The complete genome sequence of Roseobacter denitrificans reveals a mixotrophic rather than photosynthetic metabolism.

ABSTRACT: Purple aerobic anoxygenic phototrophs (AAPs) are the only organisms known to capture light energy to enhance growth only in the presence of oxygen but do not produce oxygen. The highly adaptive AAPs compose more than 10% of the microbial community in some euphotic upper ocean waters and are potentially major contributors to the fixation of the greenhouse gas CO2. We present the complete genomic sequence and feature analysis of the AAP Roseobacter denitrificans, which reveal clues to its physiology. The genome lacks genes that code for known photosynthetic carbon fixation pathways, and most notably missing are genes for the Calvin cycle enzymes ribulose bisphosphate carboxylase (RuBisCO) and phosphoribulokinase. Phylogenetic evidence implies that this absence could be due to a gene loss fro

SUBMITTER: Swingley WD 

PROVIDER: S-EPMC1797316 | biostudies-literature | 2007 Feb

REPOSITORIES: biostudies-literature