title: Molecular wear of microtubules propelled by surface-adhered kinesins.
abstract: Wear is the progressive loss of material from a body caused by contact and relative movement and is a major concern in both engineering and biology. Advances in nanotechnology have allowed the origins of wear processes to be studied at the atomic and molecular scale, but also demand that wear in nanoscale systems can be predicted and controlled. Biomolecular systems can undergo a range of active movements at the nanoscale, which are enabled by the transduction of chemical energy into mechanical work by polymerization processes and motor proteins. The active movements are accompanied by dissipative processes that can be conceptually understood as 'protein friction'. Here, we show that wear also occurs in an in vitro system consisting of microtubules gliding across a surface coated with kinesin-1 motor proteins, and that energetic considerations suggest a molecule-by-molecule removal of tubulin proteins. The rates of removal show a complex dependence on sliding velocity and kinesin density, which, in contrast to the friction behaviour between microtubules and kinesin-8, cannot be explained by simple chemical reaction kinetics.
authors.affiliation: 1] Department of Biomedical Engineering, Columbia University, New York, New York 10027, USA [2] The Jacobs Technion-Cornell Institute at Cornell Tech, 111 8th Avenue #302, New York, New York 10011, USA.
authors.forename: Emmanuel L P
authors.initials: EL
authors.lastname: Dumont
authors.affiliation: Institute for Cancer Genetics, Columbia University Medical Center, New York, New York 10032, USA.
authors.forename: Catherine
authors.initials: C
authors.lastname: Do
authors.affiliation: Department of Biomedical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Henry
authors.identifier: 000000025617606X
authors.initials: H
authors.lastname: Hess
mesh_terms: D000818:Animals; D029721:Drosophila Proteins / Q000737:chemistry* / Q000378:metabolism; D004331:Drosophila melanogaster; D016547:Kinesins / Q000737:chemistry* / Q000378:metabolism; D008870:Microtubules / Q000737:chemistry* / Q000378:metabolism / Q000648:ultrastructure
chemical_list: D029721:Drosophila Proteins; C515209:Khc protein, Drosophila; D016547:Kinesins