An exit cavity was crucial to the polymerase activity of the early ribosome.

@article{Fox2012AnEC,
  title={An exit cavity was crucial to the polymerase activity of the early ribosome.},
  author={George E. Fox and Quyen Ha Tran and Ada Etil Yonath},
  journal={Astrobiology},
  year={2012},
  volume={12 1},
  pages={57-60}
}
The emergence of an RNA entity capable of synthesizing peptides was a key prebiotic development. It is hypothesized that a precursor of the modern ribosomal exit tunnel was associated with this RNA entity (e.g., "protoribosome" or "bonding entity") from the earliest time and played an essential role. Various compounds that can bind and activate amino acids, including extremely short RNA chains carrying amino acids, and possibly di- or tripeptides, would have associated with the internal cavity… CONTINUE READING
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