The authors would like to thank all members of the laboratories of Dr. Barletta and Dr. Powers for helpful comments while developing the protocol. We thank Wendy Austin for helpful discussions and proofreading of the manuscript. The work described in this manuscript was funded by seed pilot grants to each investigator listed above from the University of Nebraska-Lincoln Redox Biology Center (parent grant #NCRR 2P20RR 017675, D. Becker, P.I.). In addition, we thank Dr. Ofelia Chacon for providing funds from her R21 grant (1R21AI087561-01A1) for research supplies and Mr. Halouska's partial salary support to standardize NMR techniques included in this publication.

1. Protocol Text
This protocol highlights the adaption of NMR methodology to M. tuberculosis (Class III agent). Therefore, Biosafety Level 3 (BSL3) practices need to be followed when conducting M. tuberculosis research in an annually certified laboratory. Exposure to laboratory-generated aerosols is the most important hazard encountered by personnel working with these microorganisms. The following procedures are conducted at our institution and variations may exist based on the...

<ol>
	<li>Larsen, M. H., Biermann, K., Tandberg, S., Hsu, T., Jacobs, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+Manipulation+of+Mycobacterium+tuberculosis.">Genetic Manipulation of Mycobacterium tuberculosis.</a> Curr. Protoc. Microbiol. Chapter 10, 2 (2007).</li><li>Larsen, M. H., Biermann, K., Jacobs, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Laboratory+Maintenance+of+Mycobacterium+tuberculosis.">Laboratory Maintenance of Mycobacterium tuberculosis.</a> Curr. Protoc. Microbiol. Chapter 10, 1 (2007).</li><li>Clarridge, J. E., Shawar, R. M., Shinnick, T. M., Plikaytis, B. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Large-scale+use+of+polymerase+chain+reaction+for+detection+of+Mycobacterium+tuberculosis+in+a+routine+mycobacteriology+laboratory.">Large-scale use of polymerase chain reaction for detection of Mycobacterium tuberculosis in a routine mycobacteriology laboratory.</a> J. Clin. Microbiol. 31, 2049-2056 (1993).</li><li>Nguyen, B. D., Meng, X., Donovan, K. J., Shaka, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=SOGGY:+solvent-optimized+double+gradient+spectroscopy+for+water+suppression.+A+comparison+with+some+existing+techniques.">SOGGY: solvent-optimized double gradient spectroscopy for water suppression. A comparison with some existing techniques.</a> J. Magn. Reson. 184, 263-274 (2007).</li><li>Cui, Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabolite+identification+via+the+Madison+Metabolomics+Consortium+Database.">Metabolite identification via the Madison Metabolomics Consortium Database.</a> Nat. Biotechnol. 26, 162-164 (2008).</li><li>Ulrich, E. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=BioMagResBank.">BioMagResBank.</a> Nucleic Acids Res. 36, 402-408 (2008).</li><li>Wishart, D. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=HMDB:+the+Human+Metabolome+Database.">HMDB: the Human Metabolome Database.</a> Nucleic Acids Res. 35, 521-526 (2007).</li><li>Kanehisa, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=KEGG+for+linking+genomes+to+life+and+the+environment.">KEGG for linking genomes to life and the environment.</a> Nucleic Acids Res. 36, 480-484 (2008).</li><li>Karp, P. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expansion+of+the+BioCyc+collection+of+pathway/genome+databases+to+160+genomes.">Expansion of the BioCyc collection of pathway/genome databases to 160 genomes.</a> Nucleic Acids Res. 33, 6083-6089 (2005).</li><li>Halouska, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+NMR+metabolomics+to+analyze+the+targets+of+D-cycloserine+in+mycobacteria:+role+of+D-alanine+racemase.">Use of NMR metabolomics to analyze the targets of D-cycloserine in mycobacteria: role of D-alanine racemase.