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A spectrophotometric trimethylamine monooxygenase assay
  • Gurunath Ramanathan,
  • Shiwangi Maurya,
  • Abhishek Singh
Gurunath Ramanathan
Indian Institute of Technology Kanpur Department of Chemistry

Corresponding Author:gurunath@iitk.ac.in

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Shiwangi Maurya
Indian Institute of Technology Kanpur Department of Chemistry
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Abhishek Singh
Indian Institute of Technology Kanpur Department of Chemistry
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Abstract

Trimethylamine monooxygenase ( Tmm, EC-1.14.13.148) belongs to the family of flavin-containing monooxygenases (FMOs) that oxidize trimethylamine into trimethylamine-N-oxide (TMAO). Conventional methods for assaying Tmm are accurate over a narrow range of substrate/ product concentrations. Here we report a TMAO-specific enzymatic assay for Tmm using polyallylamine hydrochloride (PAHCl)-capped MnO 2 nanoparticles (PAHCl@MnO 2). We achieved TMAO specificity using iodoacetonitrile to remove interfering trimethylamine. The change in the concentration of TMAO is measured by observing the difference in the absorbance of 3,3´,5,5´-tetramethylbenzidine (TMB) at 652 nm. The assay is tolerant to several interfering metal ions and other compounds. This method is more reliable and easier than currently known methods. The limit of detection (LOD) and limit of quantitation (LOQ) are 1 µM and 10 µM, respectively, for direct TMAO measurement.
30 May 2023Submitted to PROTEINS: Structure, Function, and Bioinformatics
31 May 2023Submission Checks Completed
31 May 2023Assigned to Editor
31 May 2023Review(s) Completed, Editorial Evaluation Pending
03 Jun 2023Reviewer(s) Assigned
21 Jul 2023Editorial Decision: Revise Major
06 Sep 20231st Revision Received
07 Sep 2023Submission Checks Completed
07 Sep 2023Assigned to Editor
07 Sep 2023Review(s) Completed, Editorial Evaluation Pending
07 Sep 2023Reviewer(s) Assigned
11 Sep 2023Editorial Decision: Accept