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Samenvatting Carbonic anhydrase

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Inclusief: - Wat is het? - Wat doet het?: katalytische werking, doel,... - Reacties met stappenplan en uitleg - Visuele voorstelling - Snelheidsbepaling - Behapbaar en duidelijk

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Bespreek de katalytische werking van carbonic anhydrase.


 Enzym, anhydrase: zinkhoudend (Zn2+ in actieve site)
 Maakt snelle reactie nog sneller: 100 fold catalyst
 Verlaagt AE: metaalionkatalyse + zuur/base-reactie
 Voldoen aan snelheden om metabolische processen te onderhouden.
 Helpt CO₂ hydrateren (sneller: 0.0027 M-1sec-1) en HCO3- dehydrateren (trager:
50 sec-1) via katalyse van reactie:




CO2 + H2O H 2CO3 HCO 3- H+


 Katalyse: Zinkactivatie van H2O




Voor elke groep zijn
er 15,7 moleculen
H2O HO - HH₂O
+ diepK
niet
A = 15,7
(hydroxide-ion) gedissocieerd zijn.
- Zn2+-ion
 Positieve lading  stabiliseren negatieve lading op substraat
 Vormen sterke, maar kinetisch labiele bindingen
 Kunnen stabiel zijn in meerdere oxidatievormen.
- H2O
 pKA H2O = 15.7  H2O moeilijk deprotoneerbaar ( H20 ⇔ H+ + OH-)
 Binden van H2O met Zn2+ doet pkA verlagen naar 7




 Stappenplan
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