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MIP 300 Lecture Notes - Protoplast, Prokaryote, Peptidoglycan

Microbio, Immun, Pathology
Course Code
MIP 300
Erica Suchman

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30 January
Eubacteria cytoplasmic structures
Cytoplasmic matrix contained by plasma membrane
70% water, 30% enzymes, salt, lipids, nucleic acids etc.
Unlike eukaryotes, no lipid bilayer bound organelles
May contain storage vesicles, inclusion bodies
Not bound by lipid bilayer membranes, bound by membranes of protein, simple
lipid, or no membrane
Types of inclusions can be used to help characterize bacteria
Organic Inclusion Bodies
Glycogen granules: glucose, energy source
Cyanophycin granules: long chains of amino acids
Arginine and aspartic acid
Nitrogen storage
Carboxysomes: enzymes involved in CO2 fixation (CO2 → sugar)
Gas vacuole: small proteins
Trap gas, allow bacteria to float
Collapse to sink
Build new ones to float
Inorganic Inclusion Bodies
Metachromatic granules: store phosphate, used to promote nucleic acids and ATP
Magnetasomes: contain iron, align bacteria in Earth’s magnetic field
More food closer to surface
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