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Holly Sewell 23 July 2010

Marine Bioluminescence. Holly Sewell 23 July 2010. Marine Bioluminescence. Experiment Organisms and Environments Where is it found? Function Proposed explanations Genes Reaction. www.ou.edu. www.ou.edu. Experiment : Can we isolate bioluminescent colonies?. SWC. SWC.

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Holly Sewell 23 July 2010

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  1. Marine Bioluminescence Holly Sewell 23 July 2010

  2. Marine Bioluminescence ExperimentOrganisms and EnvironmentsWhere is it found?FunctionProposed explanations Genes Reaction www.ou.edu www.ou.edu

  3. Experiment: Can we isolate bioluminescent colonies? SWC SWC

  4. Bacterial BioluminescenceWhere is it found? Vibrio Photorhabdus Estimated 1-6x103free-living bioluminescent bacteria per liter of water Some colonize light organs,producing light for animal for signaling avoiding predators attracting prey Parasites in crustacea Photobacterium www.alchemipedia.com www.asm.com www.bioart.co.uk

  5. Proposed explanation for bacterial bioluminescence Anaerobic bacteria may have developed bioluminescence to use up toxic oxygen (Tett & Kelley, 1973) Catalyze the transfer of electrons to oxygen (Nealson & Hastings, 1979) High population density quorum sensing: attract animals to feed  dispersal of population (Microbiology, Brock) Stimulation of DNA repair (Czyz et. al, 2000) www.pubs.acs.org

  6. Bioluminescence Genes AI AI AI AI AI AI AI AI AI AI Activation of luminescence genes AI lux I lux R

  7. Bioluminescence reaction:How it works Luciferin + O2 Oxyluciferin + Light RCOOH NAD(P)H + H+ Light ATP Oxidoreductase NAD(P)H + H+ AMP + PPi RCHO NAD(P)+ Fatty Acid Luciferase Reductase Luciferase NAD(P)+ O2 Luciferase FMNH2 + O2 + RCHO FMN + RCOOH + H2O + Light

  8. Questions?

  9. An Example of Bacterial BioluminescenceLight Organ colonization in Euprymnascolopes Colonized by Vibrio fischeri both light and presence important for development of squid www.ou.edu

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