1887

Abstract

is an aerobic ammonia-oxidizing bacterium that participates in the C and N cycles. utilizes CO as its predominant carbon source, and is an obligate chemolithotroph, deriving all the reductant required for energy and biosynthesis from the oxidation of ammonia (NH) to nitrite (). This bacterium fixes carbon via the Calvin–Benson–Bassham (CBB) cycle via a type I ribulose bisphosphate carboxylase/oxygenase (RubisCO). The RubisCO operon is composed of five genes, . This gene organization is similar to that of the operon for ‘green-like’ type I RubisCOs in other organisms. The gene encoding the putative regulatory protein for RubisCO transcription was identified upstream of . This study showed that transcription of genes was upregulated when the carbon source was limited, while , and other energy-harvesting-related genes were downregulated. responds to carbon limitation by prioritizing resources towards key components for carbon assimilation. Unlike the situation for genes, NH was not required for the transcription of the genes. All five genes were only transcribed when an external energy source was provided. In actively growing cells, mRNAs from the five genes in the RubisCO operon were present at different levels, probably due to premature termination of transcription, rapid mRNA processing and mRNA degradation.

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2004-06-01
2020-04-09
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