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Molecular engineering of a backwards-moving myosin motor

Georgios Tsiavaliaris, Setsuko Fujita-Becker and Dietmar J. Manstein ()
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Georgios Tsiavaliaris: Institut für Biophysikalische Chemie, Medizinische Hochschule Hannover
Setsuko Fujita-Becker: Abteilung Biophysik, Max-Planck-Institut für Medizinische Forschung
Dietmar J. Manstein: Institut für Biophysikalische Chemie, Medizinische Hochschule Hannover

Nature, 2004, vol. 427, issue 6974, 558-561

Abstract: Abstract All members of the diverse myosin superfamily have a highly conserved globular motor domain that contains the actin- and nucleotide-binding sites and produces force and movement1,2. The light-chain-binding domain connects the motor domain to a variety of functionally specialized tail domains and amplifies small structural changes in the motor domain through rotation of a lever arm3,4. Myosins move on polarized actin filaments either forwards to the barbed (+ ) or backwards to the pointed (- ) end5,6. Here, we describe the engineering of an artificial backwards-moving myosin from three pre-existing molecular building blocks. These blocks are: a forward-moving class I myosin motor domain, a directional inverter formed by a four-helix bundle segment of human guanylate-binding protein-1 and an artificial lever arm formed by two α-actinin repeats. Our results prove that reverse-direction movement of myosins can be achieved simply by rotating the direction of the lever arm 180°.

Date: 2004
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DOI: 10.1038/nature02303

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