An operon contains one or more structural genes which are generally transcribed into one polycistronic mRNA ( a single mRNA molecule that codes for more than one protein ).
22.
The most dreadful impact of NUMT insertion happens when the mtDNA is inserted into the regulatory region or nuclear structural genes and disrupts or alters the vital cell processes.
23.
However, Hg 2 + can bind to MerR and allosterically change the shape of the DNA so that RNA polymerase can read the promoter region of the structural genes.
24.
Since both promoter regions overlap, when apoMerR is bound to MerO, the change in DNA conformation causes neither the structural genes nor the regulatory genes to be read.
25.
Many of these organisms share the same structural genes for bodybuilding proteins like collagen and enzymes, but biologists had expected that each group of animals would have its own rules of development.
26.
Depending on the metabolic conditions, the attenuator either stops transcription at that point or allows read-through to the structural gene part of the mRNA and synthesis of the appropriate protein.
27.
The 3-4 structure is a transcription termination sequence, once it forms RNA polymerase will disassociate from the DNA and transcription of the structural genes of the operon will not occur.
28.
All the structural genes of an operon are turned ON or OFF together, due to a single promoter and operator upstream to them, but sometimes more control over the gene expression is needed.
29.
When the sequence of the beginning of the trp operon was determined an unusual open reading frame ( ORF ) was seen immediately preceding the ORFs for the known structural genes for the tryptophan biosynthetic enzymes.
30.
In addition, siRNA has been found to be successful in preventing the replication of the Tulane virus, part of the Caliciviridae family of viruses, by targeting both its structural and non-structural genes.
