Medicago PhosphoProtein Database: a repository for Medicago truncatula phosphoprotein data

Area of Science:

• Plant Biology
• Biochemistry
• Bioinformatics

Background:

• Legume crops are vital for agriculture due to their ability to fix atmospheric nitrogen through symbiosis with rhizobia.
• This symbiosis is initiated by protein phosphorylation-mediated signaling in response to rhizobial Nod factors.
• Medicago truncatula serves as a model organism for studying legume biology, necessitating detailed phosphoproteome analysis.

Purpose of the Study:

• To introduce the Medicago PhosphoProtein Database (MPPD), a dedicated repository for Medicago phosphoprotein, phosphopeptide, and phosphosite data.
• To provide a centralized resource for researchers studying protein phosphorylation in Medicago.
• To facilitate the study of signaling pathways involved in legume-microbe interactions.

Main Methods:

• Development of a web-based repository (MPPD) to house phosphoproteomic data.
• Data curation including identification of phosphoproteins, phosphopeptides, and phosphorylation sites.
• Implementation of search and BLAST functionalities for user-friendly data retrieval.

Main Results:

• The MPPD currently contains data on 829 proteins, including 3,457 unique phosphopeptides and 3,404 non-redundant phosphorylation sites.
• The database offers browsing and searching capabilities for identified proteins.
• Users can perform BLAST searches using peptide sequences and phosphorylation motifs.

Conclusions:

• The MPPD provides an essential, downloadable resource for Medicago phosphorylation data.
• The database will be continuously updated, aiming to be a comprehensive compendium of Medicago phosphorylation.
• This resource will advance the understanding of phosphorylation in legume biology and nitrogen fixation.