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DNA caught rock ‘n rollin’

ANN ARBOR, Mich.—DNA, that marvelous, twisty molecule of life, has an alter ego, research at the University of Michigan and the University of California, Irvine reveals.
On rare occasions, its building blocks “rock and roll,” deforming the famil…

Molecular machine shuffles beads on a DNA string

Yards of DNA are packed into cells by wrapping the DNA around proteins called nucleosomes. But that tight packing makes it hard for the cell’s machinery to get at the DNA code to read, copy or repair it. Now researchers at the University of California, Davis, have shown how two proteins form a molecular machine that shuffles the nucleosomes out of the way to expose the DNA double helix.