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. 1988 Aug 25;16(16):7817–7826. doi: 10.1093/nar/16.16.7817

Gene for the diphtheria toxin-susceptible elongation factor 2 from Methanococcus vannielii.

K Lechner 1, G Heller 1, A Böck 1
PMCID: PMC338492  PMID: 3419900

Abstract

Protein synthesis elongation factor 2 (EF-2) from all archaebacteria so far analysed, is susceptible to inactivation by diphtheria toxin, a property which it shares with EF-2 from the eukaryotic 8OS translation system. To resolve the structural basis of diphtheria toxin susceptibility, the structural gene for the EF-2 from an archaebacterium, Methanococcus vannielii, was cloned and its nucleotide sequence determined. It was found that (i) this gene is closely linked to that coding for elongation factor 1 alpha-(EF-1 alpha), (ii) the size of the gene product, as derived from the nucleotide sequence, lies between those for EF-2 from eukaryotes and eubacteria, (iii) it displays a higher sequence similarity to eukaryotic EF-2 than to eubacterial homologues, and (iv) the histidine residue which is modified to diphthamide and then ADP-ribosylated by diphtheria toxin is present in a sequence context similar to that of eukaryotic EF-2 but it is not conserved in eubacterial EF-G. The EF-2 gene from Methanococcus is expressed in transformed Saccharomyces cerevisiae but is not ADP-ribosylated by diphtheria toxin. This indicates that the Saccharomyces enzyme system is unable to post-translationally convert the respective histidine residue from the Methanococcus EF-2 into diphthamide.

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Selected References

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