Design of the Affibody.BirA*
fusion constructs, ZEGFR:1907.BirA* and ZHER2:342.BirA*. (A) Amino-acid sequences of
ZEGFR:1907.BirA* (top) or ZHER2:342.BirA* (bottom).
The affibody ligand sequence (in bold characters) is followed by a
linker region (italics), a C-terminal BirA* catalytic domain (underlined),
and ending with a hexahistidine tag. (B) Ribbon representation of
the Affibody.BirA* fusion construct, ZEGFR:1907.BirA* generated
from the I-TASSER server.17 Color pattern:
affibody ligand (in green), linker containing a TEV cleavage site
(in yellow), C-terminal BirA* catalytic domain (in cyan), and a histidine
tag (in red). The location of the R118G mutation in BirA* is highlighted
in red (magnified image).