Off topic:Where Does Each Aars Classes Connect With The Trna?

Question

[Tal Galili]

Hello all,

I'm trying to understand to which "side" does the Aminoacyl tRNA synthetase connects to on the tRNA, dependent on it's class.

The wiki article states that:

• Class I [...] aminoacylates at the 2'-OH of an adenosine nucleotide.
• Class II [...] aminoacylates at the 3'-OH of the same adenosine.

Looking at the tRNA article, I can't seem to figure out where each of these two locations are (which letter number it refers to)

Thanks.