title: LC MS/MS identification of large structural proteins from bull muscle and their degradation products during post mortem storage.
abstract: Large proteins (>100kDa) in bovine M. longissimus dorsi and their degradation products during post mortem ageing were investigated by gel electrophoresis and LC-MS/MS analysis. Seventeen protein bands from SDS-PAGE were analysed and 26 proteins were identified. Intact titin, nebulin and filamin were shown to break down during post mortem ageing of meat. A number of myosin super-family members were revealed on SDS-PAGE. Myosin heavy chain 1 (MYH1), myosin heavy chain 2 (MYH2), and myosin heavy chain 7 (MYH7) were distributed broadly across the bands in the forms of cross-linked/aggregated polymers, and also as fragments. Three myomesin family members: myomesin 1 (185kDa isoform 1), myomesin (M-protein) 2, 165kDa, and myomesin family member 3, were identified in the muscle samples. Several other proteins such as synemin, myosin binding protein C (C-protein), glycogen debranching enzyme and ryanodine receptor 2 were also identified.
authors.affiliation: AgResearch, Ruakura Research Centre, Hamilton, New Zealand. Electronic address: guojie.wu@agresearch.co.nz.
authors.forename: Guojie
authors.initials: G
authors.lastname: Wu
authors.affiliation: AgResearch, Lincoln Research Centre, Christchurch, New Zealand.
authors.forename: Stefan
authors.initials: S
authors.lastname: Clerens
authors.affiliation: AgResearch, Ruakura Research Centre, Hamilton, New Zealand.
authors.forename: Mustafa M
authors.initials: MM
authors.lastname: Farouk
mesh_terms: D000818:Animals; D002417:Cattle; D002853:Chromatography, Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D008460:Meat / Q000032:analysis*; D008970:Molecular Weight; D009124:Muscle Proteins / Q000737:chemistry*; D018482:Muscle, Skeletal / Q000737:chemistry*; D011180:Postmortem Changes; D011487:Protein Conformation; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D009124:Muscle Proteins
keywords: LC–MS/MS; Muscle structural proteins; Myosin super-family; Post mortem storage; Protein identification; SDS–PAGE