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virulence factors Flashcards

1
Q

elastin, collagen, fibronectin binding proteins; clumping factor

A

MSCRAMMs (S. aureus)

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2
Q

cleaves fibrin to fibrinogen to evade phagocytic cells

A

coagulase (S. aureus)

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3
Q

binds heavy chain Fc region of natibody (in reverse) to block opsonization

A

protein A (S. aureus)

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4
Q

multi-subunit pore forming cytotoxin

A

alpha toxin (S. aureus)

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5
Q

damages membrane in leukocytes, erythrocytes, fibroblasts; responsible for B hemolysis on BAP

A

beta toxin (S. aureus)

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6
Q

multi-subunit pore forming cytotoxin that effcets leukocytes

A

leukocidin (S. aureus)

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7
Q

quorum snesing sytem that determines what genes will be expressed based on cell density

A

AGR system (S. aureus)

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8
Q

loosens junctions of stratum granulosum resulting in sloughing off of top layer of dead keratinocytes (stratum corneum)

A

exfoliative toxin (S. aureus)

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9
Q

lancefield group A antigen

A

group specific carbohydrate (S. pyogenes)

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10
Q

allow attachment to host tissues

A

fimbriae (S. pyogenes)

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11
Q

binds fibronectin allowing for adherence to respiratory cells

A

F protein (S. pyogenes)

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12
Q

contributes to adhesion by binding fibronogem, inhibits C3b binding which inhibits complement binding, opsonization

A

M protein (S. pyogenes)

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13
Q

allows to be recognized as “self”

A

hyaluronic acid capsule (S. pyogenes)

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14
Q

protease that deactivates C5a so that it cannot attract phagocytic cells

A

C5a peptidase (ScpA) (S. pyogenes)

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15
Q

oxygen-stable, non-immunogenic, cytotoxin that disruots membranes of leukocytes, erythrocytes, platelets

A

Streptolysin S (S. pyogenes)

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16
Q

oxygen-labile, immunogenic pore forming cytotoxin, monomers bind cholesterol

A

Streptolysin O (S. pyogenes)

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17
Q

(S. pyogenes) act as superantigens (not all strains)

A

streptococcal pyrogenic exotoxins (SpeA-D) (S. pyogenes)

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18
Q

facilitate breakup of blood clots to allow for spread

A

Streptokinases (S. pyogenes)

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19
Q

(S. pyogenes) breakdown DNA to reduce viscosity of pus to allow for spread

A

Streptodornases (S. pyogenes)

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20
Q

(S. pyogenes) cleave hyaluronic acid in host connective tissue to facilitate spread

A

Hyaluronidase (S. pyogenes)

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21
Q

(S. pyogenes) break down cellular NAD+ which can lead to death via depletion or inhibition of immune system

A

NADase (S. pyogenes)

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22
Q

(S. pneumoniae) binds platelet active factor (PAF) receptors found on surfcae of endothelial cells, leukocytes, platelets, epithelial cells to allow bacteria to be transcytosed (apical to basolateral side for release)

A

phosphorylcholine (S. pyogenes)

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23
Q

(S. pneumoniae) host traps IgA in mucous and protease cleaves antibody to allow escape from mucous = capsule disruption, freeing phosphorylcholine to bind PAF receptors

A

IgA protease (S. pyogenes)

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24
Q

(S. pneumoniae) pore forming cytotoxin, binds host cell cholesterol and kills ciliated epithelial cells

A

pneumolysin (PLY) (S. pyogenes)

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25
Q

(S. pneumoniae) release cell wall techoic acids, phosphorylcholine in techoic acid allows for binding of PAF receptor, bound techoic acid is recognized by C3b to activate alternative complement pathway, increased inflammatory response and lysis results in tissue destruction

A

autolysins (S. pyogenes)

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26
Q

glycocalyx, made up of poly D glutamic acid; non-toxic on its own but necessary for organism to be pathogenic; prevents opsonization, complement activation

A

capsule (B. anthracis)

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27
Q

binds to receptors, cell surface furin cleaves into two subunits (83 > 63, 20); 63 multimerizes and interacts with EF or LF, once endocytosed low pH in endosome causes conformation change to allow pore formation, delivey of LF, EF to cytoplasm

