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Hargrove TY, Wawrzak Z, Fisher PM, Child SA, Nes WD, Guengerich FP, Waterman MR, Lepesheva GI. Binding of a physiological substrate causes large-scale conformational reorganization in cytochrome P450 51. J Biol Chem 2018; 293:19344-19353. [PMID: 30327430 DOI: 10.1074/jbc.ra118.005850] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 10/15/2018] [Indexed: 11/06/2022] Open
Abstract
Sterol 14α-demethylases (CYP51s) are phylogenetically the most conserved cytochromes P450, and their three-step reaction is crucial for biosynthesis of sterols and serves as a leading target for clinical and agricultural antifungal agents. The structures of several (bacterial, protozoan, fungal, and human) CYP51 orthologs, in both the ligand-free and inhibitor-bound forms, have been determined and have revealed striking similarity at the secondary and tertiary structural levels, despite having low sequence identity. Moreover, in contrast to many of the substrate-promiscuous, drug-metabolizing P450s, CYP51 structures do not display substantial rearrangements in their backbones upon binding of various inhibitory ligands, essentially representing a snapshot of the ligand-free sterol 14α-demethylase. Here, using the obtusifoliol-bound I105F variant of Trypanosoma cruzi CYP51, we report that formation of the catalytically competent complex with the physiological substrate triggers a large-scale conformational switch, dramatically reshaping the enzyme active site (3.5-6.0 Å movements in the FG arm, HI arm, and helix C) in the direction of catalysis. Notably, our X-ray structural analyses revealed that the substrate channel closes, the proton delivery route opens, and the topology and electrostatic potential of the proximal surface reorganize to favor interaction with the electron-donating flavoprotein partner, NADPH-cytochrome P450 reductase. Site-directed mutagenesis of the amino acid residues involved in these events revealed a key role of active-site salt bridges in contributing to the structural dynamics that accompanies CYP51 function. Comparative analysis of apo-CYP51 and its sterol-bound complex provided key conceptual insights into the molecular mechanisms of CYP51 catalysis, functional conservation, lineage-specific substrate complementarity, and druggability differences.
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Affiliation(s)
- Tatiana Y Hargrove
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Zdzislaw Wawrzak
- Synchrotron Research Center, Life Science Collaborative Access Team, Northwestern University, Argonne, Illinois 60439
| | - Paxtyn M Fisher
- the Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and
| | - Stella A Child
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - W David Nes
- the Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and
| | - F Peter Guengerich
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Michael R Waterman
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Galina I Lepesheva
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, .,the Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232
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2
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Hargrove TY, Wawrzak Z, Lamb DC, Guengerich FP, Lepesheva GI. Structure-Functional Characterization of Cytochrome P450 Sterol 14α-Demethylase (CYP51B) from Aspergillus fumigatus and Molecular Basis for the Development of Antifungal Drugs. J Biol Chem 2015; 290:23916-34. [PMID: 26269599 DOI: 10.1074/jbc.m115.677310] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Indexed: 01/18/2023] Open
Abstract
Aspergillus fumigatus is the opportunistic fungal pathogen that predominantly affects the immunocompromised population and causes 600,000 deaths/year. The cytochrome P450 51 (CYP51) inhibitor voriconazole is currently the drug of choice, yet the treatment efficiency remains low, calling for rational development of more efficient agents. A. fumigatus has two CYP51 genes, CYP51A and CYP51B, which share 59% amino acid sequence identity. CYP51B is expressed constitutively, whereas gene CYP51A is reported to be inducible. We expressed, purified, and characterized A. fumigatus CYP51B, including determination of its substrate preferences, catalytic parameters, inhibition, and x-ray structure in complexes with voriconazole and the experimental inhibitor (R)-N-(1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethyl)-4-(5-phenyl-1,3,4-oxadiazol-2-yl)benzamide (VNI). The enzyme demethylated its natural substrate eburicol and the plant CYP51 substrate obtusifoliol at steady-state rates of 17 and 16 min(-1), respectively, but did not metabolize lanosterol, and the topical antifungal drug miconazole was the strongest inhibitor that we identified. The x-ray crystal structures displayed high overall similarity of A. fumigatus CYP51B to CYP51 orthologs from other biological kingdoms but revealed phylum-specific differences relevant to enzyme catalysis and inhibition. The complex with voriconazole provides an explanation for the potency of this relatively small molecule, whereas the complex with VNI outlines a direction for further enhancement of the efficiency of this new inhibitory scaffold to treat humans afflicted with filamentous fungal infections.
