School of Life Sciences
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Claire Friel

Assistant Professor in Protein Biochemistry, Faculty of Medicine & Health Sciences

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Research Summary

Cytoskeletal Dynamics and the Mechanochemistry of Motor Proteins

The major interest of my lab is the role of the kinesin family of motor proteins in controlling cytoskeletal dynamics. Kinesins are crucial engines of eukaryotic self-organisation. Members of the kinesin super-family interact with the microtubule cytoskeleton and play a vital role in transport of cellular cargo and in cell division.

Microtubules are long slender polymers of the protein tubulin. The microtubule cytoskeleton serves as rails for intracellular transport, plays an essential role in positioning and movement of cellular organelles and forms the mitotic spindle which separates sister chromosomes during cell division. The organisation and dynamics of the microtubule cytoskeleton are controlled by accessory proteins, such as the kinesin super-family. Kinesins are motor proteins that hydrolyse ATP to bring about conformational changes within the characteristic motor domain and thereby alter the strength of the kinesin-microtubule interaction. The majority of kinesins translocate along the microtubule using the nucleotide-dependent cycle of binding and detachment to transport cellular cargo. However, one class of kinesins (kinesin-13) does not translocate, but instead diffuses to the end of the microtubule where it binds and depolymerises the microtubule substrate. Microtubule depolymerases are crucial during mitosis, being involved in generating the force required to separate sister chromatids and also in ensuring the correct segregation of chromosomes by correcting inappropriate kinetochore-microtubule attachments.

Work in my lab is currently focused on the molecular mechanisms of microtubule depolymerising kinesins; using as a model the Mitotic Centromere-Associated Kinesin (MCAK), which plays a crucial role in cell division.

Selected Publications

School of Life Sciences

University of Nottingham
Medical School
Queen's Medical Centre
Nottingham NG7 2UH

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