</a> J. Proteome. Res. 6, 4608-4614 (2007).</li><li>Boshoff, H. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+transcriptional+responses+of+Mycobacterium+tuberculosis+to+inhibitors+of+metabolism:+novel+insights+into+drug+mechanisms+of+action.">The transcriptional responses of Mycobacterium tuberculosis to inhibitors of metabolism: novel insights into drug mechanisms of action.</a> J. Biol. Chem. 279, 40174-40184 (2004).</li><li>Mehaffy, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Descriptive+proteomic+analysis+shows+protein+variability+between+closely+related+clinical+isolates+of+Mycobacterium+tuberculosis.">Descriptive proteomic analysis shows protein variability between closely related clinical isolates of Mycobacterium tuberculosis.</a> Proteomics. 10, 1966-1984 (2010).</li><li>Schnappinger, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transcriptional+Adaptation+of+Mycobacterium+tuberculosis+within+Macrophages:+Insights+into+the+Phagosomal+Environment.">Transcriptional Adaptation of Mycobacterium tuberculosis within Macrophages: Insights into the Phagosomal Environment.</a> J. Exp. Med. 198, 693-704 (2003).</li><li>Schnappinger, D., Schoolnik, G. K., Ehrt, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expression+profiling+of+host+pathogen+interactions:+how+Mycobacterium+tuberculosis+and+the+macrophage+adapt+to+one+another.">Expression profiling of host pathogen interactions: how Mycobacterium tuberculosis and the macrophage adapt to one another.</a> Microbes. Infect. 8, 1132-1140 (2006).</li><li>Shui, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+proteomic+profiling+of+host-pathogen+interactions:+the+macrophage+response+to+Mycobacterium+tuberculosis+lipids.">Quantitative proteomic profiling of host-pathogen interactions: the macrophage response to Mycobacterium tuberculosis lipids.</a> J. Proteome. Res. 8, 282-289 (2009).</li><li>Talaat, A. M., Lyons, R., Howard, S. T., Johnston, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+temporal+expression+profile+of+Mycobacterium+tuberculosis+infection+in+mice.">The temporal expression profile of Mycobacterium tuberculosis infection in mice.</a> Proc. Natl. Acad. Sci. U.S.A. 101, 4602-4607 (2004).</li><li>Forgue, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=NMR+metabolic+profiling+of+Aspergillus+nidulans+to+monitor+drug+and+protein+activity.">NMR metabolic profiling of Aspergillus nidulans to monitor drug and protein activity.</a> J. Proteome Res. 5, 1916-1923 (2006).</li><li>Goodacre, R., Vaidyanathan, S., Dunn, W. B., Harrigan, G. G., Kell, D. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabolomics+by+numbers:+acquiring+and+understanding+global+metabolite+data.">Metabolomics by numbers: acquiring and understanding global metabolite data.</a> Trends Biotechnol. 22, 245-252 (2004).</li><li>Shin, J. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=NMR-based+Metabolomic+Profiling+in+Mice+Infected+with+Mycobacterium+tuberculosis.">NMR-based Metabolomic Profiling in Mice Infected with Mycobacterium tuberculosis.</a> J. Proteome Res. 10, 2238-2247 (2011).</li><li>Jaki, B. U., Franzblau, S. G., Cho, S. H., Pauli, G. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+an+extraction+method+for+mycobacterial+metabolome+analysis.">Development of an extraction method for mycobacterial metabolome analysis.</a> J. Pharm. Biomed. Anal. 41, 196-200 (2006).</li><li>de Carvalho, L. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabolomics+of+Mycobacterium+tuberculosis+reveals+compartmentalized+co-catabolism+of+carbon+substrates.">Metabolomics of Mycobacterium tuberculosis reveals compartmentalized co-catabolism of carbon substrates.</a> Chem. Biol. 17, 1122-1131 (2010).</li><li>de Carvalho, L. