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Aerobic methane-oxidizing bacteria, or methanotrophs, play a crucial role in the global methane cycle. Their methane oxidation activity in various environmental settings has a great mitigation effect on global climate change. Alphaproteobacterial methanotrophs were among the first to be taxonomically characterized, nowadays unified in the  Methylocystaceae  and  Beijerinckiaceae  families. Originally thought to have an obligate growth requirement for methane and related one-carbon compounds as a source of carbon and energy, it was later shown that various alphaproteobacterial methanotrophs are facultative, able to grow on multi-carbon compounds such as acetate. Most recently, we expanded our knowledge of the metabolic versatility of alphaproteobacterial methanotrophs. We showed that  Methylocystis  sp. strain SC2 has the capacity for mixotrophic growth on H 2  and CH 4 . This mini-review will summarize the change in perception from the long-held paradigm of obligate methanotrophy to today’s recognition of alphaproteobacterial methanotrophs as having both facultative and mixotrophic capabilities.

Unexpected metabolic versatility among type II methanotrophs in the Alphaproteobacteria