RESUMO
Toxin-antitoxin (TA) systems regulate fundamental cellular processes in bacteria and represent potential therapeutic targets. We report a new RES-Xre TA system in multiple human pathogens, including Mycobacterium tuberculosis. The toxin, MbcT, is bactericidal unless neutralized by its antitoxin MbcA. To investigate the mechanism, we solved the 1.8 Å-resolution crystal structure of the MbcTA complex. We found that MbcT resembles secreted NAD+-dependent bacterial exotoxins, such as diphtheria toxin. Indeed, MbcT catalyzes NAD+ degradation in vitro and in vivo. Unexpectedly, the reaction is stimulated by inorganic phosphate, and our data reveal that MbcT is a NAD+ phosphorylase. In the absence of MbcA, MbcT triggers rapid M. tuberculosis cell death, which reduces mycobacterial survival in macrophages and prolongs the survival of infected mice. Our study expands the molecular activities employed by bacterial TA modules and uncovers a new class of enzymes that could be exploited to treat tuberculosis and other infectious diseases.
Assuntos
Antitoxinas/metabolismo , Proteínas de Bactérias/metabolismo , Toxinas Bacterianas/metabolismo , Macrófagos/microbiologia , Mycobacterium tuberculosis/enzimologia , Fosforilases/metabolismo , Sistemas Toxina-Antitoxina , Tuberculose/microbiologia , Animais , Antibióticos Antituberculose/farmacologia , Antitoxinas/química , Antitoxinas/genética , Carga Bacteriana , Proteínas de Bactérias/química , Proteínas de Bactérias/genética , Toxinas Bacterianas/química , Toxinas Bacterianas/genética , Células Cultivadas , Modelos Animais de Doenças , Feminino , Interações Hospedeiro-Patógeno , Humanos , Cinética , Macrófagos/efeitos dos fármacos , Camundongos Endogâmicos C57BL , Camundongos SCID , Camundongos Transgênicos , Viabilidade Microbiana , Modelos Moleculares , Mycobacterium smegmatis/enzimologia , Mycobacterium smegmatis/genética , Mycobacterium smegmatis/patogenicidade , Mycobacterium tuberculosis/efeitos dos fármacos , Mycobacterium tuberculosis/genética , Mycobacterium tuberculosis/patogenicidade , NAD/metabolismo , Fosforilases/química , Fosforilases/genética , Conformação Proteica , Sistemas Toxina-Antitoxina/genética , Tuberculose/tratamento farmacológicoRESUMO
Mycobacterium tuberculosis (Mtb) is the etiological agent of tuberculosis. One-fourth of the global population is estimated to be infected with Mtb, accounting for â¼1.3 million deaths in 2017. As part of the immune response to Mtb infection, macrophages produce metabolites with the purpose of inhibiting or killing the bacterial cell. Itaconate is an abundant host metabolite thought to be both an antimicrobial agent and a modulator of the host inflammatory response. However, the exact mode of action of itaconate remains unclear. Here, we show that Mtb has an itaconate dissimilation pathway and that the last enzyme in this pathway, Rv2498c, also participates in l-leucine catabolism. Our results from phylogenetic analysis, in vitro enzymatic assays, X-ray crystallography, and in vivo Mtb experiments, identified Mtb Rv2498c as a bifunctional ß-hydroxyacyl-CoA lyase and that deletion of the rv2498c gene from the Mtb genome resulted in attenuation in a mouse infection model. Altogether, this report describes an itaconate resistance mechanism in Mtb and an l-leucine catabolic pathway that proceeds via an unprecedented (R)-3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) stereospecific route in nature.
