Preparation of soluble isotopically labeled NKp30, a human natural cytotoxicity receptor, for structural studies using NMR

0389064 - MBÚ 2013 RIV US eng J - Journal Article
Grave, L. - Tůmová, L. - Mrázek, Hynek - Kavan, Daniel - Chmelík, Josef - Vaněk, Ondřej - Novák, Petr - Bezouška, K.
Preparation of soluble isotopically labeled NKp30, a human natural cytotoxicity receptor, for structural studies using NMR.
Protein Expression and Purification. Roč. 86, č. 2 (2012), s. 142-150. ISSN 1046-5928. E-ISSN 1096-0279
R&D Projects: GA ČR GA303/09/0477; GA ČR GD305/09/H008
Institutional support: RVO:61388971
Keywords : NKp30 * NK cell receptor * Uniformly labeled proteins
Subject RIV: CE - Biochemistry
Impact factor: 1.429, year: 2012

Using a codon-optimized gene fragment, we report remarkable yields for extracellular domain of human NK cell receptor (NKp30ex) when produced on M9 minimal medium, even with low (2 g/L) glucose concentration. The yields were identical using media containing (NH4Cl)-N-15 or (NH4Cl)-N-15 in combination with all-C-13-D-glucose allowing to produce homogenous soluble monomeric NKp30 in several formats needed for advanced NMR studies. Our optimized protocol now allows to produce routinely 10 mg batches of these NKp30ex proteins per 1 L of M9 production medium in four working days. The purity and identity of the produced proteins were checked by SDS-PAGE, MALDI MS peptide mapping, and high resolution ion cyclotron resonance MS. Analytical ultracentrifugation confirmed the monomeric status of the produced proteins. Long-term stability of the produced protein proved to be very good allowing its use for NMR studies using elevated temperatures. These studies should reveal further details of the interaction of NKp30 with several of its ligands including target cell surface proteins and heparin-derived oligosaccharides. (C) 2012 Elsevier Inc. All rights reserved
Permanent Link: http://hdl.handle.net/11104/0217995