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Molecular genetic and crystal structural analysis of 1-(4-hydroxyphenyl)-ethanol dehydrogenase from 'Aromatoleum aromaticum' EbN1.

MPG-Autoren
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Wöhlbrand,  Lars
Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Rabus,  Ralf
Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Zitation

Büsin, I., Höffken, H. W., Breuer, M., Wöhlbrand, L., Hauer, B., & Rabus, R. (2015). Molecular genetic and crystal structural analysis of 1-(4-hydroxyphenyl)-ethanol dehydrogenase from 'Aromatoleum aromaticum' EbN1. Journal of Molecular Microbiology and Biotechnology, 25: 1, pp. 327-339.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-C3CA-F
Zusammenfassung
he dehydrogenation of 1-(4-hydroxyphenyl)-ethanol to 4-hydroxyacetophenone represents the second reaction step during anaerobic degradation of p-ethylphenol in the denitrifying bacterium ‘Aromatoleum aromaticum' EbN1. Previous proteogenomic studies identified two different proteins (ChnA and EbA309) as possible candidates for catalyzing this reaction [Wöhlbrand et al: J Bacteriol 2008;190:5699-5709]. Physiological-molecular characterization of newly generated unmarked in-frame deletion and complementation mutants allowed defining ChnA (renamed here as Hped) as the enzyme responsible for 1-(4-hydroxyphenyl)-ethanol oxidation. Hped [1-(4-hydroxyphenyl)-ethanol dehydrogenase] belongs to the ‘classical' family within the short-chain alcohol dehydrogenase/reductase (SDR) superfamily. Hped was overproduced in Escherichia coli, purified and crystallized. The X-ray structures of the apo- and NAD+-soaked form were resolved at 1.5 and 1.1 Å, respectively, and revealed Hped as a typical homotetrameric SDR. Modeling of the substrate 4-hydroxyacetophenone (reductive direction of Hped) into the active site revealed the structural determinants of the strict (R)-specificity of Hped (Phe187), contrasting the (S)-specificity of previously reported 1-phenylethanol dehydrogenase (Ped; Tyr93) from strain EbN1 [Höffken et al: Biochemistry 2006;45:82-93].