What does Ara do in pGLO?
In the presence of arabinose, the AraC protein promotes the binding of RNA polymerase to the promoter, which causes transcription of the GFP gene into messenger RNA (mRNA), followed by the translation of this mRNA into GFP.
What is the purpose of the LB amp ARA plate?
LB/amp/ara (Luria Broth + ampicillin + arabinose): on which only transformed E coli grow. They do fluoresce as the arabinose in the medium causes the promoter to switch on the gene for GFP. The E coli starter culture and plasmid DNA have been freeze-dried. Both must be rehydrated.
What is +pGLO LB amp ARA?
LB/amp/+pGLO This plate will have E. coli bacteria on LB. agar to which ampicillin has been added. The +pGLO means that the bacteria may. have been transformed (if your technique is.
Why do we plate pGLO positive cells on LB without amp or ARA?
The (-) pGLO LB/amp plate shows that the starter culture does not grow on the LB/amp plate. Without this control one would not know if the colonies on the LB/amp (+) pGLO plate were really transformants. What color are the bacteria?
What component of the LB amp ARA media is selective?
The component of the LB/AMP/ARA media that is selective is the AMP.
Is pGLO a gene?
The pGLO plasmid contains a gene (bla or ampR) for a protein called β-lactamase, which hydrolyzes antibiotics that have a β-lactam ring and makes host cells resistant to compounds like ampicillin. Expression of the β-lactamase gene is constitutive (that is, transcription is always on) from its own promoter site.
Why does LB amp ARA glow?
+pGLO, LB/AMP/ARA: They were exposed to AMP and arabinose sugar, causing bacteria to grow with ampicillin resistance. Colonies glowed due to exposure to arabinose sugar and UV light.
Do the bacteria on the pGLO LB Amp contain the GFP gene?
1) The pGLO plasmid contains the gene for GFP and a gene for resistance to the antibiotic ampicillin. 2) pGLO also incorporates a special gene regulation system that can be used to control expression of the fluorescent protein in transformed cells.
Why do you only see bacterial colonies on the LB amp and LB AMP Ara plates whereas the LB plate has a lawn of bacterial growth?
= The LB plate has nothing in it to prevent every cell placed there from growing. Therefore, a lawn should form. In the + DNA plates, only the transformed cells would grow, thus forming colonies.
What does pGLO stand for?
PGLO
| Acronym | Definition |
|---|---|
| PGLO | Persian Gay and Lesbian Organization (now Iranian Queer Organization) |
Why was there no growth on the LB amp plate?
The LB/AMP -plasmid plate should show no growth because the bacteria have not been exposed to the plasmid with ampicillin resistance.