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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Silverman, M. S. Boquet, P. Pappenheimer, A. M. Vernon, W. B. |
| Abstract | Binding of the nonionic detergent [3H]Triton X-100 by diphtheria toxin, by the nontoxic serologically related protein crossreacting material (CRM) 45, and by their respective A and B fragments has been studied. If first denatured in 0.1% sodium dodecyl sulfate, all of the proteins with the exception of fragment A bind increasing amounts of Triton X-100, reaching a maximum of more than 40 mol bound per mol of protein when the detergent concentration exceeds its critical micelle concentration. No measurable amount of Triton X-100 is bound by native toxin or its A fragment of any concentration of the detergent. Undenatured CRM45 or its B45 fragment, on the other hand, readily became inserted into Triton X-100 micelles when the detergent reaches its critical micelle concentration. The results show that the toxin molecule contains a hydrophobic domain located on the portion of the B fragment that is linked to A. This region is masked in native toxin. Based on these findings, a model is proposed to describe how fragment B facilitates the transport of the enzymically active hydrophilic fragment A across the plasma membrane to reach the cytoplasm. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 12 |
| Volume Number | 73 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1976-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Diphtheria Toxin Metabolism Polyethylene Glycols Quaternary Ammonium Compounds Binding Sites Biological Transport Epitopes Models, Biological Peptides Solubility Structure-Activity Relationship Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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