Stepwise Enhancement of Catalytic Performance of Haloalkane Dehalogenase LinB towards β-Hexachlorocyclohexane

Authors

Moriuchi, R., Tanaka, H., Nikawadori, Y., Ishitsuka, M., Ito, M., Ohtsubo, Y., Tsuda, M., Damborsky, J., Prokop, Z., Nagata, Y.

Source

APPLIED MICROBIOLOGY AND BIOTECHNOLOGY EXPRESS 4: 72 (2014)

Abstract

Two haloalkane dehalogenases, LinB_UT and LinB_MI, each with 296 amino acid (aa) residues, exhibit only seven amino acid residue differences between them, but LinB_MI‘s catalytic performance towards β-hexachlorocyclohexane (β-HCH) is considerably higher than LinB_UT‘s. To elucidate the molecular basis governing this difference, intermediate mutants between LinB_UT and LinB_MI were constructed and kinetically characterized. The activities of LinB_UT-based mutants gradually increased by cumulative mutations into LinB_UT, and the effects of the individual amino acid substitutions depended on combination with other mutations. These results indicated that LinB_UT‘s b-HCH degradation activity can be enhanced in a stepwise manner by the accumulation of point mutations.

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Citation

Moriuchi, R., Tanaka, H., Nikawadori, Y., Ishitsuka, M., Ito, M., Ohtsubo, Y., Tsuda, M., Damborsky, J., Prokop, Z., Nagata, Y., 2014: Stepwise Enhancement of Catalytic Performance of Haloalkane Dehalogenase LinB towards β-Hexachlorocyclohexane. Applied Microbiology and Biotechnology Express 4: 72.