The Protein Man's Blog | A Discussion of Protein Research

Protease and phosphatase inhibitor cocktails are essential to most cell lysis and protein extraction procedures. The inhibitors protect protein samples from degradation and preserve their phosphorylation state.

A reliable LDH cytotoxicity assay detects cell toxicity, cell death, cell viability, and cell proliferation. It is also ideal for the application of cell-free supernatants from cells in culture (adherent or suspension).

Proteomes can be made up of more 15,000-20,000 different protein species that differ greatly in properties such as molecular mass, charge, abundance, hydrophobicity and other characteristics. Extraction of proteome for analysis is therefore a daunting task that requires careful attention to details. Sample preparation for proteome analysis requires solubilization of proteins. The choice of optimal method for solubilization of protein mixture is critical since sample preparation affects the outcome of analysis. Usually the steps involved are homogenization, solubilization and stabilization when proteome sample is prepared from cells or tissues.

Plasmid isolation is crucial to biology and an essential step in various procedures, including cloning, DNA sequencing, transfection, in vitro translation, blotting, and gene therapy. However, these applications require the isolation of high-purity plasmid DNA. Whereas genomic DNA extraction is simple and straightforward, plasmid DNA extraction can be more complicated.