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Affiliation(s)
- Tatiana Y Hargrove
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Zdzislaw Wawrzak
- the Synchrotron Research Center, Life Science Collaborative Access Team, Northwestern University, Argonne, Illinois 60439
| | - David C Lamb
- Swansea University, Swansea, Wales SA2 8PP, United Kingdom, and
| | - F Peter Guengerich
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Galina I Lepesheva
- From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, the Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232
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3
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Chen F, Lin D, Wang J, Li B, Duan H, Liu J, Liu X. Heterologous expression of the Monilinia fructicola CYP51 (MfCYP51) gene in Pichia pastoris confirms the mode of action of the novel fungicide, SYP-Z048. Front Microbiol 2015; 6:457. [PMID: 26042103 PMCID: PMC4437033 DOI: 10.3389/fmicb.2015.00457] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 04/27/2015] [Indexed: 11/23/2022] Open
Abstract
The novel agricultural fungicide 3-[5-(4-chlorophenyl)-2,3-dimethyl-3-isoxazolidinyl] pyridine (SYP-Z048) developed by China Shenyang Research Institute of Chemical Industry has been confirmed to be an ergosterol biosynthesis inhibitor (EBI). Previous studies have shown that EBIs target the proteins from a range of genes, including CYP51, ERG2 and/or ERG24, and ERG27, which are involved in the ergosterol biosynthesis pathway. In the current study the ERG2, ERG24, and ERG27 genes were cloned from wild type and resistant mutants of Monilinia fructicola in an attempt to clarify the target site of SYP-Z048. Comparative analysis of the deduced aa sequence of these genes, as well as CYP51, revealed several point mutations that resulted in amino acid variation among the sensitive and resistant isolates. However, sensitivity assays indicated that only one, the substitution of phenylalanine (F) for the tyrosine (Y) at 136 in CYP51, was correlated with reduced sensitivity to SYP-Z048. Heterologous expression of MfCYP51-136Y (MfCYP136Y) and MfCYP51-136F (MfCYP136F) in Pichia pastoris revealed that MfCYP136F significantly reduced sensitivity to SYP-Z048, increasing the average EC50 of the transformants 11-fold relative to those carrying MfCYP136Y. However, neither the additional copy of MfCYP136Y nor multiple copies of MfCYP136F were found to reduce sensitivity relative to the empty vector control or single copy transformants, respectively. Molecular docking experiments using SYP-Z048 with HsCYP145Y and the mutated version HsCYP145F as substitutes for MfCYP136Y and MfCYP136F, respectively, indicated that the reduced affinity of HsCYP145F for SYP-Z048 resulted from the loss of a hydrogen bond between the fungicide and the active site. Taken together these results indicate that MfCYP51 is the major target site of SYP-Z048 in M. fructicola, which has important implications for the resistance management of this fungicide in the field.
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Affiliation(s)
- Fengping Chen
- Key Laboratory of Plant Virology of Fujian Province, Institute of Plant Virology, Fujian Agriculture and Forestry UniversityFuzhou, China
- Department of Plant Pathology, China Agricultural UniversityBeijing, China
| | - Dong Lin
- Department of Plant Pathology, China Agricultural UniversityBeijing, China
| | - Jingyuan Wang
- Department of Plant Pathology, China Agricultural UniversityBeijing, China
| | - Botao Li
- Department of Plant Pathology, China Agricultural UniversityBeijing, China
- Taizhou Entry-Exit Inspection and Quarantine BureauZhejiang, China
| | - Hongxia Duan
- Department of Chemistry, College of Science, China Agricultural UniversityBeijing, China
| | - Junli Liu
- State Key Laboratory of the Discovery and Development of Novel Pesticide, China Shenyang Research Institute of Chemical IndustryShenyang, China
| | - Xili Liu
- Department of Plant Pathology, China Agricultural UniversityBeijing, China
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4
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Architecture of a single membrane spanning cytochrome P450 suggests constraints that orient the catalytic domain relative to a bilayer. Proc Natl Acad Sci U S A 2014; 111:3865-70. [PMID: 24613931 DOI: 10.1073/pnas.1324245111] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Bitopic integral membrane proteins with a single transmembrane helix play diverse roles in catalysis, cell signaling, and morphogenesis. Complete monospanning protein structures are needed to show how interaction between the transmembrane helix and catalytic domain might influence association with the membrane and function. We report crystal structures of full-length Saccharomyces cerevisiae lanosterol 14α-demethylase, a membrane monospanning cytochrome P450 of the CYP51 family that catalyzes the first postcyclization step in ergosterol biosynthesis and is inhibited by triazole drugs. The structures reveal a well-ordered N-terminal amphipathic helix preceding a putative transmembrane helix that would constrain the catalytic domain orientation to lie partly in the lipid bilayer. The structures locate the substrate lanosterol, identify putative substrate and product channels, and reveal constrained interactions with triazole antifungal drugs that are important for drug design and understanding drug resistance.
