Real-time monitoring of ammonia-oxidizing activity in a nitrifying biofilm by amoA mRNA analysis

Y. Aoi, Y. Shiramasa, S. Tsuneda, A. Hirata, A. Kitayama, T. Nagamune

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ammonia monooxygenase encoding mRNA (amoA mRNA) transcription in the wastewater treatment process was investigated using reverse transcription PCR (RT-PCR) as the model indicating specific function and activity in nitrifying processes. The dynamic response of amoA mRNA transcription and ammonia-oxidizing activity to the change of environmental conditions such as pH and concentration of ammonia was examined to determine the inductive factor and the inhibitor for amoA mRNA expression. Furthermore, we semiquantitatively investigated the response of amoA mRNA transcription to the pH fluctuation in a continuous fed nitrifying reactor. As a result, amoA mRNA oriented analysis enabled real-time assay of ammonia-oxidizing activity within 2 h as a response time. In contrast, rRNA and amoA encoding DNA were constantly detected at almost the same amount throughout the experiment. mRNA transcription was regulated by the many environmental conditions: ammonia seems to be one of the strong inducers for transcription of amoA mRNA, whereas low pH seems to be a strong inhibitor. These factors simultaneously affected the mRNA transcription and enzymatic activity leading to the complex phenomena of ammonia-oxidizing activity and amoA mRNA transcription in the continuous feeding reactors.

Original languageEnglish
Pages (from-to)439-442
Number of pages4
JournalWater Science and Technology
Volume46
Issue number1-2
Publication statusPublished - 2002 Sep 12

Keywords

  • Ammonia-oxidizing activity
  • Biofilm
  • Nitrification process
  • RT-PCR
  • amoA mRNA

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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    Aoi, Y., Shiramasa, Y., Tsuneda, S., Hirata, A., Kitayama, A., & Nagamune, T. (2002). Real-time monitoring of ammonia-oxidizing activity in a nitrifying biofilm by amoA mRNA analysis. Water Science and Technology, 46(1-2), 439-442.