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Expression and purification of soluble and stable ectodomain of natural killer cell receptor LLT1 through high-density transfection of suspension adapted HEK293S GnTI(-) cells
J. Bláha, P. Pachl, P. Novák, O. Vaněk,
Language English Country United States
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Killer Cells, Natural metabolism MeSH
- Disulfides metabolism MeSH
- DNA metabolism MeSH
- Glycosylation MeSH
- HEK293 Cells MeSH
- Crystallization MeSH
- Lectins, C-Type chemistry isolation & purification metabolism MeSH
- Humans MeSH
- Molecular Sequence Data MeSH
- Protein Multimerization MeSH
- N-Acetylglucosaminyltransferases metabolism MeSH
- Polyethyleneimine chemistry MeSH
- Polysaccharides metabolism MeSH
- Solubility MeSH
- Solutions MeSH
- Protein Folding MeSH
- Amino Acid Sequence MeSH
- Protein Stability MeSH
- Protein Structure, Tertiary MeSH
- Transfection methods MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Lectin-like transcript 1 (LLT1, gene clec2d) was identified to be a ligand for the single human NKR-P1 receptor present on NK and NK-T lymphocytes. Naturally, LLT1 is expressed on the surface of NK cells, stimulating IFN-γ production, and is up-regulated upon activation of other immune cells, e.g. TLR-stimulated dendritic cells and B cells or T cell receptor-activated T cells. While in normal tissues LLT1:NKR-P1 interaction (representing an alternative "missing-self" recognition system) play an immunomodulatory role in regulation of crosstalk between NK and antigen presenting cells, LLT1 is upregulated in glioblastoma cells, one of the most lethal tumors, where it acts as a mediator of immune escape of glioma cells. Here we report transient expression and characterization of soluble His176Cys mutant of LLT1 ectodomain in an eukaryotic expression system of human suspension-adapted HEK293S GnTI(-) cell line with uniform N-glycans. The His176Cys mutation is critical for C-type lectin-like domain stability, leading to the reconstruction of third canonical disulfide bridge in LLT1, as shown by mass spectrometry. Purified soluble LLT1 is homogeneous, deglycosylatable and forms a non-covalent homodimer whose dimerization is not dependent on presence of its N-glycans. As a part of production of soluble LLT1, we have adapted HEK293S GnTI(-) cell line to growth in suspension in media facilitating transient transfection and optimized novel high cell density transfection protocol, greatly enhancing protein yields. This transfection protocol is generally applicable for protein production within this cell line, especially for protein crystallography.
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- $a Lectin-like transcript 1 (LLT1, gene clec2d) was identified to be a ligand for the single human NKR-P1 receptor present on NK and NK-T lymphocytes. Naturally, LLT1 is expressed on the surface of NK cells, stimulating IFN-γ production, and is up-regulated upon activation of other immune cells, e.g. TLR-stimulated dendritic cells and B cells or T cell receptor-activated T cells. While in normal tissues LLT1:NKR-P1 interaction (representing an alternative "missing-self" recognition system) play an immunomodulatory role in regulation of crosstalk between NK and antigen presenting cells, LLT1 is upregulated in glioblastoma cells, one of the most lethal tumors, where it acts as a mediator of immune escape of glioma cells. Here we report transient expression and characterization of soluble His176Cys mutant of LLT1 ectodomain in an eukaryotic expression system of human suspension-adapted HEK293S GnTI(-) cell line with uniform N-glycans. The His176Cys mutation is critical for C-type lectin-like domain stability, leading to the reconstruction of third canonical disulfide bridge in LLT1, as shown by mass spectrometry. Purified soluble LLT1 is homogeneous, deglycosylatable and forms a non-covalent homodimer whose dimerization is not dependent on presence of its N-glycans. As a part of production of soluble LLT1, we have adapted HEK293S GnTI(-) cell line to growth in suspension in media facilitating transient transfection and optimized novel high cell density transfection protocol, greatly enhancing protein yields. This transfection protocol is generally applicable for protein production within this cell line, especially for protein crystallography.
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- $a Novák, Petr $u Department of Biochemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague 12840, Czech Republic; Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, Prague 14220, Czech Republic.
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- $a Vaněk, Ondřej $u Department of Biochemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague 12840, Czech Republic. Electronic address: ondrej.vanek@natur.cuni.cz.
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