FIG. 4.

3-D structure model of Rd domains AlkG1 and AlkG2. The 3-D models were generated by Swiss Model by using the P. furiosus and C. pasteurianum Rd structures as templates. The modeled structure of AlkG2 is shown in grey. Residues that are conserved in AlkG1- and AlkG2-type Rds, but not in other Rds, are shown in light blue (E15, E22, D41, and D49). Residues that are conserved in the AlkG2-type Rds, but not in the AlkG1-type Rds, are shown in purple (GAT43-46 and RFED29-32) while sequence features conserved in the AlkG1-type Rds are shown in green (N10, H21, and AVRD43-46). The iron-binding cysteines of AlkG2 are shown in red. Light blue, green, red, and purple residues are shown with side groups (with the exception of AlkG1 V44 and D46).