Download MendeleyComputational design of the temperature optimum of an enzyme reaction.
van der Ent, F., Skagseth, S., Lund, B.A., Socan, J., Griese, J.J., Brandsdal, B.O., Aqvist, J.(2023) Sci Adv 9: eadi0963-eadi0963
- PubMed: 37379391
- DOI: https://doi.org/10.1126/sciadv.adi0963
- Primary Citation of Related Structures:
8CQF, 8CQG - PubMed Abstract:
Cold-adapted enzymes are characterized both by a higher catalytic activity at low temperatures and by having their temperature optimum down-shifted, compared to mesophilic orthologs. In several cases, the optimum does not coincide with the onset of protein melting but reflects some other type of inactivation. In the psychrophilic α-amylase from an Antarctic bacterium, the inactivation is thought to originate from a specific enzyme-substrate interaction that breaks around room temperature. Here, we report a computational redesign of this enzyme aimed at shifting its temperature optimum upward. A set of mutations designed to stabilize the enzyme-substrate interaction were predicted by computer simulations of the catalytic reaction at different temperatures. The predictions were verified by kinetic experiments and crystal structures of the redesigned α-amylase, showing that the temperature optimum is indeed markedly shifted upward and that the critical surface loop controlling the temperature dependence approaches the target conformation observed in a mesophilic ortholog.
Organizational Affiliation:
Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, Box 596, SE-751 24 Uppsala, Sweden.
