Research progress and prospect of mercury methylation in methanogens
Microbial transformation is the most important way to convert inorganic mercury to methylmercury.Among them,sulfate-reducing bacteria and iron-reducing bacteria are considered to be the primary mercury methylation microorganisms.In recent years,several studies have shown that methanogens also play an important role in mercury methylation.Methanogens are involved in the process of mercury methylation in a variety of environmental medias,including anaerobic sediments,freshwater,and soils,leading to the formation of methylmercury.In addition,more than 10%of inorganic mercury was converted to methylmercury by several methanogens in pure culture systems.Methanogens are crucial to the production of methylmercury.However,there is a lack of systematic summary of mercury methylation in methanogens.In this paper,the role of methanogens in mercury methylation was summarized from the perspectives of in situ environment,laboratory pure culture,and co-culture systems.Based on this summary,the possible mercury methylation pathways of methanogens and future research directions were proposed and discussed.It was suggested that the mercury methylation process may be functionally related to one-carbon metabolism.
NETL
NSTL
万方数据
