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  • Description: hydroquinone-specific dioxygenase, confers resistence to methyl-hydroxyquinone

Gene name mhqA
Synonyms ykcA
Essential no
Product hydroquinone-specific dioxygenase
Function resistence to methyl-hydroxyquinone
Gene expression levels in SubtiExpress: mhqA
MW, pI 35 kDa, 5.404
Gene length, protein length 948 bp, 316 aa
Immediate neighbours steT, ykcB
Sequences Protein DNA DNA_with_flanks
Genetic context
YkcA context.gif
This image was kindly provided by SubtiList
Expression at a glance   PubMed
MhqA expression.png

Categories containing this gene/protein

resistance against oxidative and electrophile stress

This gene is a member of the following regulons

MhqR regulon

The gene

Basic information

  • Locus tag: BSU12870

Phenotypes of a mutant

Database entries

  • DBTBS entry: [1]
  • SubtiList entry: [2]

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity:
  • Protein family: extradiol ring-cleavage dioxygenase family (according to UniProt)

Extended information on the protein

  • Kinetic information:
  • Domains:
  • Modification:
  • Cofactor(s):
  • Effectors of protein activity:

Database entries

  • Structure: 3OAJ (MhqO, 34% identical residues)
  • KEGG entry: [3]
  • E.C. number:

Additional information

Expression and regulation

  • Regulation:
    • induced by catechol and 2-methylhydroquinone (MhqR) PubMed
  • Regulatory mechanism:
  • Additional information:
    • number of protein molecules per cell (minimal medium with glucose and ammonium): 183 PubMed

Biological materials

  • Mutant:
  • Expression vector:
  • lacZ fusion:
  • GFP fusion:
  • two-hybrid system:
  • Antibody:

Labs working on this gene/protein

Your additional remarks


Stefanie Töwe, Montira Leelakriangsak, Kazuo Kobayashi, Nguyen Van Duy, Michael Hecker, Peter Zuber, Haike Antelmann
The MarR-type repressor MhqR (YkvE) regulates multiple dioxygenases/glyoxalases and an azoreductase which confer resistance to 2-methylhydroquinone and catechol in Bacillus subtilis.
Mol Microbiol: 2007, 66(1);40-54
[PubMed:17725564] [] [DOI] (P p)

Van Duy Nguyen, Carmen Wolf, Ulrike Mäder, Michael Lalk, Peter Langer, Ulrike Lindequist, Michael Hecker, Haike Antelmann
Transcriptome and proteome analyses in response to 2-methylhydroquinone and 6-brom-2-vinyl-chroman-4-on reveal different degradation systems involved in the catabolism of aromatic compounds in Bacillus subtilis.
Proteomics: 2007, 7(9);1391-408
[PubMed:17407181] [] [DOI] (P p)