t-RNA and aARs play together a very important role in translation.
selenocysteine and pyrrolysin are added into polypeptide chain by using stop codons. Each aaRS recognizes its particular amino acid & tRNAs coding for that amino acid.
Identity elements: tRNA domains recognized by an aaRS. Most identity elements are in the acceptor stem & anticodon loop.
There are 2 families of Aminoacyl-tRNA Synthetases: Class I & Class II.


#csirnet #selenocysteine

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