pGLO Transformation LAB AP LAB 6
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Transcript of pGLO Transformation LAB AP LAB 6
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pGLO Transformation LABAP LAB 6
http://www.mshri.on.ca/nagy/GFP%20mice.jpg
BIO-RAD lab book
pGLOori
blaGFP
araC
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Aequorea victoria: Source of “glowing gene” for this experiment
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Jellyfish Gene put into Other CrittersJellyfish Gene put into Other Critters
http://www.technologyreview.com/files/21291/monkey_x600.jpg
http://www.lafuga.de/GFP_pig.jpg
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PLASMIDExtrachromosomal DNA
Often carry genes for antibiotic resistance
Can be passed from one bacterium to another
http://www.agen.ufl.edu/~owens/age2062/OnLineBiology/OLBB/www.emc.maricopa.edu/faculty/farabee/BIOBK/14_1.jpg
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Bacterial Transformation
Plasmids
Chromosomal DNA
Bacterial Cell
The uptake of DNA
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pGLO plasmid
bla (beta-lactamase)- On all time- Makes protein that breaks down ampicillin- Provides ampicillin resistance
GFP-Green Fluorescent Protein- Glows green in fluorescent light
ARABINOSE OPERON(INDUCIBLE)Turns on when arabinose sugar is presentAllows bacteria to digest this sugar
pGLOori
blaGFP
araCOri-PlasmidReplicationgenes
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ARABINOSE OPERON REGULATION
araC
RNA Polymerase
Effector (Arabinose)
B
B
B
A
A
A
D
D
D
araC
araC
ara Operon
INDUCIBLE OPERONPRESENCE OF ARABINOSE TURNS ON GENES TOMAKE ENZYMES TO DIGEST ARABINOSE
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pGLO Regulation
araC
RNA Polymerase
Effector (Arabinose)
B
B
B
A
A
A
D
D
D
araC
araC
ara Operon
GFP Gene
GFP Gene
GFP Gene
GFP GENE HAS BEEN ADDED TO ara OPERON
WHEN ARABINOSE IS PRESENT, OPERON IS TURNED ON andGFP GENEIS EXPRESSED TOO
Cells “glow” on mediawith arabinose
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Reasons for Each Transformation Step
CaCl2 treatment
Positive charge of Ca2+ ions neutralizes: • negative charge of DNA
phosphates • negative charge of
membrane phospholipids
Ca++
Ca++
OCH2
O
P O
O
O Base
CH2
O
P
O
O
O
Base
OH
Sugar
Sugar
OCa++
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Incubation on ice slows fluid cell membranes
Heat-shock increases permeability of cell membrane
Nutrient broth incubation allows beta lactamase expression
Reasons for Each Transformation Step
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Selection for plasmid uptake
• Antibiotic becomes a selecting agent– only bacteria with the plasmid will grow on
antibiotic (ampicillin) plate
LB/amp plateLB plate
all bacteria growonly transformed
bacteria grow
a
aa a
aa
aa
aa
aaa a
a
cloning
a a
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Transformation Results
All cells grow since there is no antibiotic on the plate
LB PLATELuria Broth
+
- PGLO = NO Plasmid
→
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Transformation Results
NO GROWTHCells without plasmid don’t have antibiotic resistance. Can’t grow on media with antibiotic added.
LB/AMP PLATELuria Broth with antibiotic
+
- PGLO = NO plasmid
→
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Transformation Results
LAWNCells with plasmid have antibiotic resistance gene so can grow on media with antibiotic
LB/AMP PLATELuria Broth with antibiotic
+
+ PGLO = Plasmid added
→
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Transformation Results
Cells with pGLO plasmid GROW & GLOW-can grow on media with antibiotic
GLOW on media with arabinose (turns on GFP gene)
LB/AMP/ARA PLATELuria Broth+ antibiotic|+ arabinose
+
+ PGLO = Plasmid added
→