Table 1: Kinetic and affinity constants for the interactions between the eL42 species and tRNA, rRNA, or the translation factors eRF1 and EF-3.

Proteins	Ligands	ka = kon (M-1.s-1)	kd = koff (s-1)	KD = kd/ka (M)
eL42	eRF1	5.3 x 103	1.99 x 10-4	3.75 x 10-8
Δ(GGQTK)	eRF1	1.56 x 102	4.87 x 10-4	3.12 x 10-6
eL42-Q51A/ Κ53Α	eRF1	2.34 x 102	3.79 x 10-4	1.62 x 10-6
eL42-Q51E	eRF1	1.31 x 102	2.51 x 10-4	1.92 x 10-6
eL42-K53Q	eRF1	1.47 x 102	1.88 x 10-4	1.28 x 10-6
eL42	EF-3	4.9 x 103	7.38 x 10-4	1.51 x 10-7
Δ(GGQTK)	EF-3	0.23 x 102	2.18 x 10-4	0.92 x 10-5
eL42	tRNA-Asp	1.5 x 106	2.3 x 10-3	1.5 x 10-9
Δ(GGQTK)	tRNA-Asp	5.89 x 104	2.89 x 10-4	4.9 x 10-9
eL42	rRNA	4.56 x 106	2.53 x 10-4	5.54 x 10-11
Δ(GGQTK)	rRNA	2.33 x 106	1.18 x 10-4	5.05 x 10-11