Lesson 10-11 Gene Regulation in Bacteria and Bacteriophages.ppt

Lesson 10-11 Gene Regulation in Bacteria and Bacteriophages.ppt

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Unformatted text preview: BIO 325 Genetics Lectures 10 and 11 Gene Regulation in Bacteria and Bacteriophages Ta Yu Possession in Great Measure The most valuable possessions are equanimity, modesty, and inner independence. With these you can travel anywhere and meet with good fortune. The I Ching Gene Regulation in Bacteria and Bacteriophages Gene Regulation in Bacteria and Bacteriophages Gene regulation means that the level of gene expression can vary under different conditions. Gene Regulation in Bacteria and Bacteriophages Gene regulation means that the level of gene expression can vary under different conditions. Unregulated genes, which have constant levels of expression, are called constitutive genes. Gene Regulation in Bacteria and Bacteriophages Gene regulation means that the level of gene expression can vary under different conditions. Unregulated genes, which have constant levels of expression, are called constitutive genes. The majority of genes are regulated. Gene Regulation in Bacteria and Bacteriophages Gene regulation means that the level of gene expression can vary under different conditions. Unregulated genes, which have constant levels of expression, are called constitutive genes. The majority of genes are regulated. The processes of metabolism, response to environmental stress, and cell division are all regulated processes in the cell. Regulation may occur at any stage of gene expression. Gene Regulation in Bacteria and Bacteriophages Transcriptional Regulation Transcriptional regulation involves the actions of regulatory proteins that bind to the DNA and affect the rate of transcription. Transcriptional Regulation Transcriptional regulation involves the actions of regulatory proteins that bind to the DNA and affect the rate of transcription. Repressors inhibit transcription, which is called negative control. Transcriptional Regulation Transcriptional regulation involves the actions of regulatory proteins that bind to the DNA and affect the rate of transcription. Repressors inhibit transcription, which is called negative control. Activators increase transcription, which is called positive control. Transcriptional Regulation Effector molecules do not interact directly with the DNA, but rather directly with the repressors or activators. Transcriptional Regulation Effector molecules do not interact directly with the DNA, but rather directly with the repressors or activators. This usually results in a conformational change in the activator or repressor. Transcriptional Regulation Inducers are effector molecules that cause an increase in transcription. Genes that are regulated in this manner by inducers are called inducible. Transcriptional Regulation Inducers are effector molecules that cause an increase in transcription. Genes that are regulated in this manner by inducers are called inducible....
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Lesson 10-11 Gene Regulation in Bacteria and Bacteriophages.ppt

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