Definition of Repressor
The repressor is referred to such a protein that has the ability to turn off or down-regulate the expression of one or more than one gene and therefore, it is said that it has a negative influence on the expression of the genes. The formation of the molecule of messenger RNA is prevented as soon as the repressor molecule binds to the promoter region of the gene.
The transcription machinery is not allowed to assemble and hence the transcription of the DNA cannot be done. Due to the effect of such molecules, it is not possible for the liver enzymes to express RBCs and nerve cells to expression haemoglobin.
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