Title : Reproducibility of the Proteinase K Digest
Abstract :
Previous studies on single glycoproteins could show the successful application of Proteinase K in the context of N- and O-glycoproteomics (32, 49–52)
However, its application on complex samples, like human blood plasma, has not been described so far
Here, we have employed Proteinase K to generate (glyco) peptides from the entire (glyco)proteome of a pooled human blood plasma sample that was derived from 20 healthy donors
To assess the reproducibility of such a digest, five independent Proteinase K treated blood plasma samples (technical replicates) were measured with nanoRP-LC- ESI-IT-MS/MS in preliminary experiments
A comparison of the resulting base peak chromatograms revealed a high reproducibility of these digests, as shown in supplemental Fig