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The sheep milk fat globule membrane proteome

Salvatore S Pisanu, Stefania S Ghisaura, Daniela D Pagnozzi, Grazia G Biosa, Alessandro A Tanca, Tonina T Roggio, Sergio S Uzzau, and Maria Filippa MF Addis

J Proteomics 74(3):9 (2011) PMID 21147282

Milk fat globule membranes (MFGM) are three-layered structures that enclose fat droplets, and are composed by an internal monolayer of endoplasmic reticulum origin, surrounded by a bilayer derived from the apical membrane of the lactating cell. In this work, an optimized protein extraction method was applied to sheep MFGM, and extracts were subjected to SDS-PAGE separation followed by shotgun LC tandem mass spectrometry (GeLC-MS/MS) for identification and characterization. In total, 140 unique sheep MFGM proteins (MFGMPs) were identified. All protein identification data were subjected to Gene Ontology (GO) classification for localization and function. Moreover, the relative abundance of all identified MFGMPs was estimated by means of the normalized spectral abundance factor (NSAF) approach, and GO abundance classes were obtained. The data gathered in this work provide a detailed picture of the proteome expressed in healthy sheep MFGs, and lay the foundations for future studies on sheep lactation physiology and on its alterations in pathological conditions.

Copyright © 2011 Elsevier Ltd. All rights reserved.

DOI: 10.1016/j.jprot.2010.11.011
Version: za2963e q8za0 q8zbe q8zc8 q8zdd q8ze3 q8zf6 q8zga
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