A

protective antigen (PA) (B. anthracis)

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28
Q

Ca2+, calmodulin dependent AC, rapid efflux of fluid by increasing cAMP

A

edema factor (EF) (B. anthracis)

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29
Q

Zn2+ dependent metalloprotease, snips of n terminase of MAPK kinase - only affects macrophages, intereferes w/ cell signaling pathways, leads to apoptosis

A

lethal factor (LF) (B. anthracis)

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30
Q

protein products of 26 genes required for intracellular growth

A

Dot/ICM Type IV secretion system (L. pneumophila)

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31
Q

secreted through DOT/ICM system, not all required

A

Effector proteins (L. pneumophila)

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32
Q

interactions with each other and host Met trigger cell signaling events that promote cytoskeletal rearrangements, uptake

A

Internalins, E-cadherins (L. monocytogenes)

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33
Q

binds cholersterol and multimerizes in membrane to form pore and lyse phagosome

A

listeriolysin O (L. monocytogenes)

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34
Q

anchors on pole of cell to acitvte Arp2/3 comlex to induce formation of filaments that push listeria from infected to uninfected cell

A

ActA/F-actin (L. monocytogenes)

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35
Q

(M. tuberculosis) type of secretion system

A

Type VII

36
Q

suppresses T-cell activation, interferon induced expression of macrophage activation

A

lipoarabinomannan (M. tuberculosis)

37
Q

link mycolic acid to cell wall, potent antigens

A

Fbp A, B, C (M. tuberculosis)

38
Q

binds host cell heparin-binding epidermal growth factor, A subunit binds EF-2 altering it so it cannot interact with ribosome, inhibiting translation

A

diptheria toxin (C. diphtheriae)

39
Q

A subunti ADP-ribosylates alpha subnits of G proteins which inhibits recruitment of immune cells

A

pertussis toxin (B. pertussis)

40
Q

inhibits antigen presentation, proinflammatory cytokine release, complement mediated phagocytosis, immune cell recruitment by increasing cAMP levels

A

AC toxin (B. pertussis)

41
Q

facilitates attachment to ciliated epithelial cells

A

filamentous hemagglutinin (B. pertussis)

42
Q

inhibits cilia movement at low concentrations and kills ciliated epithelial cells at higher concentrations; sloughed dead cells contribute to thickening of mucous/ spread of bacteria

A

tracheal cytotoxin (B. pertussis)

43
Q

pilus that binds glycoprotein receptor on surface

A

colonizing factor adhesin (CFA) (ETEC)

44
Q

heat labile, AB enterotoxin that upregulates AC = cAMP up, H2O, Na2+, Cl- out of cell which results in electrolyte imbalance and watery diarrhea

A

LT-1 (ETEC)

45
Q

heat stable enterotoxin, upregulates GC = CGMP up, H2O, Na2+, Cl- out of cell which results in electrolyte imbalance and watery diarrhea

A

ST-a (ETEC)

46
Q

allows for aggregation of organisms to avoid phagocytosis

A

bundle forming pilus (BFP) (EPEC)

47
Q

inserts into cell membrane and binds bacterial protein intimin to induce pedestal formation which results in effacement of microvilli

A

Tir (EPEC, EHEC)

48
Q

disrupts tight junctions between cells leading to fluid loss, induces cell apoptosis

A

EspF (EPEC, EHEC)

49
Q

inhibits protein translations resulting in lysis of renal endothelial cells, RBCs, can lead to platelet activation, formation of blood clots, renal failure

A

Shiga toxin (EHEC, S. dysentariae)

50
Q

sequester iron

A

siderophores (UPEC)

51
Q

bind uroplakin receptor on superficial bladder cells to initiate cytoskeletal rearrangement, invasion of superficial bladder cells, activation of immune celsl

A

FimH (UPEC)

52
Q

(UPEC) resist phagocytosis and complement protein

A

capsule (K antigen) (UPEC)

53
Q

alpha, beta hemolysins

A

exotoxins (UPEC)

54
Q

chromosomal encoded pore-forming cytotoxin (only in certain strains)

A

ShET-1 (Shigella spp.)

