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Structural and Enzymatic Characterization of a Nucleoside Diphosphate Sugar Hydrolase from Bdellovibrio bacteriovorus

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [2]
  1. Johns Hopkins Univ., Baltimore, MD (United States). School of Medicine; DOE/OSTI
  2. Johns Hopkins Univ., Baltimore, MD (United States). School of Medicine
  3. Loyola University, Baltimore, MD (United States)
  4. Univ. of Maryland, Baltimore, MD (United States); U.S. Food and Drug Administration (FDA), Rockville, MD (United States)

Given the broad range of substrates hydrolyzed by Nudix (nucleoside diphosphate linked to X) enzymes, identification of sequence and structural elements that correctly predict a Nudix substrate or characterize a family is key to correctly annotate the myriad of Nudix enzymes. Here, we present the structure determination and characterization of Bd3179 –- a Nudix hydrolase from Bdellovibrio bacteriovorus–that we show localized in the periplasmic space of this obligate Gram-negative predator. We demonstrate that the enzyme is a nucleoside diphosphate sugar hydrolase (NDPSase) and has a high degree of sequence and structural similarity to a canonical ADP-ribose hydrolase and to a nucleoside diphosphate sugar hydrolase (1.4 and 1.3 Å Cα RMSD respectively). Examination of the structural elements conserved in both types of enzymes confirms that an aspartate-X-lysine motif on the C-terminal helix of the α-β-α NDPSase fold differentiates NDPSases from ADPRases.

Research Organization:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Stewart Trust Fellowship; National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
SC0012704; AC02-98CH10886
OSTI ID:
1627768
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 11 Vol. 10; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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