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ZASP: A Highly Compatible and Sensitive ZnCl2 Precipitation-Assisted Sample Preparation Method for Proteomic
Xianfeng Shao1, Yuanxuan Huang1, Rong Xu2
1State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China; Beijing Proteome Research Center, Beijing, China; International Academy of Phronesis Medicine, Guangzhou, Guangdong, China; The π-Hub Infrastructure, Guangzhou, Guangdong, China.
A new method called Zinc Chloride precipitation-assisted sample preparation (ZASP) efficiently removes detergents and impurities for proteomic analysis. This universal approach enhances sensitivity and reproducibility in mass spectrometry workflows.
Area of Science:
- Proteomics
- Analytical Chemistry
- Biochemistry
Background:
- High sensitivity in proteomic analysis requires unbiased sample preparation with minimal protein loss.
- Current methods often struggle with removing incompatible detergents and impurities, impacting downstream analysis.
- A universal, robust, and cost-effective sample preparation technique is needed for liquid chromatography-mass spectrometry (LC-MS).
Purpose of the Study:
- To develop and present a novel Zinc Chloride precipitation-assisted sample preparation (ZASP) method.
- To demonstrate ZASP's efficiency in removing detergents and impurities for proteomic analysis.
- To validate ZASP's performance in terms of sensitivity, reproducibility, and cost-effectiveness.
Main Methods:
- Developed ZASP, a 10-minute method using Zinc Chloride (ZnCl2) and methanol for protein precipitation at room temperature.
- Applied ZASP to deplete SDS, Triton X-100, and urea from protein solutions prior to trypsin digestion.
- Evaluated ZASP's protein recovery across a wide range of protein inputs (1 μg to 1000 μg).
Main Results:
- ZASP effectively removed high concentrations of common detergents and urea incompatible with trypsin digestion and LC-MS.
- Protein recovery was unbiased and independent of the initial protein amount.
- Demonstrated high sensitivity and reproducibility of ZASP across various sample amounts.
- ZASP outperformed SDC-based digestion, acetone precipitation, FASP, and SP3 in efficiency.
Conclusions:
- ZASP is a practical, robust, and cost-effective universal sample preparation method for proteomic analysis.
- The method significantly enhances the sensitivity and reproducibility of LC-MS-based protein profiling.
- ZASP offers a valuable alternative for preparing diverse biological samples for mass spectrometry.
