Structures of the N-terminally truncated
proteins BVU_4064 and BF1687 (PDB codes 3kog and 3g3l, respectively). The N-terminal domain (in slate blue color) and the C-terminal domain (in orange color) of the 3kog structure show significant similarities with the corresponding domains of 3g3l structure (N and C terminal domains shown in pale cyan and wheat colors respectively). In contrast, the region connecting the domains (in green) is clearly different in the two structures: a short linker in 3kog, an extended 4-helix insertion and one extra strand that is added to the C-terminal domain in 3g3l. A histidine-rich region present at the C-terminus in both of our proteins is found ordered only in the 3kog structure (see box with text in the Figure).