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Journal of Bacteriology, March 1999, p. 1698-1702, Vol. 181, No. 5
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Correlation of Activity Regulation and Substrate Recognition of the ADP-Ribosyltransferase That Regulates Nitrogenase Activity in Rhodospirillum rubrum

Kitai Kim,1,2 Yaoping Zhang,1,2,3 and Gary P. Roberts1,2,*

Departments of Bacteriology1 and Biochemistry3 and The Center for the Study of Nitrogen Fixation,2 University of Wisconsin---Madison, Madison, Wisconsin 53706

Received 23 February 1998/Accepted 20 December 1998

In Rhodospirillum rubrum, nitrogenase activity is regulated posttranslationally through the ADP-ribosylation of dinitrogenase reductase by dinitrogenase reductase ADP-ribosyltransferase (DRAT). Several DRAT variants that are altered both in the posttranslational regulation of DRAT activity and in the ability to recognize variants of dinitrogenase reductase have been found. This correlation suggests that these two properties are biochemically connected.

* Corresponding author. Mailing address: University of Wisconsin---Madison, Department of Bacteriology, 106A E. B. Fred Hall, 1550 Linden Dr., Madison, WI 53706-1567. Phone: (608) 262-3567. Fax: (608) 262-9865. E-mail: groberts{at}bact.wisc.edu.

Journal of Bacteriology, March 1999, p. 1698-1702, Vol. 181, No. 5
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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