Archaea oxidizing alkanes through alkyl-coenzyme M reductases

Area of Science:

• Microbiology
• Biochemistry
• Evolutionary Biology

Background:

• Recent discoveries reveal novel archaea clades capable of oxidizing higher alkanes.
• These organisms are termed anaerobic multicarbon alkane-oxidizing archaea (ANKA).

Purpose of the Study:

• Synthesize recent discoveries of ANKA.
• Discuss their metabolic pathways, evolution, and interactions with other microbes.
• Highlight research needs and biotechnological potential.

Main Methods:

• Review of recent scientific literature on alkane-oxidizing archaea.
• Analysis of metabolic pathways and evolutionary trajectories.
• Exploration of archaea-electron acceptor interactions, including with sulfate-reducing bacteria (SRB).

Main Results:

• Identification of novel archaea clades (ANKA) oxidizing alkanes from ethane to hexadecane.
• ANKA utilize alkyl-coenzyme M reductases, similar to those in methanogens and ANME.
• The alkane-oxidizing archaea group (ALOX) shows complex degradation pathways correlated with alkane chain length.
• Alkane oxidation is coupled with electron acceptor reduction, often involving SRB.

Conclusions:

• The polyphyletic ALOX group exhibits significant metabolic diversity and evolutionary innovation.
• Lateral gene transfer plays a role in the evolution of alkane degradation pathways.
• Understanding ALOX-SRB associations is crucial for comprehending microbial ecosystems.
• This field holds promise for future biotechnological applications.