Ribose or V) in tRNAAla, tRNA; bacteria; 5-methylaminomethyl-2-thiouridine in bacterial tRNAGlu and 5-(methoxycarbonylmethyl)-2-

1 Ser and tRNAVal of




thiouridine (mcm5s2U) in tRNAGlu and tRNALys of fungi; or 5-(methoxycarbonylmethyl)uridine (mcm5U) in tRNAArg of fungi (see Fig. 3.3 for some of them). The presence of unmodified U has been demonstrated for one species of tRNAGly in several bacteria and for one of the

Inosine (I)

h2n h2n

Queuosine (Quo or Q)

Figure 3.3. Some modified nucleosides occurring in the first position of the tRNA anticodon.

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