red layer microbial observatory biology 507 - in-lab ...red layer microbial observatory biology 507...
TRANSCRIPT
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Red Layer Microbial ObservatoryBiology 507 - In-Lab Workshop
Photosynthetic Microbes from Local Rivers & Beyond
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Schedule of Activities Session Two
1. Photosynthesis, Pigments, Archaea2. Pigment Analysis Set-Up3. Follow-Up - Last Week4. Curriculum Discussion/Essay
5. We may or may not have time for each person to use the fluorescence microscope.
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Oxygenic Anoxygenic
What is split? H2O H2S/H2
OrganismsPlants/Algae
Cyanobacteria
Purple BacteriaGreen BacteriaHeliobacteria
Major PigmentsChlorophylls
(shorter wavelenth)Bacteriochlorophylls(longer wavelengths)
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Photosynthetic Pigments
LocationSpecific proteins hold in membrane - nonpolarSpecies-specific proteins define real absorptionNaked pigment uses discrete value - e.g. 770Species-specific proteins alter - e.g. 800, 900Different methods for naked vs. protein-bound
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Chlorophylls (Chl) - OxygenicPlants - green a and b Algae - green a/b, gold/brown a/c, red a/dCyanobacteria - green a only
All of these, when excited by UV, “fluoresce” or emit light in the red or yellow range.
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Accessory Pigments - OxygenicCarotenes - yellow or red, WIDESPREADXanthophylls (brown), phycoerythrin (red)
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Bacteriochlorophylls (Bchl) - Anoxygenic Purple bacteria - Bchl aGreen bacteria - Bchl cHeliobacteria - Bchl g
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Accessory Pigments - AnoxygenicCarotenes - yellow or red, WIDESPREADPhycocyanin - blue, similar to phycoerythrin
Many chemotrophic pathogens have carotenes because these neutralize H2O2.
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Isolating Naked PigmentsBecause nonpolar, organic solvents involvedMethanol for research-grade work - GLOVESAcetone acceptable/available - harshBecause cell walls, you will pulverize sample Petroleum ether (jar/hood) - chromatographyData useful for major grouping assignments
A spectrophotometer allows one to skip chromatography.
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Isolating Protein/Pigments IN MembraneDisrupt cells using just pulverization - expensiveFragmented pigments called “in vivo”Data useful for grouping and species variation
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Archaeal “Photosynthesis” - Class By ItselfRemarkably, these are commercially available.
Why Unique?Bacteriorhodopsin (Brho) pigment in membraneLight causes Brho to physically move H+ outThis generates proton motive force - ATPaseNO ETC involved in this process
Brho homologous to eukaryotic rhodopsin.
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Halophiles5.5+ M salt - many different ions and pHEvaporation ponds, salt lakes, salted foodsHalobacterium = phototropic halophile
Many other Halophiles are not photosynthetic. They are simple chemotrophs.
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Photosynthesis and Evolution
Hot earth and the purple origin theoryAncient earth - 100°C but darkHeat gives off infrared - 900 nm or moreEmerging purple Bchl absorb this
Human eyes and salty Archaea - speculate all you want.
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What does the tree of life support?Green nonsulfur most ancient - purple membersPhototrophy evolved many timesChloroplast most similar to Cyanobacteria
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Pigment Analysis Set-Up
OverviewEach team will set up 2-3 different phototrophsYou will pulverize the sample in methanolExtract 15 minutes - ice/darkThen streak on chromatography paper, developAnd analyze the rest on a spectrophotometerShare class data - need all for web analysis
Analyze fluorescence data on web template.
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