Proteomic tools to characterize the protein fraction of Equidae milk

Proteomics
Guy MirandaPatrice Martin

Abstract

The principal components of the protein fraction in pony mare's milk have been successfully identified and partially characterized using proteomic tools. Skimmed pony mare's milk was fractionated by either reversed phase-high-performance liquid chromatography (RP-HPLC) on a C4 column or a bi-dimensional separation technique coupling RP-HPLC in the first dimension and sodium dodecyl sulfate-polyacrylamide electrophoresis (SDS-PAGE) in the second dimension (two-dimensional RP-HPLC/SDS-PAGE). The fractions thus obtained were analyzed by Edman N-terminal microsequencing and mass determination, with or without tryptic digestion, on a matrix-assisted laser desorption/ionization-time of flight spectrometer. Based on the sequence and molecular mass information obtained, identifications were achieved through a protein database search using homology or pattern research algorithms. This methodological approach was shown to be rapid, efficient and reliable in identifying the principal proteins in pony mare's milk. kappa-, alpha(s1)-, alpha(s2)-, and beta-casein, lysozyme C, alpha-lactalbumin and beta-lactoglobulin I and II were thus identified. alpha(s1) and beta-caseins displayed polymorphic patterns, probably due to alternative splicing ...Continue Reading

Citations

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