Bacterial structures Flashcards Preview

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Flashcards in Bacterial structures Deck (12):
1

Chemical composition:

  • Sugar bacbone with peptide side chains crosslinked by transpeptidase

Function:

  • Gives rigid stupport, protects against osmotic pressure

Define structure

Peptidoglycan

2

Chemical composition:

  • Peptidoglycan for support
  • Lipoteichoic acid induces TNF and IL-1

Function:

  • Major surface protein

Define structure

Cell wall/cell membrane (gram positives)

3

Chemical composition:

  • Lipid A induces TNF and IL-1 
  • O polysaccharide is the antigen

Function:

  • Site of endotoxin (lipopolysaccharide (LPS)) 
  • major surface antigen

Define structure

Outer membrane (Gram negative)

4

Chemical composition:

  • Phospholipid bilayer

Function:

  • Site of oxidative and transport enzymes

Define structure

Plasma membrane

5

Chemical composition:

  • 50 S and 30 S subunits

Function:

  • Protein syntheisis

Define structure

Ribosome

6

Chemical composition:

  • Contains many hydrolytic enzymes
  • including B-lactamase

Function:

  • space b/t the cytoplasmic membrane and out membrane in gram negative bacteria

Define structure

Periplasm

7

Chemical composition:

  • Polysaccharide (except Bacillus anthracis which contains D-glutamate)

Function:

  • Protects agianst phagocytosis

Define structure

Capsule

8

Chemical composition:

  • Glycoprotein

Function:

  • Mediate adherence of bacteria to cell surface
  • sex pilus forms attachement b/t 2 bacteria during conjucation

Define structure

Pilus/Fimbria

9

Chemical composition:

  • Protein

Function:

  • Motility

Define structure

Flagellum

10

Chemical composition:

  • Keratin-like coat
  • dipicolinic acid
  • peptidoglycan

Function:

  • Resistant to dehydration, heat and chemicals

Define structure

Spore

11

Chemical composition:

  • DNA

Function:

  • Contains variety of genes for antibiotic resistance, enyzmes, and toxins

Define structure

Plasmid

12

Chemical composition:

  • Polysaccharide

Function:

  • Mediates adherence to surfaces, especially foreign surfaces (e.g. indwelling catherters)

Define structure

Glycocalyx