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Samenvatting inleidingsles practicum

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Samenvatting inleidingsles practicum Handig voor het practicumexamen

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Uploaded on
May 7, 2022
File latest updated on
May 8, 2022
Number of pages
11
Written in
2021/2022
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Examen biochemie
Experiment I : IC lokalisatie van succinaat dehydrogenase
Citroenzuurcyclus gebeurt in de mitochondriën




Succinaat dehydrogenase: succinaat -> fumaraat
FAD -> FADH2
uccinaat dehydrogenase
CooNa CooNa

CH2 CH

CH2 Complex II CH
Succinaat
dehydrogenase FADH2 CooNa
CooNa FAD
succinaat E fumaraat
E
Fe-S
Fe-S




1

, Experiment
ing van de SDH 1 SDH
activiteit in activiteit bepalenfracties
subcellulaire in subcellulaire fracties
-> via differentiële centrifugatie het homogenaat in verschillende fracties opsplitsen


!"#"$%&'(')"*++, ;',++0 &'(')"*++,
9"$*"*
-.//"$"*,.ë0" 1"*,$./2)+,." 1@,'>'0
(.,'1&'*-$.A*

3"4+0.*) #+*%-"%567%+1,.#.,".,


3"4+0.*) #+*%&",%-$''))"8.1&,
!"#$%&&%' ()'*%%' +,-&+,'

3"$"9"*.*) #+*%-"%567%+1,.#.,".,:%
µ)%;;<=)%8""/>"0=,.?->""*&".-




1. celfractionatie
• lever fijnknippen
• 20% homogenaat maken in buffer (pH 7,5) en 0,25M sucrose
o Buffer want de cellen mogen niet breken
• Potter hemogenisator: homogeniseren via Potter Elvejhem
o Cellen komen tussen stamper en glazen buis -> cellen gaan kapot en de organellen
blijven heel
• Weefsel steeds op ijs bewaren
o Proteases in de cel aanwezig (breken andere enzymes af)
o Oplossing; proteasen inhibitoren toevoegen of afkoelen

2. differentiële centrifugatie
• Hoe groter de partikel, hoe sneller de partikel neerslaat
• Organellen slaan neer bij verschillende g-kracht:
o Lage g-kracht: kernen gaan neerslaan (kern is groot en zal dus sneller neerslaan bij
kleien g)
o Hoge g-kracht: mitochondriën gaan neerslaan




3. enzym assay
Cofactor gebruiken om een kleurloos product (triphenyl tetrazolium chloride TTC)) om te zetten in
formazan vorm die rood is




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