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Sharma MF, Sharma SK, Streeter CC, Firestine SM. A Fluorescence-Based Assay for N 5 -Carboxyaminoimidazole Ribonucleotide Mutase. Chembiochem 2023; 24:e202300347. [PMID: 37474455 PMCID: PMC10644341 DOI: 10.1002/cbic.202300347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/04/2023] [Accepted: 07/18/2023] [Indexed: 07/22/2023]
Abstract
The enzyme N5 -carboxylaminoinidazole ribonucleotide (N5 -CAIR) mutase is found in microbial de novo purine biosynthesis but is absent in humans making it an attractive antimicrobial target. N5 -CAIR mutase catalyzes the synthesis of carboxyaminoimidazole ribonucleotide (CAIR) from N5 -CAIR which is itself prepared from aminoimidazole ribonucleotide (AIR) by the enzyme N5 -CAIR synthetase. During our research on identifying inhibitors of N5 -CAIR mutase, we developed an innovative, fluorescence-based assay to measure the activity of this enzyme. This assay relies upon our recent serendipitous observation that AIR reversibly reacts with the compound isatin. Reaction of a fluorescently-tagged isatin with AIR resulted in a large increase in fluorescence intensity allowing a measurement of the concentration of AIR in solution. From this observation, we developed a reproducible, non-continuous assay that can replicate the known kinetic parameters of the enzyme and can readily detect a recognized inhibitor of the enzyme. This assay should find utility in screening for inhibitors targeting N5 -CAIR mutase.
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Affiliation(s)
- Marcella F. Sharma
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan, 48201, United States
| | - Shiv K. Sharma
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan, 48201, United States
| | - Cale C. Streeter
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan, 48201, United States
| | - Steven M. Firestine
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan, 48201, United States
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Streeter CC, Lin Q, Firestine SM. Isatins Inhibit N 5-CAIR Synthetase by a Substrate Depletion Mechanism. Biochemistry 2019; 58:2260-2268. [PMID: 30964980 DOI: 10.1021/acs.biochem.8b00939] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The continued rise of antibiotic-resistant infections coupled with the limited pipeline of new antimicrobials highlights the pressing need for the development of new antibacterial agents. One potential pathway for new agents is de novo purine biosynthesis as studies have shown that bacteria and lower eukaryotes synthesize purines differently than humans. Microorganisms utilize two enzymes, N5-CAIR synthetase and N5-CAIR mutase, to convert 5-aminoimidazole ribonucleotide (AIR) into 4-carboxy-5-aminoimidazole ribonucleotide (CAIR) through the intermediate N5-carboxy-5-aminoimidazole ribonucleotide (N5-CAIR). In contrast, vertebrates directly convert AIR to CAIR via the enzyme AIR carboxylase. A high-throughput screen against N5-CAIR synthetase identified a group of compounds with a 2,3-indolinedione (isatin) core that inhibited the enzyme. While initial studies suggested that isatins inhibited the enzyme by a noncompetitive mechanism, here we show that isatins inhibit N5-CAIR synthetase by a substrate depletion mechanism. Unexpectedly, we found that isatin reacts rapidly and reversibly with the substrate AIR. The rate of the reaction is dependent upon the substituents on the phenyl moiety of isatin, with 5- and 7-bromoisatin being faster than 4-bromoisatin. These studies suggest that care should be taken when exploring isatin compounds because the biological activity could be a result of their reactivity.
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Affiliation(s)
- Cale C Streeter
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences , Wayne State University , Detroit , Michigan 48201 , United States
| | - Qian Lin
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences , Wayne State University , Detroit , Michigan 48201 , United States
| | - Steven M Firestine
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences , Wayne State University , Detroit , Michigan 48201 , United States
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Bender G, Schexnaydre EE, Murphy RC, Uhlson C, Newcomer ME. Membrane-dependent Activities of Human 15-LOX-2 and Its Murine Counterpart: IMPLICATIONS FOR MURINE MODELS OF ATHEROSCLEROSIS. J Biol Chem 2016; 291:19413-24. [PMID: 27435673 DOI: 10.1074/jbc.m116.741454] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Indexed: 12/17/2022] Open
Abstract
The enzyme encoded by the ALOX15B gene has been linked to the development of atherosclerotic plaques in humans and in a mouse model of hypercholesterolemia. In vitro, these enzymes, which share 78% sequence identity, generate distinct products from their substrate arachidonic acid: the human enzyme, a 15-S-hydroperoxy product; and the murine enzyme, an 8-S-product. We probed the activities of these enzymes with nanodiscs as membrane mimics to determine whether they can access substrate esterified in a bilayer and characterized their activities at the membrane interface. We observed that both enzymes transform phospholipid-esterified arachidonic acid to a 15-S-product. Moreover, when expressed in transfected HEK cells, both enzymes result in significant increases in the amounts of 15-hydroxyderivatives of eicosanoids detected. In addition, we show that 15-LOX-2 is distributed at the plasma membrane when the HEK293 cells are stimulated by the addition Ca(2+) ionophore and that cellular localization is dependent upon the presence of a putative membrane insertion loop. We also report that sequence differences between the human and mouse enzymes in this loop appear to confer distinct mechanisms of enzyme-membrane interaction for the homologues.
