(SAMDC) that exploit the electron-withdrawing power of the pyruvoyl group.
* Intramolecular transesterification, resulting in a branched polypeptide. In inteins, the new ester bond is broken by an intramolecular attack by the soon-to-be C-terminal asparagine.
* Intermolecular transesterification can transfer a whole segment from one polypeptide to another, as is seen in the Hedgehog protein autoprocessing.

History

The proposal that proteins were linear chains of ?-amino acids was made

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