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2015 | OriginalPaper | Hoofdstuk

2. Wat is metabolisme?

Auteur : Frans C. Schuit

Gepubliceerd in: Leerboek metabolisme

Uitgeverij: Bohn Stafleu van Loghum

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Samenvatting

Hoofdstuk 2 geeft een overzicht van metabolisme. Anatomisch is het een netwerk van paden, zoals het stratenplan van een stad, waarlangs het verkeer van moleculen (metabolieten) naar alle gewenste bestemmingen gaat. We onderscheiden katabolisme (de afbraak en verbranding van biomoleculen) van anabolisme (de opbouw van biomoleculen uit bouwstenen). Functioneel is metabole flux belangrijk: dit is de intensiteit van het metabolietenverkeer die overeen moet stemmen met de behoeften van het lichaam. Hierbij worden drie doelstellingen bereikt: het leveren van voldoende energie (ATP), het leveren van voldoende bouwstenen en het leveren van reducerend vermogen (NADPH) voor reductieve biosynthese. Belangrijk is dat de metabole flux geregeld wordt tot het gewenste niveau. Dit gebeurt dankzij flux-controlerende enzymen waarvan het aantal of de activiteit kan veranderen door de inwerking van hormonen op de cel. In dit verband bekijken we aangeboren ziekten van het metabolisme (inborn errors of metabolism) die niet alleen de flux verstoren, maar ook metabolieten kunnen doen opstapelen.
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Metagegevens
Titel
Wat is metabolisme?
Auteur
Frans C. Schuit
Copyright
2015
Uitgeverij
Bohn Stafleu van Loghum
DOI
https://doi.org/10.1007/978-90-368-0620-6_2