A rapid fluorescence-based assay for detecting soluble methane monooxygenase

A. Miller, W. Keener, Maribeth E Watwood, F. Roberto

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A fluorescence-based assay was developed to estimate soluble methane monooxygenase (sMMO) activity in solution. Whole cells of Methylosinus trichosporium OB3b expressing sMMO were used to oxidize various compounds to screen for fluorescent products. Of the 12 compounds tested, only coumarin yielded a fluorescent product. The UV absorbance spectrum of the product matches that of 7-hydroxycoumarin, and this identification was confirmed by 13C-NMR spectroscopy. The dependence of the fluorescent reaction on sMMO activity was investigated by pre-incubation with acetylene, a known inhibitor of sMMO activity. Apparent kinetic parameters for whole cells were determined to be Km(app)=262 μM and Vmax(app)=821 nmol 7-hydroxycoumarin min-1 mg protein-1. The rate of coumarin oxidation by sMMO correlates well with those of trichloroethylene degradation and naphthalene oxidation. Advantages of the fluorescence-based coumarin oxidation assay over the naphthalene oxidation assay include a more stable product, direct detection of the product without additional reagents, and greater speed and convenience.

Original languageEnglish (US)
Pages (from-to)183-188
Number of pages6
JournalApplied Microbiology and Biotechnology
Volume58
Issue number2
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

methane monooxygenase
7-hydroxycoumarin
Assays
Methane
Fluorescence
Oxidation
Naphthalene
Application programs
Methylosinus trichosporium
Trichloroethylene
Acetylene
Kinetic parameters
Nuclear magnetic resonance spectroscopy
Magnetic Resonance Spectroscopy
Proteins
Degradation

ASJC Scopus subject areas

  • Biotechnology
  • Microbiology
  • Bioengineering

Cite this

A rapid fluorescence-based assay for detecting soluble methane monooxygenase. / Miller, A.; Keener, W.; Watwood, Maribeth E; Roberto, F.

In: Applied Microbiology and Biotechnology, Vol. 58, No. 2, 2002, p. 183-188.

Research output: Contribution to journalArticle

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