A two-dimensional proteome reference map of Herbaspirillum seropedicae proteins

Area of Science:

• Microbiology
• Proteomics
• Genomics

Background:

• Herbaspirillum seropedicae is an endophytic diazotroph vital for major crops including rice, sugarcane, and wheat.
• Understanding its protein expression is key to optimizing its agricultural applications.

Purpose of the Study:

• To create a comprehensive 2-D reference map for Herbaspirillum seropedicae.
• To support the genome annotation of H. seropedicae.
• To establish a foundation for comparative proteomic analyses.

Main Methods:

• Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF-MS) was employed.
• Protein expression profiles were analyzed to generate a 2-D reference map.

Main Results:

• A total of 205 protein spots were identified, corresponding to 173 distinct proteins.
• An average of 1.18 proteins per gene was calculated.
• Seventeen hypothetical or conserved hypothetical open reading frames (ORFs) were confirmed to encode actual gene products.

Conclusions:

• The generated 2-D protein map provides essential data for the accurate annotation of the H. seropedicae genome.
• This proteomic dataset serves as a valuable resource for future comparative studies on related bacterial species.