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A crystal structure of the C-terminal domain of Escherichia coli UvrB (UvrB') has been solved to 3.0 9 resolution. The domain adopts a helix-loop-helix fold which is stabilised by the packing of hydrophobic side-chains between helices. From the UvrB' fold, a model for a domain of UvrC (UvrC') that has high sequence homology with UvrB' has been made. In the crystal, a dimerisation of UvrB' domains...