Assuntos
Leucina/metabolismo , Mycobacterium tuberculosis/enzimologia , Mycobacterium tuberculosis/metabolismo , Succinatos/metabolismo , Aerossóis , Animais , Biocatálise , Ligantes , Liases/metabolismo , Malatos/metabolismo , Camundongos Endogâmicos C57BL , Filogenia , Proteínas Recombinantes/metabolismo , Estereoisomerismo , Tuberculose/microbiologia , Tuberculose/patologiaRESUMO
Characterizing the mycobacterial transporters involved in the uptake and/or catabolism of host-derived nutrients required by mycobacteria may identify novel drug targets against tuberculosis. Here, we identify and characterize a member of the amino acid-polyamine-organocation superfamily, a potential γ-aminobutyric acid (GABA) transport protein, GabP, from Mycobacterium smegmatis The protein was expressed to a level allowing its purification to homogeneity, and size exclusion chromatography coupled with multiangle laser light scattering (SEC-MALLS) analysis of the purified protein showed that it was dimeric. We showed that GabP transported γ-aminobutyric acid both in vitro and when overexpressed in E. coli Additionally, transport was greatly reduced in the presence of ß-alanine, suggesting it could be either a substrate or inhibitor of GabP. Using GabP reconstituted into proteoliposomes, we demonstrated that γ-aminobutyric acid uptake is driven by the sodium gradient and is stimulated by membrane potential. Molecular docking showed that γ-aminobutyric acid binds MsGabP, another Mycobacterium smegmatis putative GabP, and the Mycobacterium tuberculosis homologue in the same manner. This study represents the first expression, purification, and characterization of an active γ-aminobutyric acid transport protein from mycobacteria.IMPORTANCE The spread of multidrug-resistant tuberculosis increases its global health impact in humans. As there is transmission both to and from animals, the spread of the disease also increases its effects in a broad range of animal species. Identifying new mycobacterial transporters will enhance our understanding of mycobacterial physiology and, furthermore, provides new drug targets. Our target protein is the gene product of msmeg_6196, annotated as GABA permease, from Mycobacterium smegmatis strain MC2 155. Our current study demonstrates it is a sodium-dependent GABA transporter that may also transport ß-alanine. As GABA may well be an essential nutrient for mycobacterial metabolism inside the host, this could be an attractive target for the development of new drugs against tuberculosis.
Assuntos
Proteínas de Bactérias/metabolismo , Transporte Biológico/fisiologia , Proteínas da Membrana Plasmática de Transporte de GABA/metabolismo , Mycobacterium smegmatis/metabolismo , Transportadores de Ânions Orgânicos/metabolismo , Sódio/metabolismo , Ácido gama-Aminobutírico/metabolismo , Proteínas de Bactérias/genética , Escherichia coli/genética , Escherichia coli/metabolismo , Proteínas de Escherichia coli , Proteínas da Membrana Plasmática de Transporte de GABA/genética , Regulação Bacteriana da Expressão Gênica , Metabolômica , Simulação de Acoplamento Molecular , Transportadores de Ânions Orgânicos/genética , Filogenia , Ácido gama-Aminobutírico/química , Ácido gama-Aminobutírico/genéticaRESUMO
Methionine adenosyltransferase (MAT) catalyzes the adenosine 5'-triphosphate (ATP) and l-methionine (l-Met) dependent formation of S-adenosyl-l-methionine (SAM), the principal methyl donor of most biological transmethylation reactions. We carried out in-depth kinetic studies to further understand its mechanism and interaction with a potential regulator, Mat2B. The initial velocity pattern and results of product inhibition by SAM, phosphate, and pyrophosphate, and dead-end inhibition by the l-Met analog cycloleucine (l-cLeu) suggest that Mat2A follows a strictly ordered kinetic mechanism where ATP binds before l-Met and with SAM released prior to random release of phosphate and pyrophosphate. Isothermal titration calorimetry (ITC) showed binding of ATP to Mat2A with a Kd of 80 ± 30 µM, which is close to the Km(ATP) of 50 ± 10 µM. In contrast, l-Met or l-cLeu showed no binding to Mat2A in the absence of ATP; however, binding to l-cLeu was observed in the presence of ATP. The ITC results are fully consistent with the product and dead-inhibition results obtained. We also carried out kinetic studies in the presence of the physiological regulator Mat2B. Under conditions where all Mat2A is found in complex with Mat2B, no significant change in the kinetic parameters was observed despite confirmation of a very high binding affinity of Mat2A to Mat2B (Kd of 6 ± 1 nM). Finally, we found that while Mat2A is unstable at low concentrations (<100 nM), rapidly losing activity at 37 °C, it retained full activity for at least 2 h when Mat2B was present at the known 2:1 Mat2A/Mat2B stoichiometry.
