Supplemental Protocol: Bacterial Lysis with PIXUL Multi-Sample Sonicator
How protein expression labs lyse 96 E. coli cultures in 3 minutes for parallel SDS-PAGE screening of recombinant MBP-fusion constructs.
A complete end-to-end workflow for screening recombinant protein expression in BL21(DE3) E. coli using PIXUL for rapid, simultaneous bacterial lysis in 96-well format. The protocol covers overnight construct growth in LB/Ampicillin, IPTG induction (1 mM, overnight at 25°C for soluble folding), cell harvest into a Bacterial Lysate Buffer with a triple protease inhibitor cocktail, 20 minutes of lysozyme + Benzonase pre-treatment on ice, 3 minutes of PIXUL sonication at 10°C, and SDS-PAGE readout of supernatant and pellet fractions on a 4-12% gradient gel with Instant Blue Coomassie staining. Built for protein biochemists, structural biology core facilities, and synthetic biology groups who need to evaluate 9, 24, or 96 constructs in a single run instead of working through them one at a time with a probe sonicator.
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- 3 minutes of PIXUL sonication at 10°C for complete BL21(DE3) lysis across all wells simultaneously — the shortest validated PIXUL application time, reflecting the relative fragility of the E. coli cell envelope versus yeast cell walls or mammalian tissue.
- 96 constructs in parallel in PIXUL 96-well Round Bottom Plates with Sealer (Cat. No. 53139, required) versus 15-30 minutes per sample with a probe sonicator — a 480x to 960x throughput improvement for full-plate screening.
- Worked SDS-PAGE example with 9 MBP-fusion constructs (METTL14, METTL16, NTAP, NSUN2, NSUN3, NSUN6, TRDMT1, NSUN4, NSUN5) showing supernatant + pellet fractions per construct, 75 µL per well from a 750 µL culture (10x concentrated), 4-12% gradient gel run at 200 V for 40 minutes with Instant Blue Coomassie staining.
- Full Bacterial Lysate Buffer composition — 50 mM Tris-HCl pH 8.0, 100 mM NaCl, 1 mM DTT, plus a triple protease inhibitor cocktail (0.5 mM PMSF + Pepstatin + Leupeptin) and enzymatic pre-treatment (Lysozyme 0.1 µg/mL, Benzonase 3 U/mL) for synergistic lysis without protein degradation or DNA-induced viscosity.
