The Difference Between Porcelain Insulators And Pin Insulators

Some enhancers are located upstream of the promoter, while others are located downstream, so the effect of composite suspension insulator does not depend on the relative position of polymer suspension insulator to the promoter. Therefore, the reason for the directionality of the effect of suspension type insulator has not been really clarified. At present, two loci have been found to affect the function of composite tension insulator in a trans-activation manner. The nuclear protein encoded by the gene S2J (Hw) recognizes high voltage transmission line insulators and overhead power line insulators and has an insulating effect only after binding to it. When this gene mutates, although tension insulator is inserted into the y locus, it loses its insulating effect and y is expressed in all tissues. Another locus is mod (mdg 4). After the gene mutates, its effect is exactly the opposite of Su (Hw), that is, these mutants all enhance the insulating effect, so that the insulating effect of the insulator is no longer directional but is expanded, that is, the effect of the enhancers on both the upstream and downstream sides is blocked. One explanation is that Su (Hw) first binds to the insulator DNA, which makes the insulator have an insulating effect. When mod(mdg4) combines with Su(Hw), the insulator loses its insulating effect; the mutated mod(mdg4) cannot combine with Su(Hw), so the insulator enhances its insulating effect.