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Accurate translation of genetic information is crucial for synthesis of functional proteins in all organisms. We use recent experimental data to discuss how induced fit affects accuracy of initial codon selection on the ribosome by aminoacyl transfer RNA in ternary complex (T3) with elongation factor Tu (EF-Tu) and guanosine-5′-triphosphate (GTP). We define actual accuracy () of a particular protein synthesis system as its current accuracy and the effective selectivity (
) as
in the limit of zero ribosomal binding affinity for T3. Intrinsic selectivity (
), defined as the upper thermodynamic limit of
, is determined by the free energy difference between near-cognate and cognate T3 in the pre-GTP hydrolysis state on the ribosome.
is much larger than
, suggesting the possibility of a considerable increase in
and
at negligible kinetic cost. Induced fit increases
and
without affecting
, and aminoglycoside antibiotics reduce
and
at unaltered
.
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