skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A novel cofactor-binding mode in bacterial IMP dehydrogenases explains inhibitor selectivity

Journal Article · · Journal of Biological Chemistry
 [1];  [1];  [1];  [2];  [1];  [3];  [3];  [3];  [3];  [3];  [2]
  1. Univ. of Chicago, Chicago, IL (United States)
  2. Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Brandeis Univ., Waltham, MA (United States)

The steadily rising frequency of emerging diseases and antibiotic resistance creates an urgent need for new drugs and targets. Inosine 5'-monophosphate dehydrogenase (IMP dehydrogenase or IMPDH) is a promising target for the development of new antimicrobial agents. IMPDH catalyzes the oxidation of IMP to XMP with the concomitant reduction of NAD+, which is the pivotal step in the biosynthesis of guanine nucleotides. Potent inhibitors of bacterial IMPDHs have been identified that bind in a structurally distinct pocket that is absent in eukaryotic IMPDHs. The physiological role of this pocket was not understood. Here, we report the structures of complexes with different classes of inhibitors of Bacillus anthracis, Campylobacter jejuni, and Clostridium perfringens IMPDHs. These structures in combination with inhibition studies provide important insights into the interactions that modulate selectivity and potency. We also present two structures of the Vibrio cholerae IMPDH in complex with IMP/NAD+ and XMP/NAD+. In both structures, the cofactor assumes a dramatically different conformation than reported previously for eukaryotic IMPDHs and other dehydrogenases, with the major change observed for the position of the NAD+ adenosine moiety. More importantly, this new NAD+-binding site involves the same pocket that is utilized by the inhibitors. Thus, the bacterial IMPDH-specific NAD+-binding mode helps to rationalize the conformation adopted by several classes of prokaryotic IMPDH inhibitors. As a result, these findings offer a potential strategy for further ligand optimization.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02–06CH11357; HHSN272200700058C; HHSN272201200026C
OSTI ID:
1225229
Journal Information:
Journal of Biological Chemistry, Vol. 290, Issue 9; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

References (49)

