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Characterisation of Oxidized Recombinant Human Galectin-1

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Oxidized human galectin-1 plays a role in the immune response to injured axons. Over-expression of galectin-1 by cancer, in combination with cancer associated oxidative stress suggests oxidized human galectin-1 may also play a role(s) in tumourigenesis. Here we generate milligram quantities of oxidized human galectin-1 and undertake biophysical characterization. The protein adopts a number of different states. Two separable oxidized forms are identified that exist as largely mono-disperse solutions at higher milligram/ml concentrations. The presence of disulphide bonds is confirmed for these two protein forms, as is their change in overall shape and loss of lectin activity. Our studies lead to production of a particular mono-disperse oxidized human galectin-1 species that is anticipated most optimal for investigations requiring milligram/ml concentrations such as X-ray crystallography.

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Keywords: Galectin-1; galectin-1 oxidation; lectin activity; protein redox state

Document Type: Research Article

Publication date: October 1, 2009

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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