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Activity-based+metabolomic+profiling+of+enzymatic+function:+identification+of+Rv1248c+as+a+mycobacterial+2-hydroxy-3-oxoadipate+synthase.">Activity-based metabolomic profiling of enzymatic function: identification of Rv1248c as a mycobacterial 2-hydroxy-3-oxoadipate synthase.</a> Chem. Biol. 17, 323-332 (2010).</li><li>Marrero, J., Rhee, K. Y., Schnappinger, D., Pethe, K., Ehrt, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gluconeogenic+carbon+flow+of+tricarboxylic+acid+cycle+intermediates+is+critical+for+Mycobacterium+tuberculosis+to+establish+and+maintain+infection.">Gluconeogenic carbon flow of tricarboxylic acid cycle intermediates is critical for Mycobacterium tuberculosis to establish and maintain infection.</a> Proc. Natl. Acad. Sci. U.S.A. 107, 9819-9824 (2010).</li><li>Tang, Y. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Central+metabolism+in+Mycobacterium+smegmatis+during+the+transition+from+O2-rich+to+O2-poor+conditions+as+studied+by+isotopomer-assisted+metabolite+analysis.">Central metabolism in Mycobacterium smegmatis during the transition from O2-rich to O2-poor conditions as studied by isotopomer-assisted metabolite analysis.</a> Biotechnol. Lett. 31, 1233-1240 (2009).</li><li>Kweon, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+polyomic+approach+to+elucidate+the+fluoranthene-degradative+pathway+in+Mycobacterium+vanbaalenii+PYR-1.">A polyomic approach to elucidate the fluoranthene-degradative pathway in Mycobacterium vanbaalenii PYR-1.</a> J. Bacteriol. 189, 4635-4647 (2007).</li><li>Hasan, M. R., Rahman, M., Jaques, S., Purwantini, E., Daniels, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Glucose+6-phosphate+accumulation+in+mycobacteria:+implications+for+a+novel+F420-dependent+anti-oxidant+defense+system.">Glucose 6-phosphate accumulation in mycobacteria: implications for a novel F420-dependent anti-oxidant defense system.</a> J. Biol. Chem. 285, 19135-19144 (2010).</li><li>Soga, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+metabolome+analysis+using+capillary+electrophoresis+mass+spectrometry.">Quantitative metabolome analysis using capillary electrophoresis mass spectrometry.</a> J. Proteome Res. 2, 488-494 (2003).</li><li>Metz, T. O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+future+of+liquid+chromatography-mass+spectrometry+(LC-MS)+in+metabolic+profiling+and+metabolomic+studies+for+biomarker+discovery.">The future of liquid chromatography-mass spectrometry (LC-MS) in metabolic profiling and metabolomic studies for biomarker discovery.</a> Biomark Med. 1, 159-185 (2007).</li><li>Ludwig, C., Viant, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-dimensional+J-resolved+NMR+spectroscopy:+review+of+a+key+methodology+in+the+metabolomics+toolbox.">Two-dimensional J-resolved NMR spectroscopy: review of a key methodology in the metabolomics toolbox.</a> Phytochem. Anal. 21, 22-32 (2010).</li><li>Simpson, R. J., Inglis, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Proteins and Proteomics: A Laboratory Manual. , 425-595 (2003).</li><li>Beste, D. J., McFadden, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=System-level+strategies+for+studying+the+metabolism+of+Mycobacterium+tuberculosis.">System-level strategies for studying the metabolism of Mycobacterium tuberculosis.</a> Mol. Biosyst. 6, 2363-2372 (2010).</li><li>Rhee, K. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Central+carbon+metabolism+in+Mycobacterium+tuberculosis:+an+unexpected+frontier.">Central carbon metabolism in Mycobacterium tuberculosis: an unexpected frontier.</a> Trends Microbiol. , (2011).</li><li>Who. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Health+Organization.">Health Organization.</a> Anti-tuberculosis Drug Resistance in the World: Report No. 4. , (2008).</li><li>Jassal, M., Bishai, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Extensively+drug-resistant+tuberculosis.">Extensively drug-resistant tuberculosis.</a> Lancet Infect Dis. 9, 19-30 (2009).</li></ol>