Assuntos
Metionina Adenosiltransferase/metabolismo , Trifosfato de Adenosina/metabolismo , Estabilidade Enzimática , Humanos , Cinética , Metionina/metabolismo , Metionina Adenosiltransferase/genética , Metionina Adenosiltransferase/isolamento & purificação , Proteínas Recombinantes/genética , Proteínas Recombinantes/isolamento & purificação , Proteínas Recombinantes/metabolismo , S-Adenosilmetionina/metabolismoRESUMO
Upon host infection, Mycobacterium tuberculosis secretes the tuberculosis necrotizing toxin (TNT) into the cytosol of infected macrophages, leading to host cell death by necroptosis. TNT hydrolyzes NAD+ in the absence of any exogenous cofactor, thus classifying it as a ß-NAD+ glycohydrolase. However, TNT lacks sequence similarity with other NAD+ hydrolyzing enzymes and lacks the essential motifs involved in NAD+ binding and hydrolysis by these enzymes. In this study, we used NMR to examine the enzymatic activity of TNT and found that TNT hydrolyzes NADP+ as fast as NAD+ but does not cleave the corresponding reduced dinucleotides. This activity of TNT was not inhibited by ADP-ribose or nicotinamide, indicating low affinity of TNT for these reaction products. A selection assay for nontoxic TNT variants in Escherichia coli identified four of six residues in the predicted NAD+-binding pocket and four glycine residues that form a cradle directly below the NAD+-binding site, a conserved feature in the TNT protein family. Site-directed mutagenesis of residues near the predicted NAD+-binding site revealed that Phe727, Arg757, and Arg780 are essential for NAD+ hydrolysis by TNT. These results identify the NAD+-binding site of TNT. Our findings also show that TNT is an NAD+ glycohydrolase with properties distinct from those of other bacterial glycohydrolases. Because many of these residues are conserved within the TNT family, our findings provide insights into understanding the function of the >300 TNT homologs.
Assuntos
Toxinas Bacterianas/metabolismo , Mycobacterium tuberculosis/metabolismo , NAD+ Nucleosidase/metabolismo , Sequência de Aminoácidos , Toxinas Bacterianas/química , Hidrólise , Espaço Intracelular/microbiologia , Modelos Moleculares , Mycobacterium tuberculosis/fisiologia , NAD/metabolismo , NADP/metabolismo , Conformação Proteica , Domínios ProteicosRESUMO
Functional assignment of enzymes encoded by the Mycobacterium tuberculosis genome is largely incomplete despite recent advances in genomics and bioinformatics. Here, we applied an activity-based metabolomic profiling method to assign function to a unique phosphatase, Rv1692. In contrast to its annotation as a nucleotide phosphatase, metabolomic profiling and kinetic characterization indicate that Rv1692 is a D,L-glycerol 3-phosphate phosphatase. Crystal structures of Rv1692 reveal a unique architecture, a fusion of a predicted haloacid dehalogenase fold with a previously unidentified GCN5-related N-acetyltransferase region. Although not directly involved in acetyl transfer, or regulation of enzymatic activity in vitro, this GCN5-related N-acetyltransferase region is critical for the solubility of the phosphatase. Structural and biochemical analysis shows that the active site features are adapted for recognition of small polyol phosphates, and not nucleotide substrates. Functional assignment and metabolomic studies of M. tuberculosis lacking rv1692 demonstrate that Rv1692 is the final enzyme involved in glycerophospholipid recycling/catabolism, a pathway not previously described in M. tuberculosis.
