A motif found in RNA molecules, consisting of a structural cis-acting export element that comprises a double stranded stem (>14 nucleotides) with a base-paired 5' end and a 3-8 nucleotide protruding 3' end.
References in periodicals archive ?
A top-half tDNA minihelix is a good substrate for the eubacterial CCA-adding enzyme.
BARTEL: You're making the argument that because all these enzymes that recognize tRNA interact primarily with the top minihelix, that minihelix is therefore more ancient.
We believe that there is evidence that the lineage that produced the top-half minihelix of tRNA is ancient.