Bacterial Transformation with (pGLO Plasmid) Lab #10: Molecular Biology
Purpose of this Lab • Learn how to insert a gene into bacteria (Heat Shock) • Analyze how a gene can transform an organism and express that gene • Provide evidence that bacteria can take in foreign DNA in the form of a plasmid • Reinforce the following process: DNA RNA Protein Trait • Observe how genes are regulated
Applications of Genetic Transformation • Used in many areas of Biotechnology • Agriculture (pests, frost, & drought) • Bacteria (oil spills) • Gene therapy (sick cells into healthy cells) • Medicine (produce insulin & hormones)
Key Terms to Know • DNA: Plasmid • Bacteria: E. coli (strain: HB101K-12) • Growth media: LB Broth (Luria & Bertani) • Ampicillin: Antibiotic kills bacteria “amp” • Arabinose: Sugar source for energy & carbon • Heat shock Process that increases permeability of the cell membrane to DNA • GFP: Green Fluorescent Protein (w/UV)
The Genes of Interest • Ampicillin resistance • Gene regulation proteins-activate the GFP gene when arabinose is present • GFP: Green Fluorescent Protein -originally isolated from the jellyfish: Aequorea victoria
Basic Process -Begin with “Starter” colonies of E. coli -Place a colony into each of the two tubes provided. labeled: -pGlo and +pGlo (yellow loop) -Add the pGlo plasmid to the +pGlo tube only (yellow loop) -Place tubes on ice (10 min) bottom of tubes should be exposed to the ice -Label the four plates as indicated in your guide -Heat Shock the tubes in water bath (50 sec.) -Return to the ice (2 min) -Add 250 L of LB broth to both tubes (sterile pipet each time) -Add 100 L of tube contents to the approriate plates -Spread the samples (w yellow loop) & tape all four plates together. Be sure your period and group name is clearly indicated.
The Process of Heat Shock • Helps to increase the bacterial uptake of foreign DNA • Membrane becomes more permeable to DNA • Time is essential: -ice water bath (42ºC) for 50 sec. ice • The number of transformants should increase
Using the Pipet Properly • Find the markings for each graduated volume on the pipet