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. 1977 Jan;15(1):138–144. doi: 10.1128/iai.15.1.138-144.1977

Mechanism of action of Pseudomonas aeruginosa exotoxin Aiadenosine diphosphate-ribosylation of mammalian elongation factor 2 in vitro and in vivo.

B H Iglewski, P V Liu, D Kabat
PMCID: PMC421339  PMID: 188760

Abstract

Previous studies showed that Pseudomonas aeruginosa exotoxin A (PA toxin) catalyzes nicotinamide adenine dinucleotide (NAD)-dependent inhibition of protein synthesis in a rabbit reticulocyte lysate and transfer of radioactivity from [14C]adenine-labeled NAD to a protein having the same molecular weight as elongation factor 2 (EF-2) (B.H.Iglewski and D. Kabat, 1975). Such an inhibited protein-synthesizing lysate was restored to activity by addition of a protein from normal mouse liver which co-purifies with EF-2. In addition, EF-2 activity was almost totally absent in livers of mice which had been injected 24 h earlier with PA toxin. On the contrary, EF-2 concentrations were only partially reduced in other organs and were normal in brains of intoxicated mice. Studies using NAD labeled in various positions show that PA toxin, like fragment A of diphtheria toxin, catalyzes transfer of the adenosine 5'-diphosphate-ribosyl moiety of NAD. Furthermore, reversal occurred when the modified protein was incubated with excess concentrations of PA toxin and nicotinamide, and NAD was identified as a product of the reverse reaction. The protein modification catalyzed either by PA toxin or by fragment A of diphtheria toxin could be reversed by incubation with other toxin. These results support the proposal that these two toxins adenosine 5'-diphosphate-ribosylate and same amino acid of EF-2 in a stereochemically identical fashion. Furthermore, PA toxin inactivates EF-2 in intoxicated mice to an extent which would ultimately result in death.

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Selected References

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  1. ALLEN E. H., SCHWEET R. S. Synthesis of hemoglobin in a cell-free system. I. Properties of the complete system. J Biol Chem. 1962 Mar;237:760–767. [PubMed] [Google Scholar]
  2. Adamson S. D., Herbert E., Godchaux W. Factors affecting the rate of protein synthesis in lysate systems from reticulocytes. Arch Biochem Biophys. 1968 May;125(2):671–683. doi: 10.1016/0003-9861(68)90625-5. [DOI] [PubMed] [Google Scholar]
  3. Atik M., Liu P. V., Hanson B. A., Amini S., Rosenberg C. F. Pseudomonas exotoxin shock. A preliminary report of studies in dogs. JAMA. 1968 Jul 15;205(3):134–140. doi: 10.1001/jama.205.3.134. [DOI] [PubMed] [Google Scholar]
  4. Baseman J. B., Pappenheimer A. M., Jr, Gill D. M., Harper A. A. Action of diphtheria toxin in the guinea pig. J Exp Med. 1970 Dec 1;132(6):1138–1152. doi: 10.1084/jem.132.6.1138. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Bonventre P. F., Imhoff J. G. Studies on the mode of action of diphtheria toxin. I. Protein synthesis in guinea pig tissues. J Exp Med. 1966 Dec 1;124(6):1107–1122. doi: 10.1084/jem.124.6.1107. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Callahan L. T., 3rd Purification and characterization of Pseudomonas aeruginosa exotoxin. Infect Immun. 1974 Jan;9(1):113–118. doi: 10.1128/iai.9.1.113-118.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Collier R. J. Diphtheria toxin: mode of action and structure. Bacteriol Rev. 1975 Mar;39(1):54–85. doi: 10.1128/br.39.1.54-85.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Collier R. J., Kandel J. Structure and activity of diphtheria toxin. I. Thiol-dependent dissociation of a fraction of toxin into enzymically active and inactive fragments. J Biol Chem. 1971 Mar 10;246(5):1496–1503. [PubMed] [Google Scholar]
  9. Gill D. M., Dinius L. L. Observations on the structure of diphtheria toxin. J Biol Chem. 1971 Mar 10;246(5):1485–1491. [PubMed] [Google Scholar]
  10. Gill D. M., Dinius L. L. The elongation factor 2 content of mammalian cells. Assay method and relation to ribosome number. J Biol Chem. 1973 Jan 25;248(2):654–658. [PubMed] [Google Scholar]
  11. Honjo T., Nishizuka Y., Kato I., Hayaishi O. Adenosine diphosphate ribosylation of aminoacyl transferase II and inhibition of protein synthesis by diphtheria toxin. J Biol Chem. 1971 Jul 10;246(13):4251–4260. [PubMed] [Google Scholar]
  12. Iglewski B. H., Kabat D. NAD-dependent inhibition of protein synthesis by Pseudomonas aeruginosa toxin,. Proc Natl Acad Sci U S A. 1975 Jun;72(6):2284–2288. doi: 10.1073/pnas.72.6.2284. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Liu P. V. Exotoxins of Pseudomonas aeruginosa. I. Factors that influence the production of exotoxin A. J Infect Dis. 1973 Oct;128(4):506–513. doi: 10.1093/infdis/128.4.506. [DOI] [PubMed] [Google Scholar]
  14. Liu P. V., Yoshii S., Hsieh H. Exotoxins of Pseudomonas aeruginosa. II. Concentration, purification, and characterization of exotoxin A. J Infect Dis. 1973 Oct;128(4):514–519. doi: 10.1093/infdis/128.4.514. [DOI] [PubMed] [Google Scholar]
  15. Merrick W. C., Kemper W. M., Kantor J. A., Anderson W. F. Purification and properties of rabbit reticulocyte protein synthesis elongation factor 2. J Biol Chem. 1975 Apr 10;250(7):2620–2625. [PubMed] [Google Scholar]
  16. Pavlovskis O. R., Gordon F. B. Pseudomonas aeruginosa exotoxin: effect on cell cultures. J Infect Dis. 1972 Jun;125(6):631–636. doi: 10.1093/infdis/125.6.631. [DOI] [PubMed] [Google Scholar]
  17. Pavlovskis O. R., Shackelford A. H. Pseudomonas aeruginosa exotoxin in mice: localization and effect on protein synthesis. Infect Immun. 1974 Mar;9(3):540–546. doi: 10.1128/iai.9.3.540-546.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Pavlovskis O. R., Voelker F. A., Shackelford A. H. Pseudomonas aeruginosa exotoxin in mice: histopathology and serum enzyme changes. J Infect Dis. 1976 Mar;133(3):253–259. doi: 10.1093/infdis/133.3.253. [DOI] [PubMed] [Google Scholar]
  19. Vasil M. L., Liu P. V., Iglewski B. H. Temperature-dependent inactivating factor of Pseudomonas aeruginosa exotoxin A. Infect Immun. 1976 May;13(5):1467–1472. doi: 10.1128/iai.13.5.1467-1472.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]

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