Stereoselectivity and Conformational Stability of Haloalkane Dehalogenase DbjA from Bradyrhizobium japonicum USDA110: The Effect of pH and Temperature.

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Authors

CHALOUPKOVÁ Radka PROKOP Zbyněk SATO Yukari NAGATA Yuji DAMBORSKÝ Jiří

Year of publication 2011
Type Article in Periodical
Magazine / Source FEBS Journal
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1111/j.1742-4658.2011.08203.x
Field Biochemistry
Keywords DbJA; Enantioselectivity;Haloalkane Dehalogenase
Description The effect of pH and temperature on structure, stability, activity and enantioselectivity of haloalkane dehalogenase DbjA from Bradyrhizobium japonicum USDA110 was investigated in this study. Conformational changes have been assessed by circular dichroism spectroscopy, functional changes by kinetic analysis, while quaternary structure was studied by gel filtration chromatography. Our study shows that the DbjA enzyme is highly tolerant to pH changes. Its secondary and tertiary structure was not affected by pH in the range of 5.3-10.3 and 6.2-10.1, respectively. Oligomerization of DbjA was strongly pH-dependent: monomer, dimer, tetramer and a high molecular weight cluster of the enzyme was distinguished in solution at different pH conditions. Moreover, different oligomeric states of DbjA possessed different thermal stability.
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