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Samenvatting Microbiologie (Virologie - Schols)

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Volledige en overzichtelijk samenvatting op basis van de powerpoints met notities uit de les erin verwerkt. () - prof. Schols

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VIROLOGIE:
EIGENSCHAPPEN VIRUSSEN

- WAT?
o Obligate intracell molec parasieten
o Infectieus
o Niet met lichtmicroscoop waarneembaar




o Genoom:
▪ Ofwel DNA ss / dss, al dan niet gefragmenteerd
▪ Ofwel RNA
- EFFECT?
I. Inoculatie op celculturen
a. Cellen gaan samensmelten
b. Krijgen van gaten in structuur
II. Typisch cytopathogeen effect (CPE)
a. plaque vorming
b. syncytium vorming: cellen plakken samen & verdwijnen
III. Cel w doodgemaakt
- ANTIBIOTICA?
o NEEN! : virussen hier niet gevoelig voor (bacterien wel)
- VORM:
o Grootte = 500µm
o Bevat partikels erop = bacteriepartikel = 1000nm
o Partikel bevat virus = (grootte afh v welk virus)

ICOSAHEDRALE CAPSIDESTRUCTUUR

▪ Capsomeer nucleic acid zit hierin (genetisch DNA v virus)
▪ Capsiden beschermt DNA

Structuur:
= eicosaheder = 20 vlakken (gelijkzijdige driehoeken)
Voorbeelden: adenovirus, herpesvirus, picornavirus,…
Symmetrieassen:
▪ Icosahedrale structuur ve voetbal: pentons & hexons
▪ Belangrijk vr klassebepaling v virus
▪ #6hoeken kan enorm versch tss virussen
➔ Grotere virussen bevatten meer capsomeren
➔ #pentons = 12 altijd
➔ #hexons kan varieren

, HELICALE CAPSIDESTRUCTUUR




COMPLEXE CAPSIDESTRUCTUUR

ʟ Pokkenvirus enigste dat zo complex is
o Komt niet meer voor bij de mens

BACTERIOFAAG

ʟ = bacterie-infecterende virussen




Naakt icosahedraaal Poliovirus, adenovirus, hepatitis A virus
Naakt helicaal Tobacco mosaic virus (geen gekende humane
pathogenen)
Icosahedraal met enveloppe Herpes virus, HIV,gele koorts
Helicaal met enveloppe Rabies virus, influenza virus, parainfluenza virus, bof
virus, mazelen virus
Complex type Poxvirussen

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