The transfer of amino acid to tRNA
The amino acyl-AMP-enzyme complex, formed during the step outlined above, reacts with a particular tRNA and transfers the amino acid to the tRNA. This reaction is accompanied with the liberation of AMP and the enzyme. It should be noticed in this reaction that with AA1
, 1 is used as suffix to emphasize the specificity, which exists between them. A particular amino acid would require a particular enzyme and a particular species of tRNA. This would mean that for 20 amino acids, atleast 20 different enzymes and also atleast 20 different tRNA species would be required (while there are cases where more than one kind of tRNA may be available for the same amino acid, no cases are known, where the same tRNA can recognize two or more different amino acids).