Abstract
Restriction endonuclease BamHI from Bacillus amyloliquefaciens has been co-crystallized with a 12 bp DNA fragment that encompasses its recognition site. The co-crystals diffract to at least 1·95 Å resolution and belong to space group P 212121. The unit cell parameters are a = 108·8 Å, b = 81·9 Å, c = 68·8 Å, consistent with one complex in the crystallographic asymmetric unit. The direction of the DNA appears to be along the b axis. In order to achieve end to end stacking of DNA, the complex must lie on the screw axis along b. A self-rotation function has determined the directions of the non-crystallographic 2-fold axes.
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