'Repressible' diaporamas de présentation

Molecular Mechanisms of Gene Regulation: The Operon (Ch7)

Molecular Mechanisms of Gene Regulation: The Operon (Ch7). Operon - set of genes that are coordinately controlled by a regulatory protein AND transcribed as a single polycistronic message.

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Regulation of Gene Expression

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How and Why Genes Are Regulated

How and Why Genes Are Regulated. Four of the many different types of human cells: They all share the same genome. What makes them different?. Gene Expression. Genes are expressed as traits Traits are proteins or result from reactions which are regulated by proteins, such as enzymes.

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Gene Regulation

Gene Regulation. Remember! All of your cells contain the exact same DNA. Your nerve cells do not look like or act like skin cells, so do they use the same genes? NO!. Gene Regulation. Genes are to be turned on/off based on whether they will be used or not!

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Operons

Operons. Big picture. Prokaryotic control of genome expression 2 levels of control Change in # of enzyme molecules produced Change in activity of enzymes present Ex: feedback inhibition Genes turned on/off based on metabolic needs: operons Operator + promoter + group of genes

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Gene Expression

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Operons: Bacterial Gene Control

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Regulation of gene expression in prokaryotes

Regulation of gene expression in prokaryotes. Katalin Kiss Dept. of Medical Biology 12.11. 2007. Gene expression in prokaryotes. Types of expression: Constitutive expression (eg. genes of glucose utilizing enzymes) Regulated expression induction (eg. genes of catabolic enzymes)

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Prokaryotic Gene Regulation:

Prokaryotic Gene Regulation:. Lecture 5. Introduction. The two types of transcription regulation control in prokaryotic cells The lac operon an inducible regulatory feedback system The tryp operon a repressible regulatory feedback system. The role of bioinformatics analysis in such systems.

398 views • 14 slides