Structure of RNA

 Structure of RNA 

1. The acceptor arm : This arm is capped with a sequence CCA (5′to 3′). The

amino acid is attached to the acceptor arm.

2. The anticodon arm : This arm, with the three specific nucleotide bases

(anticodon), is responsible for the recognition of triplet codon of mRNA. The

codon and anticodon are complementary to each other.

3. The D arm : It is so named due to the presence of dihydrouridine.

4. The TψC arm : This arm contains a sequence of T, pseudouridine

(represented by psi, ψ) and C.

5. The variable arm : This arm is the most variable in tRNA. Based on this

variability, tRNAs are classified into 2 categories :

(a) Class I tRNAs : The most predominant (about 75%) form with 3–5 base

pairs length.

(b) Class II tRNAs : They contain 13–20 base pair long arm.