Publication details

Decoding the intricate network of molecular interactions of a hyperstable engineered biocatalyst

Authors

MARKOVÁ Klára CHMELOVÁ Klaudia MARQUES Sérgio Manuel CARPENTIER Philippe BEDNÁŘ David DAMBORSKÝ Jiří MAREK Martin

Year of publication 2020
Type Article in Periodical
Magazine / Source Chemical Science
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1039/D0SC03367G
Doi http://dx.doi.org/10.1039/d0sc03367g
Keywords Small-angle scattering; Candida antarctica lipase B
Attached files
Description Computational design of protein catalysts with enhanced stabilities for use in research and enzyme technologies is a challenging task. Using force-field calculations and phylogenetic analysis, we previously designed the haloalkane dehalogenase DhaA115 which contains 11 mutations that confer upon it outstanding thermostability (T-m = 73.5 degrees C; Delta T-m > 23 degrees C). An understanding of the structural basis of this hyperstabilization is required in order to develop computer algorithms and predictive tools. Here, we report X-ray structures of DhaA115 at 1.55 angstrom and 1.6 angstrom resolutions and their molecular dynamics trajectories, which unravel the intricate network of interactions that reinforce the aba-sandwich architecture. Unexpectedly, mutations toward bulky aromatic amino acids at the protein surface triggered long-distance (similar to 27 angstrom) backbone changes due to cooperative effects. These cooperative interactions produced an unprecedented double-lock system that: (i) induced backbone changes, (ii) closed the molecular gates to the active site, (iii) reduced the volumes of the main and slot access tunnels, and (iv) occluded the active site. Despite these spatial restrictions, experimental tracing of the access tunnels using krypton derivative crystals demonstrates that transport of ligands is still effective. Our findings highlight key thermostabilization effects and provide a structural basis for designing new thermostable protein catalysts.
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