有效转录的基本条件 Groups of genes coding for related proteins are arranged in units known as operons. An operon consists of an operator, promoter, regulator, and structural genes. The regulator gene codes for a repressor protein that binds to the operator, obstructing the promoter of the structural genes. The regulator does not have to be adjacent to other genes in the operon. If the repressor protein is removed, transcription may occur. Promoter for regulatory gene Regulatory Structural loci gene I: Promoter for lac operon Operator: Structural: Structural Structural gene for gene for 阝- galact gene for sidase β- galactoside:β galactoside transacetylase 半乳糖苷酶 permease 渗透酶 ac。。er。n 转乙酰基酶有效转录的基本条件 Groups of genes coding for related proteins are arranged in units known as operons. An operon consists of an operator, promoter, regulator, and structural genes. The regulator gene codes for a repressor protein that binds to the operator, obstructing the promoter of the structural genes. The regulator does not have to be adjacent to other genes in the operon. If the repressor protein is removed, transcription may occur. 半乳糖苷酶 渗透酶 转乙酰基酶