Prof. Arne Gennerich (Albert Einstein College of Medicine) will be visiting Tuesday, April 7 and giving a 4 pm seminar in Bass 305.
Abstract:
Cytoplasmic dynein is a microtubule motor involved in cargo transport, nuclear migration and cell division. Despite structural conservation of the dynein motor domain from yeast to higher eukaryotes, the extensively studied S. cerevisiae dynein behaves distinctly from mammalian dyneins, which produce far less force and travel over shorter distances. However, isolated reports of yeast-like force production by mammalian dynein have called interspecies differences into question. In this seminar, I will discuss our recent finding that functional differences between yeast and mammalian dynein are real and attributable to a C-terminal motor element absent in yeast, which resembles a “cap” over the central pore of the mammalian dynein motor domain. Removal of this cap increases the force generation of rat dynein from 1 pN to a yeast-like 6 pN and greatly increases its travel distance. Our findings identify the CT-cap as the first motor protein element responsible for controlling force production, which may potentially represent a novel locus for dynein regulation.