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5
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Denisov IG, Shih AY, Sligar SG. Structural differences between soluble and membrane bound cytochrome P450s. J Inorg Biochem 2011; 108:150-8. [PMID: 22244217 DOI: 10.1016/j.jinorgbio.2011.11.026] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 10/28/2011] [Accepted: 11/08/2011] [Indexed: 12/24/2022]
Abstract
The superfamily of cytochrome P450s forms a large class of heme monooxygenases with more than 13,000 enzymes represented in organisms from all biological kingdoms. Despite impressive variability in sizes, sequences, location, and function, all cytochrome P450s from various organisms have very similar tertiary structures within the same fold. Here we show that systematic comparison of all available X-ray structures of cytochrome P450s reveals the presence of two distinct structural classes of cytochrome P450s. For all membrane bound enzymes, except the CYP51 family, the beta-domain and the A-propionate heme side chain are shifted towards the proximal side of the heme plane, which may result in an increase of the volume of the substrate binding pocket and an opening of a potential channel for the substrate access and/or product escape directly into the membrane. This structural feature is also observed in several soluble cytochrome P450s, such as CYP108, CYP151, and CYP158A2, which catalyze transformations of bulky substrates. Alternatively, both beta-domains and the A-propionate side chains in the soluble isozymes extend towards the distal site of the heme. This difference between the structures of soluble and membrane bound cytochrome P450s can be rationalized through the presence of several amino acid inserts in the latter class which are involved in direct interactions with the membrane, namely the F'- and G'-helices. Molecular dynamics using the most abundant human cytochrome P450, CYP3A4, incorporated into a model POPC bilayer reveals the facile conservation of a substrate access channel, directed into the membrane between the B-C loop and the beta domain, and the closure of the peripheral substrate access channel directed through the B-C loop. This is in contrast to the case when the same simulation is run in buffer, where no such channel closing occurs. Taken together, these results reveal a key structural difference between membrane bound and soluble cytochrome P450s with important functional implications induced by the lipid bilayer.
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Affiliation(s)
- I G Denisov
- Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA
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6
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Berka K, Hendrychová T, Anzenbacher P, Otyepka M. Membrane position of ibuprofen agrees with suggested access path entrance to cytochrome P450 2C9 active site. J Phys Chem A 2011; 115:11248-55. [PMID: 21744854 PMCID: PMC3257864 DOI: 10.1021/jp204488j] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
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Cytochrome P450 2C9 (CYP2C9) is a membrane-anchored human microsomal protein involved in the drug metabolism in liver. CYP2C9 consists of an N-terminal transmembrane anchor and a catalytic cytoplasmic domain. While the structure of the catalytic domain is well-known from X-ray experiments, the complete structure and its incorporation into the membrane remains unsolved. We constructed an atomistic model of complete CYP2C9 in a dioleoylphosphatidylcholine membrane and evolved it by molecular dynamics simulations in explicit water on a 100+ ns time-scale. The model agrees well with known experimental data about membrane positioning of cytochromes P450. The entry to the substrate access channel is proposed to be facing the membrane interior while the exit of the product egress channel is situated above the interface pointing toward the water phase. The positions of openings of the substrate access and product egress channels correspond to free energy minima of CYP2C9 substrate ibuprofen and its metabolite in the membrane, respectively.