Assuntos
Glicerofosfolipídeos/metabolismo , Mycobacterium tuberculosis/enzimologia , Monoéster Fosfórico Hidrolases/metabolismo , Domínio Catalítico , Modelos Moleculares , Monoéster Fosfórico Hidrolases/química , SolubilidadeRESUMO
Here we identify the amino acid transporter AnsP1 as the unique aspartate importer in the human pathogen Mycobacterium tuberculosis. Metabolomic analysis of a mutant with an inactive AnsP1 revealed that the transporter is essential for M. tuberculosis to assimilate nitrogen from aspartate. Virulence of the AnsP1 mutant is impaired in vivo, revealing that aspartate is a primary nitrogen source required for host colonization by the tuberculosis bacillus.
Assuntos
Ácido Aspártico/metabolismo , Mycobacterium tuberculosis/metabolismo , Nitrogênio/metabolismo , Transportador 1 de Aminoácido Excitatório/genética , Transportador 1 de Aminoácido Excitatório/metabolismoRESUMO
Many anti-infectives inhibit the synthesis of bacterial proteins, but none selectively inhibits their degradation. Most anti-infectives kill replicating pathogens, but few preferentially kill pathogens that have been forced into a non-replicating state by conditions in the host. To explore these alternative approaches we sought selective inhibitors of the proteasome of Mycobacterium tuberculosis. Given that the proteasome structure is extensively conserved, it is not surprising that inhibitors of all chemical classes tested have blocked both eukaryotic and prokaryotic proteasomes, and no inhibitor has proved substantially more potent on proteasomes of pathogens than of their hosts. Here we show that certain oxathiazol-2-one compounds kill non-replicating M. tuberculosis and act as selective suicide-substrate inhibitors of the M. tuberculosis proteasome by cyclocarbonylating its active site threonine. Major conformational changes protect the inhibitor-enzyme intermediate from hydrolysis, allowing formation of an oxazolidin-2-one and preventing regeneration of active protease. Residues outside the active site whose hydrogen bonds stabilize the critical loop before and after it moves are extensively non-conserved. This may account for the ability of oxathiazol-2-one compounds to inhibit the mycobacterial proteasome potently and irreversibly while largely sparing the human homologue.
Assuntos
Mycobacterium tuberculosis/efeitos dos fármacos , Mycobacterium tuberculosis/enzimologia , Inibidores de Proteases/farmacologia , Inibidores de Proteassoma , Domínio Catalítico/efeitos dos fármacos , Humanos , Ligação de Hidrogênio , Cinética , Modelos Moleculares , Mycobacterium tuberculosis/crescimento & desenvolvimento , Oxazolidinonas/metabolismo , Oxazolidinonas/farmacologia , Inibidores de Proteases/química , Complexo de Endopeptidases do Proteassoma/química , Complexo de Endopeptidases do Proteassoma/metabolismo , Carbonilação Proteica/efeitos dos fármacos , Conformação Proteica/efeitos dos fármacos , Subunidades Proteicas , Especificidade por Substrato , Tiazóis/farmacologia , Treonina/metabolismoRESUMO
The halo-acid dehalogenase (HAD) superfamily comprises a large number of enzymes that share a conserved core domain responsible for a diverse array of chemical transformations (e.g., phosphonatase, dehalogenase, phosphohexomutase, and phosphatase) and a cap domain that controls substrate specificity. Phosphate hydrolysis is thought to proceed via an aspartyl-phosphate intermediate, and X-ray crystallography has shown that protein active site conformational changes are required for catalytic competency. Using a combination of steady-state and pre-steady-state kinetics, pL-rate studies, solvent kinetic isotope effects, (18)O molecular isotope exchange, and partition experiments, we provide a detailed description of the chemical mechanism of a glycerol 3-phosphate phosphatase. This phosphatase has been recently recognized as a rate-limiting factor in lipid polar head recycling in Mycobacterium tuberculosis [Larrouy-Maumus, G., et al. (2013) Proc. Natl. Acad. Sci. 110 (28), 11320-11325]. Our results clearly establish the existence of an aspartyl-phosphate intermediate in this newly discovered member of the HAD superfamily. No ionizable groups are rate-limiting from pH 5.5 to 9.5, consistent with the pK values of the catalytic aspartate residues. The formation and decay of this intermediate are partially rate-limiting below pH 7.0, and a conformational change preceding catalysis is rate-limiting above pH 7.0.
