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Method development for protein enrichment in gel-free proteomic analysis of whole fish


Nuez Ortin, W and Carter, CG and Nichols, PD and Wilson, RR, Method development for protein enrichment in gel-free proteomic analysis of whole fish, 16th International Symposium on Fish Nutrition and Feeding, May 25-30 2014, Cairns, Australia (2014) [Conference Extract]


Organ-specific proteomics of larval fish is limited by difficulties in dissection. Thus, method development for efficient proteomic analysis of whole fish is required to investigate changes in larvae physiology. Proteome assessment of whole fish is hampered by the presence of high-abundant proteins, which interfere with the detection of low-abundant proteomic components, and consequently hide physiologically significant changes restricted to a certain cell type. Several strategies exist to reduce sample complexity and extend the range of proteins detected. For example, in 2-D gel based proteomics, narrower pH–range IPG strips and larger gels can increase the detection of lower-abundance proteins. Our aim is to develop a robust protein extraction method from whole fish larvae to study changes in protein expression using label-free shotgun proteomics. Different protein extraction methods were compared for their ability to enhance protein enrichment in samples of Atlantic salmon larvae (~200 mg). Manual sample disruption was compared with mechanical homogenization, and direct protein extraction (Urea/Thiourea/Tris) was compared with solubility-based protein fractionation (NaCl/Tris + Urea/Thiourea/Tris). SDS-PAGE analysis of sequential fractionation revealed distinct protein profiles. Preliminary studies on whole Atlantic salmon larvae using manual disruption and direct protein extraction identified 432 proteins. Ongoing shotgun proteomic analysis will determine the effectiveness of this approach to increase proteome coverage.

Item Details

Item Type:Conference Extract
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Nuez Ortin, W (Mr Waldo Nuez Ortin)
UTAS Author:Carter, CG (Professor Chris Carter)
UTAS Author:Wilson, RR (Dr Richard Wilson)
ID Code:93575
Year Published:2014
Deposited By:Central Science Laboratory
Deposited On:2014-08-08
Last Modified:2014-09-09

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