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Electrophoretic Extraction and Proteomic Characterization of Proteins Buried in Marine Sediments

Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD 20688, USA
Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, USA
School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA
Department of Genomic Sciences, University of Washington, Seattle, WA 98195, USA
Author to whom correspondence should be addressed.
Chromatography 2014, 1(4), 176-193;
Received: 1 July 2014 / Revised: 11 September 2014 / Accepted: 18 September 2014 / Published: 13 October 2014
Proteins are the largest defined molecular component of marine organic nitrogen, and hydrolysable amino acids, the building blocks of proteins, are important components of particulate nitrogen in marine sediments. In oceanic systems, the largest contributors are phytoplankton proteins, which have been tracked from newly produced bloom material through the water column to surface sediments in the Bering Sea, but it is not known if proteins buried deeper in sediment systems can be identified with confidence. Electrophoretic gel protein extraction methods followed by proteomic mass spectrometry and database searching were used as the methodology to identify buried phytoplankton proteins in sediments from the 8–10 cm section of a Bering Sea sediment core. More peptides and proteins were identified using an SDS-PAGE tube gel than a standard 1D flat gel or digesting the sediment directly with trypsin. The majority of proteins identified correlated to the marine diatom, Thalassiosira pseudonana, rather than bacterial protein sequences, indicating an algal source not only dominates the input, but also the preserved protein fraction. Abundant RuBisCO and fucoxanthin chlorophyll a/c binding proteins were identified, supporting algal sources of these proteins and reinforcing the proposed mechanisms that might protect proteins for long time periods. Some preserved peptides were identified in unexpected gel molecular weight ranges, indicating that some structural changes or charge alteration influenced the mobility of these products during electrophoresis isolation. Identifying buried photosystem proteins suggests that algal particulate matter is a significant fraction of the preserved organic carbon and nitrogen pools in marine sediments. View Full-Text
Keywords: proteomics; extraction; marine; sediments; protein; bioinformatics proteomics; extraction; marine; sediments; protein; bioinformatics
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Moore, E.K.; Harvey, H.R.; Faux, J.F.; Goodlett, D.R.; Nunn, B.L. Electrophoretic Extraction and Proteomic Characterization of Proteins Buried in Marine Sediments. Chromatography 2014, 1, 176-193.

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