Assuntos
Monoéster Fosfórico Hidrolases/metabolismo , Ácido Aspártico/análogos & derivados , Ácido Aspártico/metabolismo , Sítios de Ligação , Catálise , Glicerofosfatos/metabolismo , Concentração de Íons de Hidrogênio , Cinética , Modelos Químicos , Solventes/farmacologia , Especificidade por Substrato , ViscosidadeRESUMO
Tumors are intrinsically heterogeneous and it is well established that this directs their evolution, hinders their classification and frustrates therapy1-3. Consequently, spatially resolved omics-level analyses are gaining traction4-9. Despite considerable therapeutic interest, tumor metabolism has been lagging behind this development and there is a paucity of data regarding its spatial organization. To address this shortcoming, we set out to study the local metabolic effects of the oncogene c-MYC, a pleiotropic transcription factor that accumulates with tumor progression and influences metabolism10,11. Through correlative mass spectrometry imaging, we show that pantothenic acid (vitamin B5) associates with MYC-high areas within both human and murine mammary tumors, where its conversion to coenzyme A fuels Krebs cycle activity. Mechanistically, we show that this is accomplished by MYC-mediated upregulation of its multivitamin transporter SLC5A6. Notably, we show that SLC5A6 over-expression alone can induce increased cell growth and a shift toward biosynthesis, whereas conversely, dietary restriction of pantothenic acid leads to a reversal of many MYC-mediated metabolic changes and results in hampered tumor growth. Our work thus establishes the availability of vitamins and cofactors as a potential bottleneck in tumor progression, which can be exploited therapeutically. Overall, we show that a spatial understanding of local metabolism facilitates the identification of clinically relevant, tractable metabolic targets.
Assuntos
Neoplasias da Mama , Humanos , Camundongos , Animais , Feminino , Neoplasias da Mama/metabolismo , Ácido Pantotênico , Proteínas Proto-Oncogênicas c-myc/genética , Proteínas Proto-Oncogênicas c-myc/metabolismo , Fatores de Transcrição/metabolismo , VitaminasRESUMO
MtATP-phosphoribosyltransferase catalyzes the first and committed step in l-histidine biosynthesis in Mycobacterium tuberculosis and is therefore subjected to allosteric feedback regulation. Because of its essentiality, this enzyme is being studied as a potential target for novel anti-infectives. To understand the basis for its regulation, we characterized the allosteric inhibition using gel filtration, steady-state and pre-steady-state kinetics, and the pH dependence of inhibition and binding. Gel filtration experiments indicate that MtATP-phosphoribosyltransferase is a hexamer in solution, in the presence or absence of l-histidine. Steady-state kinetic studies demonstrate that l-histidine inhibition is uncompetitive versus ATP and noncompetitive versus PRPP. At pH values close to neutrality, a K(ii) value of 4 µM was obtained for l-histidine. Pre-steady-state kinetic experiments indicate that chemistry is not rate-limiting for the overall reaction and that l-histidine inhibition is caused by trapping the enzyme in an inactive conformation. The pH dependence of binding, obtained by nuclear magnetic resonance, indicates that l-histidine binds better as the neutral α-amino group. The pH dependence of inhibition (K(ii)), on the contrary, indicates that l-histidine better inhibits MtATP-phosphoribosytransferase with a neutral imidazole and an ionized α-amino group. These results are combined into a model that accounts for the allosteric inhibition of MtATP-phosphoribosyltransferase.
