Abstract
Analysis of the protein aldolase using proteomic methodologies allowed the discrimination of the Cape hakes, Merluccius capensis and Merluccius paradoxus. A classical bottom-up proteomics approach, consisting of two-dimensional gel electrophoresis, tryptic in-gel digestion, and LC-MS/MS analyses, was performed for the characterization and de novo sequencing of the aldolase spots. The sequences discovered presented a high degree of homology with the aldolase A sequence from the teleostei Tetraodon nigroviridis. De novo sequencing of several MS/MS spectra from the aldolase A spots allowed the characterization of two species-specific peptide biomarkers. One of them was unique to Merluccius capensis while the other was present only in Merluccius paradoxus. These peptide biomarkers can be used to discriminate between both species of Cape hakes.
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