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Localization of diphtheria toxin nuclease activity to fragment A

Lessnick, Stephen L. and Lyczak, Jeffrey B. and Bruce, Can and Lewis, Donald G. and Kim, Phillip S. and Stolowitz, Mark L. and Hood, Leroy and Wisnieski, Bernadine J. (1992) Localization of diphtheria toxin nuclease activity to fragment A. Journal of Bacteriology, 174 (6). pp. 2032-2038. ISSN 0021-9193. PMCID PMC205811. http://resolver.caltech.edu/CaltechAUTHORS:LESjbact92

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Abstract

We describe a series of experiments that aimed to establish whether nuclease activity is actually associated with diphtheria toxin (DTx) and its A subunit (DTA), as we originally reported (M. P. Chang, R. L. Baldwin, C. Bruce, and B. J. Wisnieski, Science 246:1165-1168, 1989). Here we show that (i) trypsinization of DTx does indeed produce nucleolytically active DTA, (ii) reduction of electroeluted, unreduced, cleaved DTx (58 kDa) yields nuclease-active DTA (24 kDa), and (iii) fractionation of DTx and DTA by anion-exchange chromatography leads to coelution of nuclease activity with both forms of the toxin, even though each form elutes at a distinct salt concentration. In addition, we show that Escherichia coli-derived DTA also expresses nuclease activity. These studies confirm our initial assertion that the nuclease activity observed in DTx preparations is intrinsic to the DTA portion of DTx.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1128/jb.174.6.2032-2038.1992DOIArticle
http://jb.asm.org/content/174/6/2032PublisherArticle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC205811/PubMed CentralArticle
Additional Information:© 1992 American Society for Microbiology. Received 22 July 1991; Accepted 13 January 1992. We thank A. J. Berk and D. P. Nierlich for constructive advice. Special thanks is also extended to Louis Chau for expert technical assistance. This research was supported by NIH research grant GM22240 and the UCLA Academic Senate. S.L.L. held a Short Term Training Program Grant for Excellence in Research, UCLA School of Medicine, Office of the Dean. J.B.L. is supported by USPHS training grant CA09056.
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Funding AgencyGrant Number
NIHGM22240
UCLAUNSPECIFIED
NIHCA09056
PubMed Central ID:PMC205811
Record Number:CaltechAUTHORS:LESjbact92
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LESjbact92
Alternative URL:http://jb.asm.org/cgi/content/abstract/174/6/2032
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6586
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:13 Dec 2006
Last Modified:10 Jul 2017 17:25

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