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Proteins, Expression, Isolation and Analysis | Recombinant Glutathione-S-Transferase (>90% purity, GST from Schistosoma japonicum) produced in E.coli was purchased in lyophilized form from GenScript (Piscataway, NJ). Deuterium oxide (D2O − 99.99%), ammonium acetate (99.99%), acetic acid (99.7%), pepsin agarose beads, and reduced l-glutathione (GSH) were purchased form Sigma Aldrich (St. Louis, MO). Dialysis cassettes (2.5 kDa MWCO) were purchased from Fisher Scientific (Ottawa, ON). Metal capillaries (O.D. 355 μm, I.D. 177 μm and O.D. 400 μm, I.D. 254 μm) and PTFE tubing (O.D. 1/16”, I.D. 400 μm and O.D. 1/16”, I.D. 360 μm) were purchased from McMaster-CARR (Aurora, OH). Upchurch PEEK fittings 1/16” and PEEK MicroTEE were purchased from IDEX (Oak Harbor, WA). Poly-methyl-methacrylate (PMMA) blocks (8.9 cm × 3.8 cm × 0.6 cm) for production of the microfluidic device were purchased form Professional Plastics (Orchard Park, NY). Ultrapure water was generated in-house using a Millipore Milli-Q Advantage A10 system (Billerica, MA).The main text of the article should go here with headings as appropriate. | Get A Quote |
Hydrogen Deuterium eXchange (HDX) is rapidly emerging as a key technique for characterizing changes in dynamics that accompany protein complexation and ligand binding. Binding site mapping is an important application of HDX, however, artifacts from allosteric effects often introduce ambiguity into the results. We have previously developed a microfluidic device that incorporates a complete ‘bottom-up’ HDX workflow with rapid mixing for time-resolved (millisecond time-scale) labelling. Here, we evaluate this approach for mapping ligand-binding using the well-characterized interaction between glutathione-S-Transferase (GST) and glutathione (GSH). In a rapid analysis, significant decreases in dynamics w... More