55
Q

virulence plasmid encoded AB toxin - cAMP up, Cl-, Na2+, H2O out = electrolyte imbalance = watery diarhhea

A

ShET-2 (Shigella spp.)

56
Q

form pores in phagosome membrane to allow escape

A

IpaB/C (Shigella spp.)

57
Q

localizes to one pole to promote formation of filaments that propel bacteria through cell

A

IcsA (Shigella spp.)

58
Q

depolymerize microtubules in host cell

A

VirA (Shigella spp.)

59
Q

zinc endopeptidase that inhibits interaction of SNARE with vesicles containing excitatory neurotransmitter acetylcholine to prevent fusion with membrane

A

botulinum toxin (C. botulinum)

60
Q

zinc endopeptidase that inhibits interaction of SNARE with vesicles containing inhibitory neurotransmitter gamma-aminobutyric acid to prevent fusion with membrane

A

tetanus toxin (tetanospasmin) (C. tetani)

61
Q

glycotransferases that inactivate Rac, Rho, Cdc42 to depolymerize actin cytoskeleton, disrupt tight junctions, induce apoptosis

A

Tcd A/B (C. difficle)

62
Q

pathogenicity island required for intracellular multiplication in nonphagocytic intestinal epithelial cells

A

SP-1 (S. enterica ssp. enterica)

63
Q

pathogencity island required for formation of replicative vacuole

A

SP-2 (S. enterica ssp. enterica)

64
Q

phospholipase C, interacts with C-terminus of phosphatidylcholine, triggers conformational change that brings down N-term to cleave phsophatidylcholine, results in membrane damage leading to cell lysis

A

alpha toxin (C. perfringens)

65
Q

sequester iron from host binding proteins

A

Tbp A, B, Fbp A (N. gonorrheae, N. meningitis)

66
Q

blebs of this act as decoys for immune system

A

lipooligosaccharide (N. gonorrheae, N. meningitis)

67
Q

allow nutrient and waste exchange, act as adhesins, interfere with phagolysosome fusion, inhibit complement mediated killing

A

PorA/B (N. gonorrheae, N. meningitis)

68
Q

bind factor H to inhbit complement activation

A

factor H binding protein (fHbp) (N. gonorrheae, N. meningitis)

69
Q

allow for movement by twitching motility

A

pili (N. gonorrheae, N. meningitis)

70
Q

trancytose organism from apical to basolateral side to allow for extracellular multiplication

A

Opa (N. gonorrheae, N. meningitis)

71
Q

promotes survival on mucosal surface

A

IgA protease (N. meningitidis)

72
Q

fibronectin may be a receptor for attachment to host cells, complex with host antibodies resulting in destructive immune response in which fibronectin is recognized as foreign

A

virulence of T. pallidum

73
Q

contain RNA genome

A

matrix proteins (influenza, measles)

74
Q

coat RNA segments

A

nucleocapsid proteins (NP) (infleunza)

75
Q

facilitates release during budding

A

neuramidnidase (NA) (influenza)

76
Q

binds viral receptor (sialic acid) on host cell

A

hemagglutinin (influenza)

77
Q

nucleocapsid, inteacts with M protein

A

N protein (measles)

78
Q

prevents N from binding cellular RNA, tether viral polymerase to viral RNA-N complexes

A

D protein (measles)

79
Q

suppress host innate immune response by interefering w/ IFN signaling proteins

A

V, C proteins (measles)

80
Q

facilitates membrane fusion

A

F protein (measles)

81
Q

attachment of virions to host cell

A

hemagglutinin (measles)

82
Q

RNA-dependent RNA polymerase, caps and polyadenylates mRNAs for translation

A

L protein (measles)

83
Q

inhibits MAPK kinase signaling cascade

A

Yop J/P (Y. pestis)

84
Q

inhibits cytoskeletal rearrangement

A

Yop H (Y. pestis)

85
Q

adhesin, allows binding to collagen, fibronectin, mucous, inhbits complement binding

A

YadA (Y. pestis)

86
Q

antiphagocytic

A

proteinaceous capsule (F1, LcrV) (Y. pestis)

bms602 (8 decks)

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