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. 2008 May 17;64(Pt 6):470–473. doi: 10.1107/S174430910801381X

Figure 1.

Figure 1

Cartoon representation of the crystal structure of DNA-free IntCB. The structure is shown in a rainbow color gradient from the N-terminus (blue) to the C-terminus (red). The lone sulfate ion is shown as a ball-and-stick model. IntCB folds into a four-helix bundle (helices A–D) with a flexible linker region at the C-terminus. The IntCB construct used in this study contains residues 75–176 of the full-length lambda integrase and a starting methionine (residue 74), but electron density was only observed between residues 74 and 166. The B factors are nearly uniform through out the protein, averaging 24 ± 5 Å2.