Database Creator for Mass Analysis of Peptides and Proteins, DC-MAPP: A Standalone Tool for Simplifying Manual Analysis of Mass Spectral Data to Identify Peptide/Protein Sequences.

Proteomic studies typically involve the use of different types of software for annotating experimental tandem mass spectrometric data (MS/MS) and thereby simplifying the process of peptide and protein identification. For such annotations, these softwares calculate the / values of the peptide/protein precursor and fragment ions, for which a database of protein sequences must be provided as an input file. The calculated / values are stored as another database, which the user usually cannot view.

Mimicking LysC Proteolysis by 'Arginine Modification-cum-Trypsin Digestion': Comparison of Bottom-up & Middle-down Proteomic Approaches by ESI Q-TOF MS.

Background: Middle-down (MD) proteomics is an emerging approach for reliable identification of post-translational modifications and isoforms, as this approach focuses on proteolytic peptides containing > 25-30 amino acid residues (a.a.r.

Middle-down approach: a choice to sequence and characterize proteins/proteomes by mass spectrometry.

Owing to rapid growth in the elucidation of genome sequences of various organisms, deducing proteome sequences has become imperative, in order to have an improved understanding of biological processes. Since the traditional Edman method was unsuitable for high-throughput sequencing and also for N-terminus modified proteins, mass spectrometry (MS) based methods, mainly based on soft ionization modes: electrospray ionization and matrix-assisted laser desorption/ionization, began to gain significance. MS based methods were adaptable for high-throughput studies and applicable for sequencing N-terminus blocked proteins/peptides too.