Assuntos
ATP Fosforribosiltransferase/antagonistas & inibidores , Retroalimentação Fisiológica/fisiologia , Regulação Enzimológica da Expressão Gênica/fisiologia , Mycobacterium tuberculosis/enzimologia , ATP Fosforribosiltransferase/metabolismo , Escherichia coli/genética , Escherichia coli/metabolismo , Regulação Bacteriana da Expressão Gênica , Histidina/metabolismo , Concentração de Íons de Hidrogênio , Cinética , Estrutura Molecular , Mycobacterium tuberculosis/genéticaRESUMO
In this issue of JEM, Reinink et al. (https://doi.org/10.1084/jem.20181812) use comparative lipidomics to identify a new family of trehalose-containing cell wall lipids that are enriched in virulent Salmonella serovars. These lipids are structurally related to the important mycobacterial immunogen cord factor.
Assuntos
Mycobacterium , Trealose , Fosfolipídeos , SalmonellaRESUMO
Bacterial metabolism is fundamental to survival and pathogenesis. We explore how Mycobacterium tuberculosis utilises amino acids as nitrogen sources, using a combination of bacterial physiology and stable isotope tracing coupled to mass spectrometry metabolomics methods. Our results define core properties of the nitrogen metabolic network from M. tuberculosis, such as: (i) the lack of homeostatic control of certain amino acid pool sizes; (ii) similar rates of utilisation of different amino acids as sole nitrogen sources; (iii) improved nitrogen utilisation from amino acids compared to ammonium; and (iv) co-metabolism of nitrogen sources. Finally, we discover that alanine dehydrogenase is involved in ammonium assimilation in M. tuberculosis, in addition to its essential role in alanine utilisation as a nitrogen source. This study represents the first in-depth analysis of nitrogen source utilisation by M. tuberculosis and reveals a flexible metabolic network with characteristics that are likely a product of evolution in the human host.
Assuntos
Mycobacterium tuberculosis/metabolismo , Mycobacterium tuberculosis/patogenicidade , Nitrogênio/metabolismo , Alanina Desidrogenase/metabolismo , Aminoácidos/metabolismo , Compostos de Amônio/farmacologia , Cinética , Redes e Vias Metabólicas/efeitos dos fármacos , Mycobacterium tuberculosis/efeitos dos fármacos , Mycobacterium tuberculosis/crescimento & desenvolvimento , Nitrogênio/farmacologiaRESUMO
MtATP-phosphoribosyltransferase (MtATP-PRT) is an enzyme catalyzing the first step of the biosynthesis of L-histidine in Mycobacterium tuberculosis, and proposed to be regulated via an allosteric mechanism. Native mass spectrometry (MS) reveals MtATP-PRT to exist as a hexamer. Conformational changes induced by L-histidine binding and the influence of buffer pH are determined with ion mobility MS, hydrogen deuterium exchange (HDX) MS, and analytical ultracentrifugation. The experimental collision cross-section (DTCCSHe) decreases from 76.6 to 73.5 nm2 upon ligand binding at pH 6.8, which correlates to the decrease in CCS calculated from crystal structures. No such changes in conformation were found at pH 9.0. Further detail on the regions that exhibit conformational change on L-histidine binding is obtained with HDX-MS experiments. On incubation with L-histidine, rapid changes are observed within domain III, and around the active site at longer times, indicating an allosteric effect.
Assuntos
ATP Fosforribosiltransferase/química , Sítio Alostérico , Proteínas de Bactérias/química , ATP Fosforribosiltransferase/metabolismo , Regulação Alostérica , Proteínas de Bactérias/metabolismo , Retroalimentação Fisiológica , Histidina/química , Histidina/metabolismo , Espectrometria de Massas/métodos , Mycobacterium tuberculosis/enzimologia , Ligação ProteicaRESUMO
The human pathogen Mycobacterium tuberculosis (Mtb) likely utilizes host fatty acids as a carbon source during infection. Gluconeogenesis is essential for the conversion of fatty acids into biomass. A rate-limiting step in gluconeogenesis is the conversion of fructose 1,6-bisphosphate to fructose 6-phosphate by a fructose bisphosphatase (FBPase). The Mtb genome contains only one annotated FBPase gene, glpX. Here we show that, unexpectedly, an Mtb mutant lacking GLPX grows on gluconeogenic carbon sources and has detectable FBPase activity. We demonstrate that the Mtb genome encodes an alternative FBPase (GPM2, Rv3214) that can maintain gluconeogenesis in the absence of GLPX. Consequently, deletion of both GLPX and GPM2 is required for disruption of gluconeogenesis and attenuation of Mtb in a mouse model of infection. Our work affirms a role for gluconeogenesis in Mtb virulence and reveals previously unidentified metabolic redundancy at the FBPase-catalysed reaction step of the pathway.
