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Lac Repressor

DNA Loops

The crystal structures of the lac repressor show that it forms a bent structure, with all four of the DNA-binding portions pointing in one direction. Based on this structure, researchers have proposed that when all four subunits bind at the same time, the DNA is twisted into a small loop.

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PDB Molecule of the Month March 2003, by David S. Goodsell

Last changed by: A.Honegger, 8/4/06