Main Results:
- Extra A-lattice seams significantly destabilized GMPCPP microtubules, increasing shrinkage rates over 20-fold.
- Microtubules with extra A-lattice seams exhibited higher catastrophe frequencies at both ends.
- Microtubules with extra A-lattice seams showed limited stabilization by rigor kinesin compared to B-lattice microtubules.
Conclusions:
- Introducing extra A-lattice seams destabilizes microtubules, likely by destabilizing their GTP caps.
- The single A-lattice seam in natural microtubules may serve as a critical point for regulating catastrophe.
- Findings provide insights into microtubule structural dynamics and regulation.
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