Nanowell-mediated two-dimensional liquid chromatography enables deep proteome profiling of <1000 mammalian cells.

ABSTRACT: Multidimensional peptide separations can greatly increase the depth of coverage in proteome profiling. However, a major challenge for multidimensional separations is the requirement of large biological samples, often containing milligram amounts of protein. We have developed nanowell-mediated two-dimensional (2D) reversed-phase nanoflow liquid chromatography (LC) separations for in-depth proteome profiling of low-nanogram samples. Peptides are first separated using high-pH LC and the effluent is concatenated into 4 or 12 nanowells. The contents of each nanowell are reconstituted in LC buffer and collected for subsequent separation and analysis by low-pH nanoLC-MS/MS. The nanowell platform minimizes peptide losses to surfaces in offline 2D LC fractionation, enabling >5800 proteins to be con

SUBMITTER: Dou M 

PROVIDER: S-EPMC6124911 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature