Photobacterium phosphoreum

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A Microbial Biorealm page on the genus Photobacterium phosphoreum


Higher order taxa

No rank: Cellular Organisms

Superkingdom: Bacteria

Phylum: Proteobacteria

Class: Gammaproteobacteria

Order: Vibrionales

Family: Vibrionaceae

Genus: Photobacterium

Species: Photobacterium phosphoreum


NCBI: Taxonomy

Proteobacterium phosphoreum

Description and significance

Photobacterium phosphoreum was first isolated from the aquatic environment in the late 1880’s by the Dutch microbiologist Martinus Beijerinck (1851-1931).[14] It is a Gammaproteobacteria which are Gram-negative, usually motile rods, are mesophilic and chemoorganotrophic, have falcultative fermentative metabolism and are found in aquatic habitats in association with eukaryotes.[14]

Photobacterium phosphoreum is one of many organisms that produce bioluminescence in marine organisms. P. phosphoreum is a light organ symbiont, living in the gut of the fish where metabolites are provided in exchange for bioluminescence, which is used for communication, prey attraction, and predator avoidance.[14] P. phosphoreum typical of deep sea fishes, which can also be found in dim and dark versions.[7] The gut of the fish, where P. phosphoreum is cultivated, is connected to some light organ on the fish which can be controlled with shutter apparatuses.[7] P. phosphoreum is psychrotolerant and often thrives in low temperatures but can be inhibited at temperatures above 25 degrees Celcius.[13, 15] Bioluminescence has been strongly linked to cell density, and bacteria living freely in the ocean are not bioluminescent as they are in the light organs of the host organism.[18]

P. phosphoreum also acts as the most important spoilage bacterium of packed chilled fish fillets. It enhances growth in packed fish products and causes the spoiled, fishy flavor.[13]

Genome structure

Describe the size and content of the genome. How many chromosomes? Circular or linear? Other interesting features? What is known about its sequence? Does it have any plasmids? Are they important to the organism's lifestyle?

Cell structure and metabolism

Describe any interesting features and/or cell structures; how it gains energy; what important molecules it produces.


Describe any interactions with other organisms (included eukaryotes), contributions to the environment, effect on environment, etc.


How does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.

Application to Biotechnology

Does this organism produce any useful compounds or enzymes? What are they and how are they used?

Current Research

Enter summaries of the most recent research here--at least three required


[Sample reference] Takai, K., Sugai, A., Itoh, T., and Horikoshi, K. "Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney". International Journal of Systematic and Evolutionary Microbiology. 2000. Volume 50. p. 489-500.

Edited by student of Rachel Larsen