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Chemistry in Industry : Journal of Chemists and Chemical Engineers of Croatia, Vol. 71 No. 7-8, 2022.

Original scientific paper

https://doi.org/10.15255/KUI.2021.075

Effects of Structural Changes in Bile Salt Hydrolase Enzyme on Biocatalytic Efficiency and Activation Energy at Working pH and Temperature Conditions

Yakup Ermurat ; Engineering Faculty, Department of Chemical Engineering, Bolu Abant Izzet Baysal University, Bolu 14 280, Turkey
Mehmet Öztürk ; Science and Literature Faculty, Department of Biology, Bolu Abant Izzet Baysal University, Bolu 14 280, Turkey
Cansu Önal ; Science and Literature Faculty, Department of Biology, Bolu Abant Izzet Baysal University, Bolu 14 280, Turkey
Zekiye Kılıçsaymaz ; Science and Literature Faculty, Department of Biology, Bolu Abant Izzet Baysal University, Bolu 14 280, Turkey

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Abstract

Microbial bile salt hydrolases (BSHs) catalyse the hydrolysis of glycine and taurine-linked bile salts in the small intestine of humans. Achieving the effects of structural changes in BSH molecules on biocatalytic efficiency (kcat/Km) and activation energy (Ea) is necessary to determine biocatalytic performances of the enzymes. Amino acids responsible for biocatalytic activity or substrate specificity in BSH molecules were modified to determine the effects of structural changes on kcat/Km values and Ea values of the bioconversion reactions. Purified wild type positive control enzyme (pCON2) and mutant recombinant target enzymes (F18L and Y24L) reacted with six conjugated pure bile salt substrates at working temperature and pH conditions. The results of the hydrolysis conversion analysis conducted at various pH conditions were used to estimate kcat/Km, and the assays conducted at various temperature conditions were used to approximate Ea of the biocatalytic reactions. The quantified kcat/Km value was found remarkably highest with mutant recombinant enzymes (Y24L), while the efficiency value with wild type (pCON2) was determined as lowest, indicating that the structural modifications in BSH molecules showed higher values. The alterations with the mutant-type enzymes F18L and Y24L resulted in decreasing kcat/Km and increasing Ea estimations of the hydrolysis conversion reactions.

Keywords

bile salt; wild hydrolase; recombinant hydrolase; biocatalytic efficiency; activation energy

Hrčak ID:

280678

URI

https://hrcak.srce.hr/280678

Publication date:

18.7.2022.

Article data in other languages: croatian

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