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Affiliation(s)
- Karel Berka
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Olomouc, Czech Republic
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7
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Atkins WM, Qian H. Stochastic ensembles, conformationally adaptive teamwork, and enzymatic detoxification. Biochemistry 2011; 50:3866-72. [PMID: 21473615 DOI: 10.1021/bi200275r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
It has been appreciated for a long time that enzymes exist as conformational ensembles throughout multiple stages of the reactions they catalyze, but there is renewed interest in the functional implications. The energy landscape that results from conformationlly diverse poteins is a complex surface with an energetic topography in multiple dimensions, even at the transition state(s) leading to product formation, and this represents a new paradigm. At the same time there has been renewed interest in conformational ensembles, a new paradigm concerning enzyme function has emerged, wherein catalytic promiscuity has clear biological advantages in some cases. "Useful", or biologically functional, promiscuity or the related behavior of "multifunctionality" can be found in the immune system, enzymatic detoxification, signal transduction, and the evolution of new function from an existing pool of folded protein scaffolds. Experimental evidence supports the widely held assumption that conformational heterogeneity promotes functional promiscuity. The common link between these coevolving paradigms is the inherent structural plasticity and conformational dynamics of proteins that, on one hand, lead to complex but evolutionarily selected energy landscapes and, on the other hand, promote functional promiscuity. Here we consider a logical extension of the overlap between these two nascent paradigms: functionally promiscuous and multifunctional enzymes such as detoxification enzymes are expected to have an ensemble landscape with more states accessible on multiple time scales than substrate specific enzymes. Two attributes of detoxification enzymes become important in the context of conformational ensembles: these enzymes metabolize multiple substrates, often in substrate mixtures, and they can form multiple products from a single substrate. These properties, combined with complex conformational landscapes, lead to the possibility of interesting time-dependent, or emergent, properties. Here we demonstrate these properties with kinetic simulations of nonequilibrium steady state (NESS) behavior resulting from energy landscapes expected for detoxification enzymes. Analogous scenarios with other promiscuous enzymes may be worthy of consideration.
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Affiliation(s)
- William M Atkins
- Department of Medicinal Chemistry and Department of Applied Mathematics, University of Washington, Seattle, Washington 98190, United States.
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8
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Lepesheva GI, Waterman MR. Structural basis for conservation in the CYP51 family. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1814:88-93. [PMID: 20547249 DOI: 10.1016/j.bbapap.2010.06.006] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2010] [Revised: 06/01/2010] [Accepted: 06/02/2010] [Indexed: 11/26/2022]
Abstract
Sterol 14α-demethylases (14DM) comprise the CYP51 cytochrome P450 genome family. The 14DM reaction is essential for the biosynthesis of sterols which are necessary for production of cellular membranes. This is the most widely distributed P450, being present in all biological kingdoms. From one kingdom to another the primary amino acid sequence identity usually ranges between 30 and 20%. In this minireview we describe the conservation of specific amino acids and the various CYP51 orthologs and indicate the roles that they may play in the structure/function of this monooxygenase. The prediction of the roles of different amino acids in 14DM is based on high resolution tertiary structures of these enzymes which set the stage for detailed understanding of the 14α-demethylase reaction and its selective, phyla-specific inhibition which is crucial for the design of potent inhibitors for treatment of infection by pathogenic microbes.
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Affiliation(s)
- Galina I Lepesheva
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA.
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9
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Lepesheva GI, Park HW, Hargrove TY, Vanhollebeke B, Wawrzak Z, Harp JM, Sundaramoorthy M, Nes WD, Pays E, Chaudhuri M, Villalta F, Waterman MR. Crystal structures of Trypanosoma brucei sterol 14alpha-demethylase and implications for selective treatment of human infections. J Biol Chem 2010; 285:1773-80. [PMID: 19923211 PMCID: PMC2804335 DOI: 10.1074/jbc.m109.067470] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 10/29/2009] [Indexed: 11/06/2022] Open
Abstract
Sterol 14alpha-demethylase (14DM, the CYP51 family of cytochrome P450) is an essential enzyme in sterol biosynthesis in eukaryotes. It serves as a major drug target for fungal diseases and can potentially become a target for treatment of human infections with protozoa. Here we present 1.9 A resolution crystal structures of 14DM from the protozoan pathogen Trypanosoma brucei, ligand-free and complexed with a strong chemically selected inhibitor N-1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethyl)-4-(5-phenyl-1,3,4-oxadi-azol-2-yl)benzamide that we previously found to produce potent antiparasitic effects in Trypanosomatidae. This is the first structure of a eukaryotic microsomal 14DM that acts on sterol biosynthesis, and it differs profoundly from that of the water-soluble CYP51 family member from Mycobacterium tuberculosis, both in organization of the active site cavity and in the substrate access channel location. Inhibitor binding does not cause large scale conformational rearrangements, yet induces unanticipated local alterations in the active site, including formation of a hydrogen bond network that connects, via the inhibitor amide group fragment, two remote functionally essential protein segments and alters the heme environment. The inhibitor binding mode provides a possible explanation for both its functionally irreversible effect on the enzyme activity and its selectivity toward the 14DM from human pathogens versus the human 14DM ortholog. The structures shed new light on 14DM functional conservation and open an excellent opportunity for directed design of novel antiparasitic drugs.
