Soluble purified recombinant C2ORF40 protein inhibits esophageal cancer cell proliferation by inducing cell cycle G1 phase block.

Chromosome 2 open reading frame 40 (C2ORF40) plays an important role in various processes, including cell differentiation, senescence, apoptosis, inflammation and neuroendocrine hormone regulation. Additionally, C2ORF40 is a candidate tumor suppressor gene in various tumors, and is closely linked to prognosis. bioinformatics analysis has indicated that the pro-C2ORF40 is a protein secreted by the signal peptide. C2ORF40 secreted Feline Recombinant Proteins protein (sC2ORF40) in cancer cell media.

 However, so far, the exact biological function of sC2ORF40 in carcinogenesis has not been thoroughly researched. In this study, the signal peptide sequence of DNA complementary C2ORF40 initially cut to produce a protein secreted recombinant human C2ORF40 (rhC2ORF40). The rhC2ORF40 soluble expressed, purified and checked for tumor suppressor function for the first time. 

The results showed that the purified protein with a purity concentrated soluble rhC2ORF40 >> 95%. Furthermore, rhC2ORF40 inhibited the proliferation of esophageal cancer cells in vitro (P <0.05) and lead block G1 phase of the cell cycle, as determined by flow cytometric analysis (P <0.05). Overall, rhC2ORF40 soluble protein with high purity and biological activity was obtained, which is pressed esophageal cancer cells proliferation by inducing cell cycle G1 phase block in vitro. Therefore, rhC2ORF40 soluble protein could be a potential biological therapeutic drug for cancer of the esophagus

structural characterization by transmission electron microscopy and immunoreactivity recombinant Hendra virus nucleocapsid protein was expressed and purified from Escherichia coli.

Hendra virus (family Paramyxoviridae) is a negative sense single-stranded RNA virus (NSRV) which has been found to cause disease in humans, horses, and other experimental animals, such as pigs and cats. Pteropid bats commonly known as flying foxes have been identified as a natural reservoir host. 

Hendra virus nucleocapsid protein (HEV N) is the most abundant viral protein produced by the host cell, and highly immunogenic with naturally infected humans and horses produce specific antibodies against this protein. The purpose of this study was to express and purify soluble, active functional recombinant HEV N, suitable for use as immunodiagnostic reagents for the detection of antibodies to HEV. We expressed the full-length HEV N, (HEV NFL), and a C-terminal truncated form, (HEV NCORE), heterologous expression system using bacteria.

 Both construction HEV N Hisx6 engineered Guinea Pig Recombinant Proteins with N-terminal tag, and purified using a combination of moving metal affinity chromatography (IMAC) and size exclusion chromatography (SEC). Purified recombinant HEV N protein self-assembled into soluble oligomers higher as determined by SEC and a negative-stain transmission electron microscopy