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Published byDontae Diggle Modified over 10 years ago
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The Organelles: Mitochondria and Chloroplasts Text and image sources are included using the notes function of the.ppt file
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Endosymbiotic origins Unique unions reshaped the tree of life
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Architectural Clues Cyanobacterium Chloroplast
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A taste for the good life? Paramecium bursaria Mayorella viridis Prorodon viridis The promiscous green alga, Chlorella
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Cyanophora paradoxa Trying commitment...
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Reduced genomes remain Chloroplast genomes 200-120Kb encode about 80 proteins Mitochondrial genomes 16-17Kb encode about 20 proteins Chloroplast genomic reduction is still occurring in higher plants
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Relationships aren’t easy!
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Protein Import
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Mitochondrial Features Mitochondria are typically 0.5-5um in diameter
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A new slant on EM imaging
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Biochemistry
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Molecular Architecture
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Mitochondrial dynamics and biochemical diversity JC-1 stain Time-lapse 5 sec/frame; several minutes total Video
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Going with the flow Example from a hypha of the fungus Phycomyces Video
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Mitochondria revealed!
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Rapid fission and fusion In a Xenopus tissue culture cell In yeast Video
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Dynamin in mitochondrial division Yeast (wt) COS cells Dynamin- related protein::GFP Dynamin inhibition (B,D) results in the formation of reticulate networks Yeast COS cells
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Organelles and their genomes are inherited maternally And so are mutations encoded in the mitochondrial genome
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Apoptosis Cytochrome C::GFP is lost from mitochondria to the cytosol Video
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Plant cell Chloroplasts are typically 1-10um in diameter
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Chloroplast ultrastructure Double envelope Thylakoids and stacked grana Stroma Mitochondria Nucleus Starch grain
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Grana Freeze fracture of granal face Freeze etch of granal section Photosystem II particles stack grana
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Stromal tubule activity Video
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FtsZ in chloroplast division wt ftz
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Local chloroplast orientation to light in the green alga Mougeotia depends upon microfilaments and calcium Chloroplast movement Actin microfilament / myosin driven cytoplasmic streaming circulates plastids in many plant cells Video
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Other types of plastids
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