Research Highlights: New bacteria discovered in Southern California may be affiliating with cyanobacteria

New bacteria discovered in Southern California may be affiliating with cyanobacteria

  • Sediminibacterium is a member of Chitinophagaceae first described in 2008.
  • Sediminibacterium is a gram-negative bacterium and is closely related to Niabella and Terrimonas.
  • Sediminibacterium is motile and can be either obligate aerobes or facultative anaerobes.
  • A group of Southern California researchers led by Prof. Arun Sethuraman of San Diego State University and California State University San Marcos discovered the novel Sediminibacterium.
  • The discovery came after sequencing laboratory cultures of cyanobacteria from freshwater streams in Southern California.
  • The genome of Sediminibacterium that resides in the blue-green algal phycosphere was sequenced.
  • Phycosphere is a mucus region containing organic matter which surrounds a cyanobacterium.[1]
  • Microalgae secrete a sugary substance into the phycosphere which can be used by bacterial colonizers.
  • Analysis revealed an almost complete genome that was placed within sediminibacterial clades.
  • Results also revealed that the new bacteria may have genes involved in a mutualistic/commensal relationship with cyanobacteria.
  • The study helps understand the relationship between sediminibacteria and cyanobacteria, and the discovered genome may be utilized for future research.


Sethuraman, A., Stancheva, R., Sanders, C., Caceres, L., Castro, D., Hausknecht-Buss, H., Henry, S., Johansen, H., Kasler, A., Lastor, S., Massaro, I., Mekuria, I., Moron-Solano, A., Read, N., Vengerova, G., Zhang, A., Zhang, X., & Read, B. (2022). Genome of a novel Sediminibacterium discovered in association with two species of freshwater cyanobacteria from streams in Southern California. G3 (Bethesda, Md.), jkac123. Advance online publication.


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