1 Flashcards

1
Q

Specificité proteogly monde bacterien?

A

1/NacetylMuraminique
2/AA alterné D-Glu D-A en 2’ 3’
3/D ala D ala terminaux du precurseur
4/ AA diaminé en 3’

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2
Q

Etapes synthese paroi + ATB agissant a chaque etape

A

Cytoplasmique : synth dimere sucre-precurseur polypeptidique ==> Fosfomycine (MurA)
Cycloserine (Analogue D ala)
Membranaire : formation lipide I et II
Periplasmique/extraC : Reticulation via transglycosylases/transpeptidases= B lactamines (substrat suicide PLP)
+ AntiBK + Glycopeptides (Encombrement Dala Dala precurseur)

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3
Q

Modif/ PLP mosaique et espece bact

A

SARM PLP2a
Enterocoque : PLP5
Haemophilus : PLP3

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4
Q

Type molecule-action anti paroi

A

Dapto : lipopeptide cyclique
Colistine : polypeptide cyclique cationique

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5
Q

Type mole antimembrane

A

Dapto : lipopeptide cyclique
Colisitine : polypeptide cyclique cationique

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6
Q

Mecan Action Rifam

A

Empeche sortie brin ARN naissant ARN polyM

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7
Q

Mecanise R rifam-gene concerné

A

1- Mutation ARN poly RpoB : mutations compensatrice fitness en + et arrive a 10*9 inoc
2- Efflux Impermeabilité, rare

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8
Q

ATB anti Synthese acides nucl

A

Rifam FQ Bactrim Metronidazole Furanes

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9
Q

Mecanisme action FQ - genes

A

1/ inhib Gyrase (topo II ) gyr A gyr B
2/ inhib topo ss type IV ParC Par E

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10
Q

Resitance FQ

A

1/Mutation : touche GyrA en premier chez BGN: 3 paliers
2/ QNR : P QNR = protection cible = aug CMI moderee permettant Mutations
3/ Enz biF Aac 61 b cr
4/ Impermeabilité et efflux : R croisée Cyclines Blactamines

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11
Q

Mode action - R MetroniD

A

Detruit ADN en creant des ROS via metabolisation en ferredoxine
Resistance rare mutation

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12
Q

Mode action et R sulfamides

A

Inhibe synthese ac nucl via cycle folates: Dihydropteroate synthase= sulfameto Dihydrofolate reducatse= trimeto
R via modif cible mutation

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13
Q

R furanes et mode action

A

Idem MetroN

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14
Q

Mode action et R Linezolide

A

Action sur SU 50S ribosome a coté site MLSb, empeche action peptidyl transferase site A
R :
1/ enzyme methylation cible ARN23S, gene CFR +++ plasmidique, R depend du nombre de copies, R croisee MLSb
2/ Mutation chromosomique cible
3/ Proteines protection cible= proteines ABC-F, resitances croisees cyclines Tedizolide gene OptrA PoxtA

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15
Q

Mecanisme typage SA SE

A

1/ MLST
2/ Spa : proteine A: spéficique SA
3/Typage gene SCCmec
4/ Typage agr: gene regul accessoir

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