Department of Bioresource Engineering, Faculty of Agriculture, Yamagata University.
Microbes Environ. 2008;23(2):118-27. doi: 10.1264/jsme2.23.118.
Acetate is one of the most important intermediates for methanogenesis in the anaerobic mineralization of organic materials. Methanogenic acetate degradation is carried out by either an aceticlastic reaction or an anaerobic acetate-oxidizing reaction. In contrast to the former reaction, the latter is energetically extremely unfavorable. However, the oxidation of acetate can occur with syntrophic interaction between certain bacteria and methanogenic archaea. The bacteria, namely syntrophic acetate-oxidizing bacteria, can oxidize acetate to produce hydrogen/CO(2) only when their products are subsequently utilized by the hydrogen-scavenging methanogens. Surprisingly, some of these bacteria can also axenically grow on hydrogen/CO(2) to produce acetate. This means that the bacteria can utilize both substrates and products reversibly. This review describes current studies of these curious and fascinating microbes.
乙酸盐是有机物质厌氧矿化过程中甲烷生成的最重要的中间产物之一。产甲烷菌可以通过乙酸裂解反应或厌氧乙酸氧化反应来降解乙酸盐。与前者反应不同，后者在能量上是极其不利的。然而，在某些细菌和产甲烷古菌之间的协同作用下，乙酸盐的氧化作用可以发生。这些细菌，即协同乙酸氧化细菌，只有当它们的产物被随后的氢扫掠产甲烷菌利用时，才能将乙酸盐氧化为氢气/二氧化碳。令人惊讶的是，其中一些细菌也可以在氢气/二氧化碳上异养生长并产生乙酸盐。这意味着这些细菌可以可逆地利用两种底物和产物。本文综述了目前对这些奇特而迷人的微生物的研究。
