Figure 1.
General view of Bse634I restriction endonuclease. (A) Ribbon representation of a Bse634I dimer. Structural elements involved in dimerization are shown in orange (subunit A) and yellow (subunit B); β-sheets are shown in blue. (B) Arrangement of the protein chains in the crystal suggesting possible structure of the Bse634I tetramer. Chain A is in red, chain B is in yellow, chain C is in blue and chain D in magenta. A crystallographic 2-fold axis relating A to C and B to D is perpendicular to the figure plane and passes through the center of the picture. (C) Ribbon representation of the Bse634I monomer in stereo. The color changes from blue to red following residues from N-terminus to C-terminus.