Abstract:
:Nanoluciferase (NanoLuc) is a newly developed small luciferase reporter with the brightest bioluminescence reported to date. In the present work, we developed NanoLuc as a novel quantitative protein fusion tag for efficient overexpression in Escherichia coli and ultrasensitive bioluminescent assays using human leukemia inhibitory factor (LIF) as a model protein. LIF is an interleukin 6 family cytokine that elicits pleiotropic effects on a diverse range of cells by activating a heterodimeric LIFR/gp130 receptor. Recombinant preparation of the biologically active LIF protein is quite difficult due to its hydrophobic nature and three disulfide bonds. Using the novel NanoLuc-fusion approach, soluble 6×His-NanoLuc-LIF fusion protein was efficiently overexpressed in E. coli and enzymatically converted to monomeric mature LIF. Both the mature LIF and the NanoLuc-fused LIF had high biological activities in a leukemia M1 cell proliferation inhibition assay and in a STAT3 signaling activation assay. The NanoLuc-fused LIF retained high binding affinities with the overexpressed LIFR (Kd = 1.4 ± 0.4 nM, n = 3), the overexpressed LIFR/gp130 (Kd = 115 ± 8 pM, n = 3), and the endogenously expressed LIFR/gp130 (Kd = 33.1 ± 3.2 pM, n = 3), with a detection limit of less than 10 receptors per cell. Thus, the novel NanoLuc-fusion strategy not only provided an efficient approach for preparation of recombinant LIF protein but also provided a novel ultrasensitive bioluminescent tracer for ligand-receptor interaction studies. The novel NanoLuc-fusion approach could be extended to other proteins for both efficient sample preparation and various bioluminescent quantitative assays in future studies.
journal_name
Biochimiejournal_title
Biochimieauthors
He SX,Song G,Shi JP,Guo YQ,Guo ZYdoi
10.1016/j.biochi.2014.08.012subject
Has Abstractpub_date
2014-11-01 00:00:00pages
140-8eissn
0300-9084issn
1638-6183pii
S0300-9084(14)00243-0journal_volume
106pub_type
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