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Biochemistry (Moscow)

, Volume 75, Issue 12, pp 1435–1443 | Cite as

Cloning and characterization of indolepyruvate decarboxylase from Methylobacterium extorquens AM1

  • D. N. Fedorov
  • N. V. Doronina
  • Yu. A. TrotsenkoEmail author
Article

Abstract

For the first time for methylotrophic bacteria an enzyme of phytohormone indole-3-acetic acid (IAA) biosynthesis, indole-3-pyruvate decarboxylase (EC 4.1.1.74), has been found. An open reading frame (ORF) was identified in the genome of facultative methylotroph Methylobacterium extorquens AM1 using BLAST. This ORF encodes thiamine diphosphate-dependent 2-keto acid decarboxylase and has similarity with indole-3-pyruvate decarboxylases, which are key enzymes of IAA biosynthesis. The ORF of the gene, named ipdC, was cloned into overexpression vector pET-22b(+). Recombinant enzyme IpdC was purified from Escherichia coli BL21(DE3) and characterized. The enzyme showed the highest k cat value for benzoylformate, albeit the indolepyruvate was decarboxylated with the highest catalytic efficiency (k cat/K m). The molecular mass of the holoenzyme determined using gel-permeation chromatography corresponds to a 245-kDa homotetramer. An ipdC-knockout mutant of M. extorquens grown in the presence of tryptophan had decreased IAA level (46% of wild type strain). Complementation of the mutation resulted in 6.3-fold increase of IAA concentration in the culture medium compared to that of the mutant strain. Thus involvement of IpdC in IAA biosynthesis in M. extorquens was shown.

Key words

Methylobacterium extorquens indole-3-pyruvate decarboxylase heterologous expression kinetic properties mutants 

Abbreviations

IAA

indole-3-acetic acid

IAAld

indole-3-acetaldehyde

IAM

indole-3-acetamide

ILA

indole-3-lactic acid

IPyr

indole-3-pyruvic acid

ThDP

thiamine diphosphate

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • D. N. Fedorov
    • 1
  • N. V. Doronina
    • 1
  • Yu. A. Trotsenko
    • 1
    Email author
  1. 1.Skryabin Institute of Biochemistry and Physiology of MicroorganismsRussian Academy of SciencesPushchino, Moscow RegionRussia

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