Assuntos
Frutose-Bifosfatase/metabolismo , Gluconeogênese , Mycobacterium tuberculosis/enzimologia , Lítio , Mycobacterium tuberculosis/patogenicidade , VirulênciaRESUMO
Recent advances in liquid chromatography and mass spectrometry have enabled the highly parallel, quantitative measurement of metabolites within a cell and the ability to trace their biochemical fates. In Mycobacterium tuberculosis (Mtb), these advances have highlighted major gaps in our understanding of central carbon metabolism (CCM) that have prompted fresh interpretations of the composition and structure of its metabolic pathways and the phenotypes of Mtb strains in which CCM genes have been deleted. High-throughput screens have demonstrated that small chemical compounds can selectively inhibit some enzymes of Mtb's CCM while sparing homologs in the host. Mtb's CCM has thus emerged as a frontier for both fundamental and translational research.
Assuntos
Carbono/metabolismo , Genes Bacterianos , Mycobacterium tuberculosis/metabolismo , Antibacterianos , Vias Biossintéticas , Biologia Computacional , Evolução Molecular , Genômica , Metabolômica , Mycobacterium tuberculosis/enzimologia , Mycobacterium tuberculosis/genéticaRESUMO
How we develop antibiotics is shaped by how we view infectious disease. Given the urgent need for new chemotherapeutics for tuberculosis and other infectious diseases, it is timely to reconsider a view of infectious disease that is strongly supported by contemporary evidence but that has rarely been applied in antibiotic development. This view recognizes the importance of nonreplicating bacteria in persistent infections, acknowledges the heterogeneity and stringency of chemical environments encountered by the pathogen in the host, and emphasizes metabolic adaptation of the host and the pathogen during their competition. For example, efforts in our lab are guided by the perspective that Mycobacterium tuberculosis (Mtb) has co-evolved with the human immune response, with the result that Mtb turns host-imposed metabolic adversity to its own advantage. We seek chemotherapeutics that turn Mtb's adversity to the host's advantage.
Assuntos
Antituberculosos/uso terapêutico , Filosofia Médica , Tuberculose/tratamento farmacológico , Antibacterianos/uso terapêutico , Antituberculosos/farmacologia , Doenças Transmissíveis/tratamento farmacológico , Doenças Transmissíveis/microbiologia , Interações Hospedeiro-Patógeno , Humanos , Mycobacterium tuberculosis/efeitos dos fármacos , Mycobacterium tuberculosis/fisiologia , Tuberculose/microbiologiaRESUMO
The Gcn5-related N-acetyltransferases (GNAT) comprise one of the largest enzyme superfamilies, with over 10 000 known members represented in all kingdoms of life. ChloroacetylCoenzymeA was prepared and demonstrated to be a substrate for several GNAT members. ChloroacetylCoA (ClAcCoA) is used by the Hat1 histone acetyltransferase to correctly acetylate histone H4 in a mixture of histone proteins. Chloroacetylation can be assessed by the subsequent reaction of the chloroacetylated product with thiol-containing compounds, including those with fluorescent or affinity (His8) tags. The bacterial RimL N-acetyltransferase also uses ClAcCoA to chloroacetyl the alpha-amino group of its cognate substrate, the ribosomal L12 protein, and this reaction can be observed in crude extracts. ChloroacetylCoA is a reagent that can be used to identify the unknown substrate(s) for this large family of functionally uncharacterized enzymes.