Help:Tutorial:Step 6
From WikiPathways
Target genes are activated by the E-box element
After the Clock/Bmal1 dimer binds to the E-box element, transcription of several target genes are activated. This simplified version of the Circadian clock pathway, will restrict to the mPer/mCry genes, which will act as a negative feedback loop. As long as Per1 or Per2 exist as monomers, they will be phosphorylated by casein kinase 1 delta or epsilon, followed by degradation. In the pathway drawing we simplify it a bit by leaving out the phosphorylation event, resulting in the following representation:
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| Drawing the transcription of mPer/mCry and degradation of mPer |
1. Stack the mCry/mPer DataNodes
To illustrate that the mCry/mPer genes are activated by the E-box element, we can stack them below the 'Gene' label. Place the mPer/mCry DataNodes below the 'Gene' label and stack them in two vertical pairs, using the 
stack vertically button. Group each stacked pair.
2. Copy the gene-products
The genes will be translated into proteins, to show this on the pathway, copy the stacked genes and move them to the right of the stacked DataNodes.
3. Draw a line from the genes to the gene-products
To illustrate that the genes are translated into proteins, we draw a dashed arrow from each pair of genes to the copied pair. Connect the start and end points to the groups.
5. Create a degradation shape
As long as Per1 or Per2 is not dimerized with Cry1 or Cry2, it will be degraded. We can indicate degradation by using the degradation shape:
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You can find this shape in under Basic Shapes in the Objects Tab.
6. Draw an arrow from the mPer DataNodes to the degradation shape
To show that the mPer proteins are degraded, draw an dashed arrow from the two mPer DataNodes to the degradation shape. Connect the start of this line to group 2.1 to specify that only the mPer proteins are degraded.
