Organization & Structure III

Organization & Structure III - Gas Vesicles Found in...

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Gas Vesicles Found in aquatic species Provide vertical motility Cyanobacteria, purple & green phototrophic bacteria
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Gas Vesicles Structure Hollow but rigid structures in cytoplasm Length: 45 – 120 nm X 300 to >1000 nm Few to hundreds per cell Protein membrane ~ 2 nm thick GvpA Hydrophobic 97% of membrane GvpC Minor component Reinforces membrane Vesicle permeable to gases but not water, solutes
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Gas Vacuoles
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Endospores Differentiated cells formed within the vegetative cell (sporangium) Highly resistant to heat, drying, radiation, acids, chemical disinfectants Bacillus , Clostridium Dormancy maintained for long periods
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Structure Exosporium: outermost layer, protein Spore coats: spore-specific proteins Cortex: loosely cross-linked peptidoglycan Core (spore protoplast): cell wall (core wall), cytoplasmic membrane, cytoplasm, nucleoid, etc. Dipicolinic acid: unique to spores
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This note was uploaded on 10/09/2010 for the course MCB 3020C taught by Professor Safranek during the Summer '10 term at University of Central Florida.

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Organization & Structure III - Gas Vesicles Found in...

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