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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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The centimeter-long DNAs in our cells are folded up into micron-scale chromosomes through an array of protein-DNA interactions. Our group uses single-DNA micromanipulation – stretching and twisting of the double helix – as a tool to analyze a variety of enzymes acting on DNA. I will describe a few different kinds of “magnetic tweezers” experiments we are doing that are aimed at understanding enzymes that help to package DNA and to change its topology. We also use analogous but larger-scale micropipette-based micromanipulation approaches to study the large-scale structure of metaphase chromosomes.
I will discuss experiments that tell us the metaphase chromosomes behave as “chromatin gels”, apparently stabilized in part by DNA entanglement. Recent experiments on effects of depletion of condensin SMC complexes - thought to be major "crosslinkers" of chromosomes - will also be discussed.
