Abstract
Gene product 12 of bacteriophage T4, adhesin, serves to adhere the virus to host cells. Adhesin is a fibrous homotrimer, and a novel tertiary structure element, a β-helix, is supposed to be a major structural feature of this protein. We have constructed two truncated gp12 mutants, 12N1 and 12N2, containing 221 and 135 N-terminal residues, respectively. When expressed in E. coli cells, these gp12 fragments formed labile β-structural trimers. Another hybrid protein, 12FN, containing 179 N-terminal amino acid residues of gp12 fused to the C-terminal domain (31 amino acids) of T4 fibritin, was shown to have a trimeric proteolytically resistant a-helical structure. This structure is probably similar to that of fibritin, which has a triple α-helical coiled-coil structure. Hence, we have demonstrated the possibility of global transformation of fibrous protein structure using fusion with a C-terminal domain that initiates trimerization.
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Miroshnikov, K.A., Sernova, N.V., Shneider, M.M. et al. Transformation of a Fragment of β-Structural Bacteriophage T4 Adhesin to Stable α-Helical Trimer. Biochemistry (Moscow) 65, 1346–1351 (2000). https://doi.org/10.1023/A:1002888419749
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DOI: https://doi.org/10.1023/A:1002888419749