Bacterial Plasmids Loops of DNA found in some bacteria

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Presentation transcript:

Bacterial Plasmids Loops of DNA found in some bacteria Contains “special” genes that are not related to basic life functions i.e. antibiotic resistance Can be transferred from one bacterial cell to another Bacterial DNA Plasmid DNA

amp resistance ara B ara A ara D Plasmid from E. coli ara C O P Gene that codes for the inhibitor protein Operator for the arabinose operon. Gene that gives bacteria resistance to the antibiotic ampicillin. Promoter for the arabinose operon. Structural genes for arabinose metabolism

The Arabinose Operon in normal E. coli (for arabinose metabolism) Repressor protein (from ara C gene) O P ara B ara A ara D Structural genes (for arabinose metabolism) Regulatory genes (operator & promoter)

The Arabinose Operon in normal E. coli RNA polymerase O P ara B ara A ara D

The Arabinose Operon in normal E. coli ara A ara D

The Arabinose Operon in normal E. coli ara A ara D

The Arabinose Operon in normal E. coli ara A ara D

The Arabinose Operon in normal E. coli RNA polymerase Arabinose O P ara B ara A ara D

The Arabinose Operon in normal E. coli RNA polymerase Arabinose O P mRNA ara B ara A ara D

The Arabinose Operon in normal E. coli RNA polymerase Arabinose O P ara B ara A ara D mRNA