Events - Daily
October 07, 2013 >>
|Monday, October 07|
Arup K Chakraborty, MIT, How to hit HIV where it hurts
Jadwin Hall 111 · 12:00 p.m.– 1:00 p.m.
Zev Bryant, Stanford, Remote control and high-resolution measurement for molecular motors research
Cytoskeletal motors perform critical force generation and transport functions in eukaryotic cells. Engineering molecular motors can provide direct tests of structure-function relationships and potential tools for controlling cellular processes. I will discuss the recent design and characterization of a panel of myosin motors that reversibly change gears — speed up, slow down, or switch directions — when exposed to blue light. Genetically encoded light-responsive motors will expand the optogenetics toolkit, complementing precise perturbations of ion channels and intracellular signaling with spatiotemporal control of cytoskeletal transport and contractility.
Simultaneous measurements of DNA twist and extension have been used to measure physical properties of the double helix and to characterize structural dynamics and mechanochemistry in nucleoprotein complexes. I will discuss the development of gold rotor bead tracking (AuRBT), which enables a >100X improvement in time resolution over previous twist measurement techniques. In an initial application to molecular motor mechanism, we have examined the structural dynamics of DNA gyrase at previously inaccessible timescales, revealing an unanticipated transient state visited during active supercoiling.
Zev Bryant is a native of Vancouver, B.C. and earned a B.Sc. in 1998 from the University of Washington, Seattle. He received a Ph.D. in 2003 from UC Berkeley, where he studied single-molecule DNA mechanics and topoisomerase function under Prof. Carlos Bustamante, in collaboration with Prof. Nicholas Cozzarelli. As a postdoctoral researcher with Prof. James Spudich, he investigated structure-function relationships in unconventional myosin motors. Since 2007, he has been an Assistant Professor of Bioengineering and (by courtesy) of Structural Biology at Stanford University. His research combines single-molecule measurements and protein engineering to dissect the physical mechanisms of biological molecular motors.
Carl Icahn Lab 101 · 4:15 p.m.– 5:15 p.m.