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Affiliation(s)
- Gunes Bender
- From the Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803 and
| | - Erin E Schexnaydre
- From the Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803 and
| | - Robert C Murphy
- the Department of Pharmacology, University of Colorado at Denver, Aurora, Colorado 80045
| | - Charis Uhlson
- the Department of Pharmacology, University of Colorado at Denver, Aurora, Colorado 80045
| | - Marcia E Newcomer
- From the Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803 and
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Tuntland ML, Santarsiero BD, Johnson ME, Fung LWM. Elucidation of the bicarbonate binding site and insights into the carboxylation mechanism of (N(5))-carboxyaminoimidazole ribonucleotide synthase (PurK) from Bacillus anthracis. ACTA ACUST UNITED AC 2014; 70:3057-65. [PMID: 25372694 DOI: 10.1107/s1399004714021166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 09/23/2014] [Indexed: 11/11/2022]
Abstract
Structures of (N(5))-carboxyaminoimidazole ribonucleotide synthase (PurK) from Bacillus anthracis with various combinations of ATP, ADP, Mg(2+), bicarbonate and aminoimidazole ribonucleotide (AIR) in the active site are presented. The binding site of bicarbonate has only been speculated upon previously, but is shown here for the first time. The binding involves interactions with the conserved residues Arg272, His274 and Lys348. These structures provide insights into each ligand in the active site and allow a possible mechanism to be proposed for the reaction that converts bicarbonate and AIR, in the presence of ATP, to produce (N(5))-carboxyaminoimidazole ribonucleotide. The formation of a carboxyphosphate intermediate through ATP phosphoryl transfer is proposed, followed by carboxylation of AIR to give the product, facilitated by a cluster of conserved residues and an active-site water network.
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Affiliation(s)
- Micheal L Tuntland
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Bernard D Santarsiero
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Michael E Johnson
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Leslie W M Fung
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, USA
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Neau DB, Bender G, Boeglin WE, Bartlett SG, Brash AR, Newcomer ME. Crystal structure of a lipoxygenase in complex with substrate: the arachidonic acid-binding site of 8R-lipoxygenase. J Biol Chem 2014; 289:31905-31913. [PMID: 25231982 DOI: 10.1074/jbc.m114.599662] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Lipoxygenases (LOX) play critical roles in mammalian biology in the generation of potent lipid mediators of the inflammatory response; consequently, they are targets for the development of isoform-specific inhibitors. The regio- and stereo-specificity of the oxygenation of polyunsaturated fatty acids by the enzymes is understood in terms of the chemistry, but structural observation of the enzyme-substrate interactions is lacking. Although several LOX crystal structures are available, heretofore the rapid oxygenation of bound substrate has precluded capture of the enzyme-substrate complex, leaving a gap between chemical and structural insights. In this report, we describe the 2.0 Å resolution structure of 8R-LOX in complex with arachidonic acid obtained under anaerobic conditions. Subtle rearrangements, primarily in the side chains of three amino acids, allow binding of arachidonic acid in a catalytically competent conformation. Accompanying experimental work supports a model in which both substrate tethering and cavity depth contribute to positioning the appropriate carbon at the catalytic machinery.
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Affiliation(s)
- David B Neau
- Department of Chemistry and Chemical Biology, Cornell University, Northeastern Collaborative Access Team, Argonne National Laboratory, Argonne, Illinois 60439, and
| | - Gunes Bender
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803
| | - William E Boeglin
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Sue G Bartlett
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Alan R Brash
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Marcia E Newcomer
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803,.
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