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Figure 6 | Biology Direct

Figure 6

From: Amino acid fermentation at the origin of the genetic code

Figure 6

Pairs of tRNAs with complementary anticodons bearing Stickland-reactive amino acid pairs. (Only the anticodon sequences shown). The three associations shown correspond to both anticodon complementarities, and Stickland electron donor/acceptor pairs of amino acids: (A) Glycine is an electron acceptor, whilst alanine is a donor. (B) Aspartic acid is an electron acceptor in the presence of valine and (C) also on the presence of alanine. (D) A different codon for glycine associates with one from serine (an electron donor). (A), (B) and (D) are legitimate pairs, in the sense that the anticodon bases match according to Watson-Crick pairing. (C) is an illegitimate association, since it involves the U-G pair. The lines represent the pair types: three for G-C pairs, two for A-U pairs and one for U-G pairs. Gly: glycine, Asp: aspartic acid Ala: alanine, Ser: serine.

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