Single-carbon catabolism in acetogens: analysis of carbon flow in Acetobacterium woodii and Butyribacterium methylotrophicum by fermentation and 13C nuclear magnetic resonance measurement.

Journal of Bacteriology
R KerbyJ G Zeikus

Abstract

The catabolism of methanol, formate, or carbon monoxide to acetate or butyrate or both was examined in two acetogenic bacteria. Butyribacterium methylotrophicum simultaneously transformed methanol and formate mainly to butyrate with concomitant H2 and CO2 production and consumption. In contrast, methanol plus CO was primarily converted to acetate, and only slight amounts of CO2 were produced. In vivo 13C nuclear magnetic resonance analysis of [13C]methanol transformation by B. methylotrophicum indicated that methanol was predominantly incorporated into the methyl of acetate. 13CO2 was produced and then consumed, and butyrate was formed from the condensation of two acetate precursors. The analysis of the position of acetate labeled by a given 13C single-carbon substrate when B. methylotrophicum or Acetobacterium woodii was grown in the presence of a second one-carbon substrate indicated two trends: when methanol was consumed, CO, CO2, or formate predominantly labeled the acetate carboxyl; when CO was consumed, CO2 and formate were principally funneled into the acetate methyl group, and CO remained a better carboxyl precursor. These data suggest a model of acetate synthesis via the combined operation of two readily reversible sin...Continue Reading

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