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structural gene - a gene that controls the production of a specific protein or peptide. suppresser gene, suppressor gene, suppresser, suppressor - a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene)
The lactose (lac) operon from Escherichia coli: z, y, and a are structural genes; i is the lac repressor gene; p is the promoter site; and o is the operator site. Activation is believed to arise from the binding of a protein immediately adjacent to the promoter. group of distinct genes that are expressed and regulated as a unit. Each operon is a deoxyribonucleic acid (DNA) sequence that contains at least two regulatory sites, the promoter and the operator, and the structural genes that code for specific proteins (see illustration).