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Anthranilate degradation by a cold-adapted Pseudomonas sp.

Dockyu Kim1, Miyoun Yoo, Eungbin Kim

  • 1Division of Life Sciences, Korea Polar Research Institute, Incheon, Korea.

Journal of Basic Microbiology
|May 31, 2013
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Summary

This study identifies a cold-adapted enzyme in alpine bacteria that degrades anthranilate. This enzyme is crucial for the bacterium

Keywords:
AromaticCold-adaptationDegradationThermolabile enzyme

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Area of Science:

  • Microbiology
  • Enzymology
  • Biochemistry

Background:

  • Alpine soils harbor unique microbial communities adapted to cold environments.
  • Pseudomonas sp. strain PAMC 25931 exhibits eurypsychrophilic characteristics, growing across a wide temperature range.
  • Anthranilate degradation is a key metabolic process in various environments.

Purpose of the Study:

  • To characterize the anthranilate degradation pathway in Pseudomonas sp. strain PAMC 25931.
  • To identify and analyze the enzymes involved in anthranilate metabolism.
  • To investigate the temperature-dependent activity of key enzymes, particularly catechol 1,2-dioxygenase (CatA).

Main Methods:

  • Genomic library construction and screening for degradative gene clusters.
  • Heterologous expression of genes in Escherichia coli.
  • Enzyme activity assays across a range of temperatures.
  • Comparative analysis of enzyme properties with mesophilic counterparts.

Main Results:

  • Two gene clusters, antABC and catBCA, responsible for anthranilate degradation, were identified and confirmed to be anthranilate-inducible.
  • Recombinant anthranilate 1,2-dioxygenase (AntABC) specifically converted anthranilate to catechol.
  • Recombinant catechol 1,2-dioxygenase (CatA) showed broad activity from 5-37°C but was thermolabile, rapidly losing activity above 25°C.

Conclusions:

  • Pseudomonas sp. strain PAMC 25931 possesses a unique anthranilate degradation system adapted to cold environments.
  • The cold-adapted, thermolabile nature of CatA suggests a specific adaptation to low-temperature conditions.
  • This enzyme likely contributes to the bacterium's ability to thrive and metabolize anthranilate in alpine habitats.