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University of Groningen Terpenoid cell factory Abdallah, Ingy Ibrahim Ahmed Fouad

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University of Groningen

Terpenoid cell factory

Abdallah, Ingy Ibrahim Ahmed Fouad

IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below.

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Publication date: 2018

Link to publication in University of Groningen/UMCG research database

Citation for published version (APA):

Abdallah, I. I. A. F. (2018). Terpenoid cell factory. Rijksuniversiteit Groningen.

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STELLINGEN

Behorende bij het proefschrift

Terpenoid Cell Factory

van Ingy I. Abdallah

1. Over expression of the innate MEP pathway of Bacillus subtilis developed it into a promising cell factory for production of valuable terpenoids (This thesis).

2. Terpene synthases possess an intriguing catalytic mechanism and unraveling their structure-function relations is a challenging but exciting task (This thesis).

3. Computational modeling is a very useful tool for enzyme engineering; however it should go hand in hand with experimental results (This thesis).

4. Mutability landscape guided engineering provided insight into the mechanism of amorpha-4,11-diene synthase and opened the path for possibly improving production of the antimalarial artemisinin (This thesis).

5. A single amino acid substitution can have a great impact on the catalytic activity and product profile of amorpha-4,11-diene synthase (This thesis).

6. Metabolic engineering experiments are both frustrating and rewarding. 7. Cloning would have been an enjoyable task, if it can be physically

experienced as assembling LEGO.

8. I believe that the statement by Anatole France “To accomplish great things, we must not only act, but also dream; not only plan, but also believe” is the essence of research.

9. Limits exist only in the mind so don’t be afraid to push the boundaries and discover novel landscapes.

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This mechanism was illustrated in other terpene synthases where they experience a structural transition from open to closed active site conformation when the magnesium ions bind

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The objectives of the thesis by Ingy Abdallah are establishing the Gram- positive bacterium Bacillus subtilis as a platform organism for terpenoid production by understanding