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. 1975 Jun;72(6):2237–2241. doi: 10.1073/pnas.72.6.2237

Genetic analysis of the cell surface: association of human chromosome 5 with sensitivity to diphtheria toxin in mouse-human somatic cell hybrids.

R P Creagan, S Chen, F H Ruddle
PMCID: PMC432732  PMID: 1056028

Abstract

Diphtheria toxin inhibits protein synthesis in eukaryotic cells by catalyzing inactivation of elongation factor 2. The 10,000-fold greater sensitivity in vitro to diphtheria toxin of human cells as compared to mouse cells seems to be attributable to a difference at the level of the cell membrane. Mouse-human cell hybrids are as sensitive to diphtheria toxin as human cells. We have shown that the sensitivity of the hybrid cells is due to a gene or genes located on human chromosome 5. Mouse-human hybrid cells in which chromosome 5 is present are as sensitive to the toxin as human cells, which hybrids without chromosome 5 are as resistant as mouse cells. Entry of toxin into cells seems to be a two-step process involvin, (1) binding of toxin to the cell surface and (2) endocytotic uptake of toxin. The difference in sensitivity between human and mouse cells and between hybrid cells with and without chromosome 5 does not appear to be due to a difference in endocytotic activity and may be due to presence or absence of toxin-specific receptor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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