Efficient methanol-degrading aerobic bacteria isolated from a wetland ecosystem

Area of Science:

• Environmental microbiology
• Biochemistry

Background:

• Soil methylotrophs are crucial for regulating environmental one-carbon compounds.
• These microbes play a role in mitigating global warming through carbon cycling.

Purpose of the Study:

• To isolate and characterize methanol-degrading bacteria from the Kuttanad wetland ecosystem in India.
• To evaluate the methanol dehydrogenase enzyme activity and associated genes in isolated methylotrophs.

Main Methods:

• Isolation and identification of methylotrophic bacteria.
• Phylogenetic analysis using 16S rDNA sequences.
• In vitro enzyme activity assays and gene amplification/sequencing (mxaF, xoxF).

Main Results:

• Three methylotrophs were isolated: Achromobacter spanius KUT14, Acinetobacter sp. KUT26, and Methylobacterium radiotolerans KUT39.
• Methylobacterium radiotolerans KUT39 exhibited the highest methanol dehydrogenase specific activity (451.9 nmol min⁻¹ mg⁻¹).
• Achromobacter spanius KUT14 showed the lowest activity (50.15 nmol min⁻¹ mg⁻¹), marking the first report of methylotrophy in this species.

Conclusions:

• The study successfully isolated and characterized novel methylotrophs from the Kuttanad wetland.
• The findings highlight the significant potential of these bacteria in carbon cycling and environmental regulation.
• This research contributes to understanding microbial roles in mitigating global warming.