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A simple and efficient method for the preparation of 5-hydroxy-3-acyltetramic acids.

ABSTRACT: Oxidation of the bisenolates of 3-acyltetramic acid to the corresponding 5-hydroxylated compounds using molecular oxygen is reported. The deprotection of the resulting compounds was also achieved.

SUBMITTER: Trenner J

PROVIDER: S-EPMC4362042 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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A simple and efficient method for the preparation of 5-hydroxy-3-acyltetramic acids.

Trenner Johanna J Prusov Evgeny V EV

Beilstein journal of organic chemistry 20150306

Oxidation of the bisenolates of 3-acyltetramic acid to the corresponding 5-hydroxylated compounds using molecular oxygen is reported. The deprotection of the resulting compounds was also achieved. ...[more]

PMID: 25815086

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Project description:Background and Aims: Liver proteomics with limited sample amounts is technically challenging but valuable for innovative hepatology research. We aimed to establish a simple and high-efficient approach for protein extraction and preparation from the formaldehyde-fixed paraffin-embedded (FFPE) liver samples for microproteomics assessment. Methods: Individual cell collected by laser capture microdissection (LCM) from FFPE liver slices were used as test samples with microscale samples of fresh-frozen liver or cultured liver cells as controls. Protocol for extracting protein was determined through the orthogonal test of 6 conditions of buffer compositions and heating processes. For sample preparation, we adjusted the protocol of single-tube solid-phase sample preparation (SP3) by enhancing protein precipitation and elution and developed a new method named HDMSP. HDMSP was then tested for its capability, reproducibility, and sample-type compatibility in analysis with nanoscale liquid chromatography-tandem mass spectrometry (nano LC-MS/MS). Results: For FFPE protein extraction, adding 4% SDS significantly increased the production by 2.5 times; incubation for 2 hours at 95℃ in alkaline amine buffer improved both the efficiency and quality of protein extraction. For the development of HDMSP, using 2% SDS to elute protein, using 70% acetonitrile but not ethanol, and increasing input of carboxyl magnetic beads to 2 mg/ml improved the rate of protein recovery by 88%, 50%, and 74%, respectively. For either 20 nL FFPE liver or HepG2 cell samples, or 1~2 μg fresh-frozen liver samples, the rate of protein recovery was stable at around 75%. LC-MS/MS demonstrated that the protocol designed for FFPE samples protein extraction allowed for unbiased extraction of insoluble or hydrophobic proteins and with HDMSP, the depth, identification, physicochemical properties, subcellular locations, and reproducibility of FFPE liver microproteome was comparable to those of fresh-frozen sample control. HDMSP also showed high efficiency and reproducibility for subcellular nuclear and cytoplasm-isolated proteins. Conclusion: The new approach including 300mM Tris, 4% SDS incubation for 2h at 95°C, and then preparation with HDMSP is simple, robust, and highly efficient for use in microproteomics of FFPE liver samples. This protocol can provide a solution reference for liver FFPE microproteomics.

Dataset Information

A simple and efficient method for the preparation of 5-hydroxy-3-acyltetramic acids.

Publications

A simple and efficient method for the preparation of 5-hydroxy-3-acyltetramic acids.

Similar Datasets

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