gen

• Set of structural genes with related functions that share a common promoter
• Genes are controlled by shared promoter
• Genes are transcribed together and produce a single mRNA

• Binds the operator in the operon of the structural genes
• Has its own promoter
• Encodes a protein that regulates transcription not considered an actual part of the operon, but it affects the operon function

• Encode proteins that are used in metabolism or biosynthesis
• Also includes those that encode proteins that play a structural role in the cell

• Genes whose products interact with other sequences and affect the transcription or translation of those sequences
• Products: RNA or proteins

• Part of regulatory genes
• Specialized proteins that bind to DNA sequences and affect their expression
• They have special motifs that facilitate binding to and altering DNA

• An operon required for the transport and metabolism of lactose in E. coli
• Consists of three structural genes: lacZ, lacY, lacA(i)

• The lac operon consists of three structural genes, a promoter, a terminator, regulator, and an operator
• Transcription of all genes starts with the binding of the enzyme RNA polymerase, a DNA binding protein, which binds to a specific DNA binding site, the promoter, upstream of the genes

• Sequences that are not transcribed but affect expression of sequences to which they are linked
• Not actually a gene

The repressor protein encoded binds to the lac operator and prevents transcription