No conflicts of interest declared.

A significant number of studies have analyzed the transcriptomic and proteomic profiles of M. tuberculosis under a variety of in vitro and in vivo conditions.11-16 Ultimately, changes in gene expression and enzyme activity lead to variations in the concentrations of small molecular weight molecules. The complete description of these compounds constitutes the metabolome. Thus, the effects of drugs and varying growth conditions on metabolic pathways may be followed by metabolomic analy...

<table border="1">
 <tbody>
 <tr>
 <td>Name of the Reagent/Equipment</td>
 <td>Company</td>
 <td>Catalogue Number</td>
 <td>Comments </td>
 </tr>
 <tr>
 <td>ADC Enrichment</td>
 <td>BD BBL Middlebrook</td>
 <td>212352</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>BACS-120 Sample Changer</td>
 <td>Bruker</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Bruker Avance NMR</td>
 <td>Bruker</td>
 <td>&nbsp;</td>
 <td>500 MHz</td>
 </tr>
 <tr>
 <td>Bovine Serum Albumin</td>
 <td>Fisher Scientific</td>
 <td>BP1600-100</td>
 <td>Fraction V</td>
 </tr>
 <tr>
 <td>Centrifuge</td>
 <td>Beckman Coulter</td>
 <td>Allegra X-15R</td>
 <td>Benchtop</td>
 </tr>
 <tr>
 <td>Centrifuge Tubes</td>
 <td>Corning</td>
 <td>430291</td>
 <td>50 ml sterile polypropylene</td>
 </tr>
 <tr>
 <td>Cryogenic Vials</td>
 <td>Corning</td>
 <td>430488</td>
 <td>2.0 ml sterile polypropylene</td>
 </tr>
 <tr>
 <td>Cycloheximide</td>
 <td>A.G. Scientific</td>
 <td>C-1189</td>
 <td>Toxic</td>
 </tr>
 <tr>
 <td>D(+) - Glucose</td>
 <td>ACROS</td>
 <td>41095-0010</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Deuterium Oxide</td>
 <td>Sigma Aldrich</td>
 <td>617385</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Erlenmeyer Flask</td>
 <td>VWR</td>
 <td>89095-266</td>
 <td>Sterile, flat base, polycarbonate, 0.22 &mu;m PTFE membrane vented cap</td>
 </tr>
 <tr>
 <td>Flash Freeze Flask</td>
 <td>VWR</td>
 <td>82018-226</td>
 <td>750 ml</td>
 </tr>
 <tr>
 <td>Freeze Dryer</td>
 <td>VWR</td>
 <td>82019-038</td>
 <td>4.5 L Benchtop</td>
 </tr>
 <tr>
 <td>Glycerol</td>
 <td>GibcoBRL</td>
 <td>15514-029</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Incubator</td>
 <td>New Brunswick</td>
 <td>Innova 40</td>
 <td>Benchtop shaker</td>
 </tr>
 <tr>
 <td>Lysing Matrix B</td>
 <td>MP Biomedicals</td>
 <td>6911-100</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Lysis Machine</td>
 <td>MP Biomedicals</td>
 <td>FastPrep-24</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Microcentrifuge</td>
 <td>Eppendorf</td>
 <td>5415D</td>
 <td>Benchtop</td>
 </tr>
 <tr>
 <td>Microcentrifuge</td>
 <td>Beckman Coulter</td>
 <td>Microfuge 22R</td>
 <td>Benchtop</td>
 </tr>
 <tr>
 <td>Middlebrook 7H9 Broth</td>
 <td>Difco</td>
 <td>271310</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>NMR tubes</td>
 <td>Norell</td>
 <td>ST500-7</td>
 <td>5mM</td>
 </tr>
 <tr>
 <td>OADC Enrichment</td>
 <td>BD BBL Middlebrook</td>
 <td>212351</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Oleic Acid</td>
 <td>Sigma</td>
 <td>O1008</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Potassium Phosphate Dibasic</td>
 <td>VWR</td>
 <td>BDH0266</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Potassium Phosphate Monobasic</td>
 <td>VWR</td>
 <td>BDH0268</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Rotor - Microfuge 22R</td>
 <td>Beckman Coulter</td>
 <td>F241.5P</td>
 <td>Sealed and polypropylene</td>
 </tr>
 <tr>
 <td>Rotor - Allegra X-15R</td>
 <td>Beckman Coulter</td>
 <td>SX4750</td>
 <td>With bio-certified covers</td>
 </tr>
 <tr>
 <td>Sodium Chloride</td>
 <td>Fisher Scientific</td>
 <td>S271-3</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Sodium-3-trimethylsilylpropionate-2,2,3,3-D4</td>
 <td>Cambridge Isotope</td>
 <td>DLM-48</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Spectrophotometer</td>
 <td>Beckman Coulter</td>
 <td>DU-530</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Spectrophotometer Cuvettes</td>
 <td>LifeLINE</td>
 <td>LS-2410</td>
 <td>1.5 ml polystyrene, 2 clear sides</td>
 </tr>
 <tr>
 <td>Syringe</td>
 <td>Becton Dickinson</td>
 <td>309585</td>
 <td>Sterile, 3 ml Luer-Lok</td>
 </tr>
 <tr>
 <td>Syringe Filter</td>
 <td>Nalgene</td>
 <td>190-2520</td>
 <td>0.2 &mu;m sterile cellulose acetate</td>
 </tr>
 <tr>
 <td>Tween 80</td>
 <td>Fisher Scientific</td>
 <td>BP338-500</td>
 <td>&nbsp;</td>
 </tr>
 </tbody>
</table>

