The 35,000 or so genes within a human cell are something like players on a sports team: If their activity isnt controlled and coordinated, the result can be disastrous.
So just as coaches tell individual players when to scramble onto the field and when to stay on the bench, molecules called transcription factors prompt particular genes to be active or stay quiet. Transcription factors occur naturally in cells, but researchers have been working to develop artificial transcription factors (ATFs) that can be tailored to regulate particular genes or sets of genes. These molecules can help scientists probe transcription, the first step in the process through which instructions coded in genes are used to produce proteins. And because errors in transcription are linked to diseases ranging from diabetes to cancer, ATFs eventually might also be used to correct those mistakes.
Using a new approach to developing ATFs, University of Michigan assistant professor of chemistry Anna Mapp and coworkers have gained important insights into the workings of gene-activating transcription factors. They recently discovered that the gene-activating power of a transcription factor likely depends on where the factor binds to the cells transcriptional machinery, as well as on how tightly it binds. Previously, researchers had thought that binding affinity (tightness) was the main determinant of a gene activators potency. Mapp presented the groups results at the annual meeting of the American Chemical Society in New York today (Sept. 8).
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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