The Zea mays PeptideAtlas: A New Maize Community Resource

Area of Science:

• Proteomics
• Bioinformatics
• Genomics

Background:

• The maize proteome presents complex challenges for comprehensive analysis.
• Existing maize proteomic datasets are fragmented and lack uniform processing.
• Understanding maize protein diversity is crucial for crop improvement.

Purpose of the Study:

• To establish a centralized and uniformly processed resource for maize proteomic data.
• To enhance the annotation and understanding of the maize genome.
• To provide a platform for exploring post-translational modifications in maize.

Main Methods:

• Reanalysis of publicly available maize tandem mass spectrometry (MS/MS) data from ProteomeXchange.
• Uniform processing and metadata annotation pipeline applied to raw MS/MS spectra.
• Comprehensive protein database searching against multiple maize genome annotations (B73 and W22).

Main Results:

• Identification of 120 million unique peptides from 445 million MS/MS spectra.
• Matched peptides to 66.2% of proteins in the B73 nuclear genome annotation.
• Detected conserved plastid- and mitochondrial-encoded proteins, and various post-translational modifications.

Conclusions:

• The Maize PeptideAtlas provides a valuable, integrated resource for maize research.
• The study significantly improves maize genome annotation and protein identification.
• The resource facilitates detailed investigation of maize proteome and its modifications.