Antibiotics for Emerging Pathogens journal August 2009
Structure of Apo- and Monometalated Forms of NDM-1—A Highly Potent Carbapenem-Hydrolyzing Metallo-β-Lactamase journal September 2011
The Antibiotic Potential of Prokaryotic IMP Dehydrogenase Inhibitors journal May 2011
Structural Determinants of Inhibitor Selectivity in Prokaryotic IMP Dehydrogenases journal October 2010
Triazole-Linked Inhibitors of Inosine Monophosphate Dehydrogenase from Human and Mycobacterium tuberculosis journal June 2010
Identification of Novel Mt-Guab2 Inhibitor Series Active against M. tuberculosis journal March 2012
Repurposing Cryptosporidium Inosine 5′-Monophosphate Dehydrogenase Inhibitors as Potential Antibacterial Agents journal June 2014
IMP Dehydrogenase: Structure, Mechanism, and Inhibition journal July 2009
Bacillus anthracis Inosine 5′-Monophosphate Dehydrogenase in Action: The First Bacterial Series of Structures of Phosphate Ion-, Substrate-, and Product-Bound Complexes journal July 2012
The TIM-barrel fold: a versatile framework for efficient enzymes journal March 2001
The structure of a domain common to archaebacteria and the homocystinuria disease protein journal January 1997
Characteristics and Crystal Structure of Bacterial Inosine-5‘-monophosphate Dehydrogenase , journal April 1999
The Immunosuppressive Agent Mizoribine Monophosphate Forms a Transition State Analogue Complex with Inosine Monophosphate Dehydrogenase journal February 2003
Biochemical Analysis of the Modular Enzyme Inosine 5′-Monophosphate Dehydrogenase journal November 1999
The CBS subdomain of inosine 5′-monophosphate dehydrogenase regulates purine nucleotide turnover: CBS subdomain of IMPDH journal February 2008
Crystal structure of human type II inosine monophosphate dehydrogenase: Implications for ligand binding and drug design journal March 1999
Crystal Structure of a Ternary Complex of Tritrichomonas foetus Inosine 5‘-Monophosphate Dehydrogenase:  NAD + Orients the Active Site Loop for Catalysis , journal November 2002
Cofactor-type inhibitors of inosine monophosphate dehydrogenase via modular approach: Targeting the pyrophosphate binding sub-domain journal March 2011
Inosine Monophosphate Dehydrogenase and Its Inhibitors: An Overview book March 2003
Targeting a Prokaryotic Protein in a Eukaryotic Pathogen: Identification of Lead Compounds against Cryptosporidiosis journal January 2008
A Screening Pipeline for Antiparasitic Agents Targeting Cryptosporidium Inosine Monophosphate Dehydrogenase journal August 2010
Triazole Inhibitors of Cryptosporidium parvum Inosine 5′-Monophosphate Dehydrogenase journal August 2009
Structure–activity relationship study of selective benzimidazole-based inhibitors of Cryptosporidium parvum IMPDH journal March 2012
Optimization of Benzoxazole-Based Inhibitors of Cryptosporidium parvum Inosine 5′-Monophosphate Dehydrogenase journal May 2013
Phthalazinone inhibitors of inosine-5′-monophosphate dehydrogenase from Cryptosporidium parvum journal February 2013
Selective and Potent Urea Inhibitors of Cryptosporidium parvum Inosine 5′-Monophosphate Dehydrogenase journal September 2012
The Structural Basis of Cryptosporidium-Specific IMP Dehydrogenase Inhibitor Selectivity journal February 2010
Integration of PCR Fragments at Any Specific Site within Cloning Vectors without the Use of Restriction Enzymes and DNA Ligase journal July 2001
High-throughput protein purification and quality assessment for crystallization journal September 2011
The Structural Biology Center 19ID undulator beamline: facility specifications and protein crystallographic results journal December 2005
HKL -3000: the integration of data reduction and structure solution – from diffraction images to an initial model in minutes journal July 2006
Overview of the CCP 4 suite and current developments journal March 2011
Coot model-building tools for molecular graphics journal November 2004
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
Refinement of Macromolecular Structures by the Maximum-Likelihood Method journal May 1997
Use of TLS parameters to model anisotropic displacements in macromolecular refinement journal January 2001
MolProbity: all-atom contacts and structure validation for proteins and nucleic acids journal May 2007
Asp338 Controls Hydride Transfer in Escherichia coli IMP Dehydrogenase journal August 2000
The photochemistry of the N-oxide function journal February 1984
Purine N-Oxides. XII. Photochemical Changes Induced by Ultraviolet Radiation * journal July 1964
Allosteric Activation via Kinetic Control: Potassium Accelerates a Conformational Change in IMP Dehydrogenase journal October 2011
Imidazole-2-Thiones: Synthesis, Structure, Properties journal June 1991
2 Evolutionary and Structural Relationships among Dehydrogenases book January 1975
Unusual conformation of nicotinamide adenine dinucleotide (NAD) bound to diphtheria toxin: A comparison with NAD bound to the oxidoreductase enzymes journal October 1997
Linking Distinct Conformations of Nicotinamide Adenine Dinucleotide with Protein Fold/Function journal June 2011
Cofactor mobility determines reaction outcome in the IMPDH and GMPR (β-α)8 barrel enzymes journal October 2011
Pharmacophore Binding Motifs for Nicotinamide Adenine Dinucleotide Analogues Across Multiple Protein Families: A Detailed Contact-Based Analysis of the Interaction between Proteins and NAD(P) Cofactors journal July 2013
Multiple sequence alignment with hierarchical clustering journal November 1988
Deciphering key features in protein structures with the new ENDscript server journal April 2014

Cited By (3)

Unpacking the Pathogen Box—An Open Source Tool for Fighting Neglected Tropical Disease journal January 2019
Horizontal transfer of a pathway for coumarate catabolism unexpectedly inhibits purine nucleotide biosynthesis journal October 2019
Mycobacterium tuberculosis IMPDH in Complexes with Substrates, Products and Antitubercular Compounds journal October 2015