Figure 2.

Packing and interactions of Cys38 and Cys52 in wild-type Rop. Residues within 5 Å are shown at the top, and atoms within 5 Å of the Cys sulfur atoms are shown below. Mint-colored carbons are from the other monomer. At left, Cys38 may make a hydrogen bond to the carbonyl oxygen of Thr19, but it is well-packed with mostly hydrophobic residues nearby. At right, Cys52 is slightly further from the carbonyl oxygen of Leu48 but appears to be much less tightly packed. Rendered from 1ROP with PyMOL.