FIG. 10.

Structure of the class 2A PutA, GsPutA. (A) Ribbon drawing of the protomer (PDB code 4NM9). The pink surface represents the substrate-channeling tunnel. The domains are colored according to the legend. The dashes denote a disordered section of the linker domain. (B) Ribbon drawing of the dimer, with the two protomers colored green and blue. The pink surface represents the substrate-channeling tunnel. The inset shows a close-up view of the dimerization domain covering the substrate-channeling tunnel. Figure adapted from Singh et al. (117). To see this illustration in color, the reader is referred to the web version of this article at www.liebertpub.com/ars