Lac Operon Model

                                                     Lac Operon Model         The mechanism of Lac Operon was first described by F.Jacob and J. Monad in 1961.        For this work they were awarded by Nobel Prize in 1965.According to this model, an  operon was defined as a ' unit of co-ordinate control of protein synthesis which consisted of an operator gene and structural gene.  The operator gene controls the activity of number of structural genes, while structural gene produce the protein by transcribing mRNA. The regulator gene is not a part of operon but it controls the operator gene by producing repressor molecule. Lac operon or Lactose operon in E.coli : It is an operon model proposed by F.Jacob and J.Monad to study the gene regulation mechanism in E.coli.   The mechanism of Lac operon and it's different  units are described below: 1) Structural Gene: These gene's  are directly associated withe the synthesis of cellular proteins.               These Ge