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• W1505124506 abstract "Pseudomonas aeruginosa exotoxin A (ETA) is an ADP-ribosyltransferase which inactivates protein synthesis by covalently attaching the ADP-ribose portion of NAD+ onto eucaryotic elongation factor 2 (EF-2). A direct biochemical comparison has been made between ETA and a nonenzymatically active mutant toxin (CRM 66) using highly purified preparations of each protein. The loss of ADP-ribosyltransferase activity and subsequent cytotoxicity have been correlated with the presence of a tyrosine residue in place of a histidine at position 426 in CRM 66. In the native conformation, CRM 66 demonstrated a limited ability (by a factor or at least 100,000) to modify EF-2 covalently and lacked in vitro and in vivo cytotoxicity, yet CRM 66 appeared to be normal with respect to NAD+ binding. Upon activation with urea and dithiothreitol, CRM 66 lost ADP-ribosyltransferase activity entirely yet CRM 66 retained the ability to bind NAD+. Replacement of Tyr-426 with histidine in CRM 66 completely restored cytotoxicity and ADP-ribosyltransferase activity. These results support previous findings from this laboratory (Wozniak, D. J., Hsu, L.-Y., and Galloway, D. R. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 8880-8884) which suggest that the His-426 residue of ETA is not involved in NAD+ binding but appears to be associated with the interaction between ETA and EF-2." @default.
• W1505124506 created "2016-06-24" @default.
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• W1505124506 date "1989-09-05" @default.
• W1505124506 modified "2023-09-23" @default.
• W1505124506 title "Biochemical analysis of CRM 66. A nonfunctional Pseudomonas aeruginosa exotoxin A." @default.
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• W1505124506 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2504713" @default.
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