lecture 3 - Outer Coverings Glycocalyx: network of...

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Outer Coverings • Glycocalyx: network of polysaccharides extending from cell surface – survival, attachment, virulence • Capsule: well organized glycocalyx; difficult to remove • S-layers – Gram positive bacteria – layers of protein or glycoprotein – Common among Archaea
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The S-layer.
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Periplasmic Space •Very small in G + ; much larger in G - (20 – 40% of total cell volume) •Contains enzymes that participate in nutrient acquisition and metabolism : e. g. exoenzymes
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Cell Attachment • Fimbriae and pili attach cells to surfaces – Thin filaments of protein “pilin” that extend from cell surface • Secretion Systems attach cells to host – Receptors for viruses – Conjugation – sex pili – Essential for bacterial pathogenicity • Stalks attach cells to surfaces – Extension of cell cytoplasm
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Flagella Peptidylglycan Cell membrane Outer membrane • Flagella – Long, helical protein filaments – Attached at ends, or over the whole cells • Flagella rotate to propel cell – clockwise or counterclockwise
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lecture 3 - Outer Coverings Glycocalyx: network of...

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