Lecture 8 - Innate Immunity and Bacteria Flashcards

1
Q

Pathogens detected by TLR 1/2 and 2/6

A

Bacteria, mycobacteria, fungi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which bacteria have LPS?

A

Gram -

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which part of a bacterial cell wall gives resistance to many proteolytic enzymes?

A

D-isoform of amino acids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where is peptidoglycan in G- bacteria?

A

Periplasmic space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Structure of peptidoglycan

A

1) N-acetylmuramic acid
2) N-acetylglucosamine
3) N-acetylmuramic acids linked by 4 amino acid oligopeptide chains

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the oligopeptides in peptidoglycan made up of?

A

D- and L- amino acids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does lysozyme degrade?

A

Polysaccharide bond between N-acetylmuramic acid and N-acetylglucosamine in peptidoglycan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Typical G+ genera

A

Streptococcus, staphylococcus, bacillus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Thickness of peptidoglycan in G+ bacteria

A

20 - 80nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Acidic polysaccharides in G+ peptidoglycan
1)
2)

A

1) Teichoic acid - Polymer of ribitol or glycerol and phosphate
2) Lipoteichoic acid - teichoic acid linked to lipids in cell wall

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Typical Gram- genera

A

Salmonella, Escherichia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Typical width of periplasmic space

A

20 - 70nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
Composition of G- outer membrane
1)
2)
3)
4)
A

1) Protein (EG: porins)
2) Lipoprotein
3) Phospholipid
4) Lipopolysaccharide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Proportion of G- outer membrane that is lipid

A

15%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Part of LPS that is toxic

A

Lipid A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Most conserved part of LPS

A

Lipid A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Most variable part of LPS

A

O-specific polysaccharide

18
Q

Major parts of LPS
1)
2)
3)

A

1) Lipid A
2) Core polysaccharide
3) O-specific polysaccharide

19
Q

What determines whether LPS is smooth or rough?

A

Smooth - long chain O-specific polysaccharide

Rough - short chain O-specific polysaccharide

20
Q

Result of excess lipid A in the blood

A

Raised temperature

Fever - septic shock, endotoxic shock

21
Q

Molecule used to serogroup bacteria

A

O-specific polysaccharide

22
Q

TLR activated by cell wall components

A

TLR1, 2, 4, 6

23
Q

Examples of bacteria that stain Gram negative, but are Gram positive

A

Mycobacterium, Nocardia

24
Q

Bacterium that lacks a cell wall

A

Mycoplasma

25
Composition of glycocalyx in bacteria
Usually polysaccharide | Can be polypeptide, or both
26
Capsule glycocalyx structure
ORganised, repeating units attached to cell surface
27
Slime layer glycocalyx structure
Loose, water-soluble structure
28
``` Function of capsules and slime layers 1) 2) 3) 4) 5) ```
1) Prevent dessication 2) Prevent phagocytosis 3) Prevent opsonisation 4) Promote biofilm formation 5) Promote adhesion
29
Which type of pathogenic bacteria often have glycocalyces?
Blood-borne pathogens
30
How is a bioflim on the teeth formed? 1) 2)
1) Bacteria attach to salivary proteins on tooth surface | 2) Provides anaerobic environment for bacteria to flourish
31
Parts of a prokaryotic flagellum 1) 2) 3)
1) Filament 2) Hook 3) Basal body
32
Type of bacteria with sialic acid-rich capsule
Neisseria meningitidis type B
33
Prokaryotic movement patterns 1) 2)
1) Runs - Straight lines | 2) Tumbles - Rapid, abrupt changes in direction
34
What is H type?
Type of flagellum that a bacteria has
35
Organisation of E. coli flagella
Multiple lateral flagella
36
Organisation of Vibrio flagella
Single polar flagellum
37
Organisation of T. pallidum flagella
Periplasmic flagella | Flagella are located in periplasmic space, 'vibrate' bacteria
38
How conserved are flagella?
Very | TLR5 detects many types of flagella
39
Subunit making up filament of flagella
Flagellin
40
Structure of pili
1) Rod-shaped, hollow cylinder 2) Helical array of pilin protein subunits 3) Pilus tip mediates adhesion - can be pilin or another protein
41
What is tissue tropism?
Tip of pilus determines tissue specific adhesion