Which one of the following DOES NOT represent known interactions of RNA secondary structural elements?
Which one of the following DOES NOT represent known interactions of RNA secondary structural elements?
Select an option to attempt
Correct Answer: Option D
Explanation
RNA secondary structural interactions — identifying the non-RNA motif:Known RNA-RNA interaction motifs and secondary structural elements:• Pseudoknots: tertiary/secondary structure where a loop base-pairs with a region outside the stem, creating a knotted-like structure. Found in ribozymes, ribosomal RNA, telomerase RNA.• Kissing hairpins: Two hairpin loops base-pair with each other through complementary sequences in their loop regions. Important in HIV dimerisation and translational regulation.• Hairpin-bulge contacts: A hairpin loop makes tertiary contact with a bulge in another stem; common in ribosomal RNA.• Helix-turn-helix (HTH): A DNA-BINDING PROTEIN MOTIF (found in transcription factors, homeodomain proteins). NOT an RNA secondary structural interaction — it is a protein fold element.Answer: Helix-turn-helix is a DNA-binding protein motif, NOT an RNA secondary structural interaction.