N‐Terminal Methionine Processing

Paul T. Wingfield1

1 Protein Expression Laboratory, NIAMS/NIH, Bethesda, Maryland
Publication Name:  Current Protocols in Protein Science
Unit Number:  Unit 6.14
DOI:  10.1002/cpps.29
Online Posting Date:  April, 2017
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Protein synthesis is initiated by methionine in eukaryotes and by formylmethionine in prokaryotes. N‐terminal methionine can be co‐translationally cleaved by the enzyme methionine aminopeptidase (MAP). When recombinant proteins are expressed in bacterial and mammalian expression systems, there is a simple universal rule that predicts whether the initiating methionine will be processed by MAP based on the size of the residue adjacent (penultimate) to the N‐methionine. In general, if the side chains of the penultimate residues have a radius of gyration of 1.29 Å or less, methionine is cleaved. © 2017 by John Wiley & Sons, Inc.

Keywords: exopeptidase activity; methionine aminopepidases; N‐terminal methionine; protein synthesis

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Table of Contents

  • Background
  • Specificity
  • Recombinant Protein Expression
  • Acknowledgements
  • Literature Cited
  • Tables
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Literature Cited

Literature Cited
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