What did the Rout laboratory measure after grinding frozen yeast?
The Rout laboratory reported approximately 90% disruption of frozen yeast cells using a RETSCH PM 100 in a specific cooled-jar protocol. The figure describes cell lysis. Recovery of intact protein complexes was a separate downstream question.
Why the Rout laboratory ground frozen yeast
In 2006 the Michael Rout laboratory at Rockefeller University investigated grinding frozen yeast for research on nuclear pore complexes. The team needed disrupted cells for subsequent protein purification. It developed a preparation using the RETSCH PM 100 and published its protocol in March 2007.
How the sample stayed frozen
The laboratory pre-cooled the stainless steel jar, lid and grinding balls separately from the frozen yeast. It selected the jar and ball charge for the volume of frozen material and cooled the assembly between grinding cycles. Liquid nitrogen had to be excluded from the closed grinding jar because trapped liquid can create dangerous pressure as it warms.
The protocol distinguished 50 mL and 125 mL jars and used eight grinding cycles. Jar size, ball charge and cooling between cycles were parts of a single experimental arrangement. A rotation speed in isolation cannot describe the treatment experienced by the cells.
What the researchers measured
The preparation produced approximately 90% cell disruption in the described experiment. The frozen ground cells were stored at −80 °C. The percentage measures cell disruption under the reported conditions. Protein recovery and integrity require their own measurements.
At the Laboratory of Eukaryotic Molecular Biology in Toulouse, Dr. Célia Plisson-Chastang used a 125 mL stainless steel jar and seven to eleven stainless steel balls, each 20 mm in diameter. Chromatographic purification followed grinding, with electron microscopy and image analysis used to study the recovered protein particles.
Which handling conditions matter when transferring the Rout approach?
Cooling, vessel handling and the research endpoint are linked. Reproducing a published operating condition in a different sample or setup does not establish equivalent recovery. Discuss the exact equipment, supported cooling arrangement and biological preparation needs before adopting a process.
| Consideration | Information to provide |
|---|---|
| Sample state | Frozen pellet composition and quantity |
| Handling plan | Cooling and transfer sequence |
| Research endpoint | Material required after lysis |
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