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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Identification of unusual replacement of methionine by norleucine in recombinant interleukin-2 produced by E. coli.

Moderate amounts of norleucine incorporation into recombinant interleukin-2 (IL-2) produced in E. coli have been detected. Incorporation of norleucine occurs both at the amino terminal and internal methionines as confirmed by the isolation of norleucine-containing tryptic peptides which eluted later than the respective methionine-containing peptides by reverse-phase HPLC. The occurrence of norleucine in intact protein and modified peptides was determined by amino acid analysis and amino acid sequencing including Edman degradation and fast atom bombardment mass spectrometry. In the subsequent paper, we determined that norleucine incorporation is caused by the endogenous synthesis of norleucine in E. coli.[1]

References

  1. Identification of unusual replacement of methionine by norleucine in recombinant interleukin-2 produced by E. coli. Lu, H.S., Tsai, L.B., Kenney, W.C., Lai, P.H. Biochem. Biophys. Res. Commun. (1988) [Pubmed]
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