sample preparation of mycobacterium tuberculosis extracts for nuclear magnetic resonance metabolomic studies

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) drug-resistant strains threatens to derail current disease control efforts. Thus, there is an urgent need to develop drugs and vaccines that are more effective than those currently available. The genome of M. tuberculosis has been known for more than 10 years, yet there are important gaps in our knowledge of gene function and essentiality. Many studies have since used gene expression analysis at both the transcriptomic and proteomic levels to determine the effects of drugs, oxidants, and growth conditions on the global patterns of gene expression. Ultimately, the final response of these changes is reflected in the metabolic composition of the bacterium including a few thousand small molecular weight chemicals. Comparing the metabolic profiles of wild type and mutant strains, either untreated or treated with a particular drug, can effectively allow target identification and may lead to the development of novel inhibitors with anti-tubercular activity. Likewise, the effects of two or more conditions on the metabolome can also be assessed. Nuclear magnetic resonance (NMR) is a powerful technology that is used to identify and quantify metabolic intermediates. In this protocol, procedures for the preparation of M. tuberculosis cell extracts for NMR metabolomic analysis are described. Cell cultures are grown under appropriate conditions and required Biosafety Level 3 containment,1 harvested, and subjected to mechanical lysis while maintaining cold temperatures to maximize preservation of metabolites. Cell lysates are recovered, filtered sterilized, and stored at ultra-low temperatures. Aliquots from these cell extracts are plated on Middlebrook 7H9 agar for colony-forming units to verify absence of viable cells. Upon two months of incubation at 37 &deg;C, if no viable colonies are observed, samples are removed from the containment facility for downstream processing. Extracts are lyophilized, resuspended in deuterated buffer and injected in the NMR instrument, capturing spectroscopic data that is then subjected to statistical analysis. The procedures described can be applied for both one-dimensional (1D) 1H NMR and two-dimensional (2D) 1H-13C NMR analyses. This methodology provides more reliable small molecular weight metabolite identification and more reliable and sensitive quantitative analyses of cell extract metabolic compositions than chromatographic methods. Variations of the procedure described following the cell lysis step can also be adapted for parallel proteomic analysis.

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Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

The metabolomic profile of Mycobacterium tuberculosis is determined after growth in broth cultures. Conditions can be varied to test the effects of nutritional supplements, oxidants, and anti-tuberculosis agents on the metabolic profile of this microorganism. Procedure for extract preparation is applicable for both 1D 1H and 2D 1H-13C NMR analyses.

Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) ...

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15.2K vistas.  University of Nebraska-Lincoln. El perfil de metabolómica Mycobacterium tuberculosis Se determina después de crecimiento en cultivos de caldo. Las condiciones se pueden variar para probar los efectos de los suplementos nutricionales, agentes oxidantes, y agentes contra la tuberculosis en el perfil metabólico de este microorganismo. Procedimiento para la preparación del extracto es aplicable tanto para 1D 1 H y 2D 1 H- 13 C análisis d...