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| | = Introduction = | | = Introduction = |
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| - | LovTAP-VP16 is the name of the protein our light switch is based on. But it has never been expresed before and, therefore, there is no literature telling us under what conditions it works or whether it works at all.
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| - | == How LovTAP is thought to work ==
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| - | === Allosteric regulation ===
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| - | In a protein, generally an enzyme, an allosteric site is any part of the protein other than the active site.
| + | == How LovTAP is thought to work == |
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| - | Allosteric regulation of a protein consists in modifying its properties by interacting with an allosteric site.
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| - | One example would be the regulation in the tryptophan (trp) operon,
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| - | a group of genes studied in E. coli that are required for the synthesis of the amino acid tryptophan.
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| - | The expression of these genes can be blocked by the homodimeric protein tryptophan repressor
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| - | (TrpR), by binding the operator of the operon. TrpR repressing function is only active when
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| - | tryptophan is bound to its allosteric sites, i.e. it blocks the production of tryptophan when the
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| - | concentration of tryptophan is high.
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| - | === LovTAP ===
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| - | In a paper published in 2008 [http://www.pnas.org/content/105/31/10709.abstract], Strickland et al. propose to modify the protein TrpR such that
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| - | its activity can be controlled by light. This is done by fusing it to a light sensitive protein, the
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| - | plant phototropin LOV2 (Light-Oxygen-Voltage), whose sensitivity to blue light is conferred by the
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| - | ligand chromophore flavin mononucleotide (FMN). The fusion is done in a way that both domains
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| - | share a common α-helix, which would create a sort of lever that could transfer the conformational
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| - | changes in LOV2 when light-activated towards TrpR, triggering its activation.
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| - | ==== VP16 ====
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| - | [http://pubs.acs.org/doi/full/10.1021/bi0482912|Paper] stating that the part of VP16 we used (456-490) behaves as transcriptional activator.
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