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. 2007 Feb 20;104(9):3141–3146. doi: 10.1073/pnas.0611634104

Table 1.

Suppression efficiency of M. barkeri tRNAPyl variants

Mutations Suppression efficiency, %
Wild type
    Fusaro 100
    MS (C44U/A3G) 95
Discriminator base
    G73→C 88
    G73→A 33
    G73→U 43
Acceptor stem
    G1→A 26
    C72→U 30
    G1:C72→C:G 70
    G2:C71→A:U 52
    A3→G 58
    A5:U68→C:G 100
D-stem and loop
    U15→A 39
    G18→U 87
    U20→A 43
    A21→U 95
    G10:C25→U:A 50
    A11:U24→C:G 88
    U12:A23→G:C 112
    C13:G22→A:U 25
    Insert at G18 47
TψC-stem and loop
    U54→A 80
    A56→U 33
    A58→U 40
    U60→A 108
    C50:G64→A:U 79
    G51:C63→U:A 29
    G52:C62→U:A 63
    G53:C61→U:A 63
Variable loop
    C44→U 56
    A45→G 23
    G48→U 17
    Insert A at C44 17
Anticodon stem/loop
    A27:U43→G:A 56
    U29a→C 40
    Δ(U29aG41b) 12
    G29b:C41a→U:A 80
    G30:C40→ U:A 74
    A31:U39→C:G 46
    C32→A 31
    U33→G 16
    A37→C 13
    A38→C 49

Suppression efficiency was measured by β-galactosidase activity in E. coli strain XAC/A24. A percentage of 100 corresponds to 3,800 Miller units (13). In the absence of Cyc, background suppression in all cases was <5%.