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The authors describe the role of Glu as an amino acid that "drags" the substrate.  this result is based upon MD simulations which occur on a nanosecond time scale. However, the catalytic activity of this enzyme is likely on the millisecond to second time scale. The authors need to provide better explanations (or provide explicit assumptions) to take into account the differences in time scale.
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Secondly, the term "drag" implies that this movement requires energy. The authors should indicate the amount of energy that is required to achieve such movement, and also indicate if this energy expenditure is compensated for by the formation of other enthlapic or entropic interactions. Finally, the term "drag" or "dragging" should be replaced with some other term like "movement" or "repulsion".  Again, "dragging" infers that the amino acid is in physical contact with the ribonucleotide, which it is not.
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