lariat structure

lariat structure

[ler′ē·ət]
a ring of intron segments that has been spliced out of a messenger ribonucleic acid molecule by enzymes. Some introns form a long tail attached to the ring, giving the structure the appearance of a microscopic cowboy lariat.
References in periodicals archive ?
In the splicing reaction, which occurs via two transesterification reactions, the branch site adenosine (A24) 2'-OH acts as a nucleophile and attacks at the 5'-phosphate on the intron site to form a lariat structure.