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Stabilization of a (βα)<sub>8</sub>‐barrel protein by an engineered disulfide bridge

Stabilization of a (βα)8‐barrel protein by an engineered disulfide bridge

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IVENS, Andreas, Olga MAYANS, Halina SZADKOWSKI, Catharina JÜRGENS, Matthias WILMANNS, Kasper KIRSCHNER, 2002. Stabilization of a (βα)8‐barrel protein by an engineered disulfide bridge. In: European Journal of Biochemistry. 269(4), pp. 1145-1153. ISSN 0014-2956. eISSN 1432-1033. Available under: doi: 10.1046/j.1432-1033.2002.02745.x

@article{Ivens2002-02-20Stabi-42020, title={Stabilization of a (βα)8‐barrel protein by an engineered disulfide bridge}, year={2002}, doi={10.1046/j.1432-1033.2002.02745.x}, number={4}, volume={269}, issn={0014-2956}, journal={European Journal of Biochemistry}, pages={1145--1153}, author={Ivens, Andreas and Mayans, Olga and Szadkowski, Halina and Jürgens, Catharina and Wilmanns, Matthias and Kirschner, Kasper} }

Jürgens, Catharina Jürgens, Catharina 2018-04-12T07:25:56Z Mayans, Olga Kirschner, Kasper Wilmanns, Matthias terms-of-use Wilmanns, Matthias 2002-02-20 Ivens, Andreas 2018-04-12T07:25:56Z Ivens, Andreas Kirschner, Kasper Szadkowski, Halina The aim of this study was to increase the stability of the thermolabile (βα)<sub>8</sub>‐barrel enzyme indoleglycerol phosphate synthase from Escherichia coli by the introduction of disulfide bridges. For the design of such variants, we selected two out of 12 candidates, in which newly introduced cysteines potentially form optimal disulfide bonds. These variants avoid short‐range connections, substitutions near catalytic residues, and crosslinks between the new and the three parental cysteines. The variant linking residues 3 and 189 fastens the N‐terminus to the (βα)<sub>8</sub>‐barrel. The rate of thermal inactivation at 50 °C of this variant with a closed disulfide bridge is 65‐fold slower than that of the reference dithiol form, but only 13‐fold slower than that of the parental protein. The near‐ultraviolet CD spectrum, the reactivity of parental buried cysteines with Ellman's reagent as well as the decreased turnover number indicate that the protein structure is rigidified. To confirm these data, we have solved the X‐ray structure to 2.1‐Å resolution. The second variant was designed to crosslink the terminal modules βα1 and βα8. However, not even the dithiol form acquired the native fold, possibly because one of the targeted residues is solvent‐inaccessible in the parental protein. Szadkowski, Halina Stabilization of a (βα)<sub>8</sub>‐barrel protein by an engineered disulfide bridge eng Mayans, Olga

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