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Affiliation(s)
- Galina I Lepesheva
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232, USA.
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10
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Ouellet H, Johnston JB, Ortiz de Montellano PR. The Mycobacterium tuberculosis cytochrome P450 system. Arch Biochem Biophys 2009; 493:82-95. [PMID: 19635450 DOI: 10.1016/j.abb.2009.07.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 07/17/2009] [Accepted: 07/21/2009] [Indexed: 11/25/2022]
Abstract
Tuberculosis remains a leading cause of human mortality. The emergence of strains of Mycobacterium tuberculosis, the causative agent, that are resistant to the major frontline antitubercular drugs increases the urgency for the development of new therapeutic agents. Sequencing of the M. tuberculosis genome revealed the existence of 20 cytochrome P450 enzymes, some of which are potential candidates for drug targeting. The recent burst of studies reporting microarray-based gene essentiality and transcriptome analyses under in vitro, ex vivo and in vivo conditions highlight the importance of selected P450 isoforms for M. tuberculosis viability and pathogenicity. Current knowledge of the structural and biochemical properties of the M. tuberculosis P450 enzymes and their putative redox partners is reviewed, with an emphasis on findings related to their physiological function(s) as well as their potential as drug targets.
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Affiliation(s)
- Hugues Ouellet
- Department of Pharmaceutical Chemistry, University of California San Francisco, 600 16th Street, San Francisco, CA 94158-2517, USA
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11
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Konkle ME, Hargrove TY, Kleshchenko YY, von Kries JP, Ridenour W, Uddin MJ, Caprioli RM, Marnett LJ, Nes WD, Villalta F, Waterman MR, Lepesheva GI. Indomethacin amides as a novel molecular scaffold for targeting Trypanosoma cruzi sterol 14alpha-demethylase. J Med Chem 2009; 52:2846-53. [PMID: 19354253 PMCID: PMC2744100 DOI: 10.1021/jm801643b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Trypanosoma cruzi (TC) causes Chagas disease, which in its chronic stage remains incurable. We have shown recently that specific inhibition of TC sterol 14alpha-demethylase (TCCYP51) with imidazole derivatives is effective in killing both extracellular and intracellular human stages of TC. An alternative set of TCCYP51 inhibitors has been identified using optical high throughput screening followed by web-database search for similar structures. The best TCCYP51 inhibitor from this search was found to have structural similarity to a class of cyclooxygenase-2-selective inhibitors, the indomethacin-amides. A number of indomethacin-amides were found to bind to TCCYP51, inhibit its activity in vitro, and produce strong antiparasitic effects in the cultured TC cells. Analysis of TC sterol composition indicated that the mode of action of the compounds is by inhibition of sterol biosynthesis in the parasite.
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Affiliation(s)
- Mary E. Konkle
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37232, USA
| | - Tatiana Y. Hargrove
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
| | - Yuliya Y. Kleshchenko
- Department of Microbial Pathogenesis and Immune Response, Meharry Medical College, Nashville, TN 37208, USA
| | - Jens P. von Kries
- Screening Unit, Leibniz Institute for Molecular Pharmacology (FMP), Berlin, 13125, Germany
| | - Whitney Ridenour
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
- Mass Spectrometry Research Center, Vanderbilt University
| | - Md. Jashim Uddin
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
| | - Richard M. Caprioli
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
- Mass Spectrometry Research Center, Vanderbilt University
| | - Lawrence J. Marnett
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37232, USA
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
- Vanderbilt Institute of Chemical Biology, Nashville, TN, 37232, USA
| | - W. David Nes
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Fernando Villalta
- Department of Microbial Pathogenesis and Immune Response, Meharry Medical College, Nashville, TN 37208, USA
| | - Michael R. Waterman
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
- Vanderbilt Institute of Chemical Biology, Nashville, TN, 37232, USA
| | - Galina I. Lepesheva
- Department of Biochemistry School of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
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