Download MendeleyConversion of trypsin into a Na(+)-activated enzyme.
Page, M.J., Bleackley, M.R., Wong, S., MacGillivray, R.T., Di Cera, E.(2006) Biochemistry 45: 2987-2993
- PubMed: 16503653
- DOI: https://doi.org/10.1021/bi052481a
- Primary Citation of Related Structures:
2FMJ - PubMed Abstract:
Serine proteases of the chymotrypsin family show a dichotomous amino acid distribution for residue 225. Enzymes carrying Tyr at position 225 are activated by Na(+), whereas those carrying Pro are devoid of Na(+) binding and activation. Previous studies have demonstrated that the Y225P conversion is sufficient to abrogate Na(+) activation in several enzymes. However, the reverse substitution P225Y is necessary but not sufficient to introduce Na(+) binding and activation. Here we report that Streptomyces griseus trypsin, carrying Pro-225, can be engineered into a Na(+)-activated enzyme by replacing residues in the 170, 186, and 220 loops to those of coagulation factor Xa. The findings represent the first instance of an engineered Na(+)-activated enzyme and a proof of principle that should enable the design of other proteases with enhanced catalytic activity and allosteric regulation mediated by monovalent cation binding.
Organizational Affiliation:
Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Box 8231, St. Louis, Missouri 63110, USA.
