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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Secretagogin, a hexa EF-hand calcium-binding protein: high level bacterial overexpression, one-step purification and properties.
Protein Expression and Purification 2015 May
Secretagogin (SCGN), a hexa EF-hand calcium-binding protein, is highly expressed in the endocrine cells (especially in pancreatic islets) and in restricted neuronal sub-populations, albeit at comparatively low level. Since SCGN is predicted to be a potential neuroendocrine marker in carcinoid tumors of lung and gastrointestinal tract, it is of paramount importance to understand the features of this protein in different environment for assigning its crucial functions in different tissues and under pathophysiological conditions. To score out the limitation of protein for in vitro studies, we report a one-step, high purity and high level bacterial purification of secretagogin by refolding from the inclusion bodies yielding about 40mg protein per litre of bacterial culture. We also report previously undocumented Ca(2+)/Mg(2+) binding and hydrodynamic properties of secretagogin.
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