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.
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