Markova_2020_Chem.Sci_11_11162

Reference

Title : Decoding the intricate network of molecular interactions of a hyperstable engineered biocatalyst - Markova_2020_Chem.Sci_11_11162
Author(s) : Markova K , Chmelova K , Marques SM , Carpentier P , Bednar D , Damborsky J , Marek M
Ref : Chem Sci , 11 :11162 , 2020
Abstract :

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 degreesC; deltaT (m) > 23 degreesC). 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 A and 1.6 A resolutions and their molecular dynamics trajectories, which unravel the intricate network of interactions that reinforce the alphabetaalpha-sandwich architecture. Unexpectedly, mutations toward bulky aromatic amino acids at the protein surface triggered long-distance (-27 A) 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.

PubMedSearch : Markova_2020_Chem.Sci_11_11162
PubMedID: 34094357
Gene_locus related to this paper: rhoso-halo1

Related information

Gene_locus rhoso-halo1
Structure 6SP8    6SP5

Citations formats

Markova K, Chmelova K, Marques SM, Carpentier P, Bednar D, Damborsky J, Marek M (2020)
Decoding the intricate network of molecular interactions of a hyperstable engineered biocatalyst
Chem Sci 11 :11162

Markova K, Chmelova K, Marques SM, Carpentier P, Bednar D, Damborsky J, Marek M (2020)
Chem Sci 11 :11162