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Expression, purification, and evaluation for anticancer activity of ribosomal protein L31 gene (RPL31) from the giant panda (Ailuropoda melanoleuca)

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Abstract

Ribosomal protein L31 gene is a component of the 60S large ribosomal subunit encoded by RPL31 gene, while ribosomal protein L31 (RPL31) is an important constituent of peptidyltransferase center. In our research, the cDNA and the genomic sequence of RPL31 were cloned successfully from the giant panda (Ailuropoda melanoleuca) using RT-PCR technology respectively, following sequencing and analyzing preliminarily. We constructed a recombinant expression vector contained RPL31 cDNA and over-expressed it in Escherichia coli using pET28a plasmids. The expression product was purified to obtain recombinant protein of RPL31 from the giant panda. Recombinant protein of RPL31 obtained from the experiment acted on human laryngeal carcinoma Hep-2 and human hepatoma HepG-2 cells for study of its anti-cancer activity by MTT [3-(4, 5-dimehyl-2-thiazolyl)-2, 5-diphenyl-2H-tetrazolium bromide] method. Then observe these cells growth depressive effect. The result indicated that the cDNA fragment of the RPL31 cloned from the giant panda is 419 bp in size, containing an open reading frame of 378 bp, and deduced protein was composed of 125 amino acids with an estimated molecular weight of 14.46-kDa and PI of 11.21. The length of the genomic sequence is 8,091 bp, which was found to possess four exons and three introns. The RPL31 gene can be readily expressed in E.coli, expecting 18-kDa polypeptide that formed inclusion bodies. Recombinant protein RPL31 from the giant panda consists of 157 amino acids with an estimated molecular weight of 17.86 kDa and PI of 10.77. The outcomes showed that the cell growth inhibition rate in a time- and dose-dependent on recombinant protein RPL31. And also indicated that the effect at low concentrations was better than high concentrations on Hep-2 cells, and the concentration of 0.33 μg/mL had the best rate of growth inhibition, 44 %. Consequently, our study aimed at revealing the recombinant protein RPL31 anti-cancer function from the giant panda, providing scientific basis and resources for the research and development of cancer protein drugs anti-cancer mechanism research. Further studies of the mechanism and the signal transduction pathways are in progress.

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Acknowledgments

The Key Chinese National Natural Science Foundation (30570275), Key Discipline Construction Project in Sichuan Province (SZD0420), Sichuan key discipline zoology construction funds subsidization project (404001), Application Foundation Project in Sichuan Province (2009JY0061), Youth Fund Project of Educational Committee of Sichuan Province (09ZB088), Foundation Project of Educational Committee of Sichuan Province (10ZC120). Application Foundation Project in Sichuan Province (2011JY0135).

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The authors report no conflicts of interest in this work.

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  1. College of Life Science, China West Normal University, Nanchong, 637009, China

    Xiu-Lan Su, Yi-Ling Hou, Xiang-Hui Yan, Xiang Ding, Wan-Ru Hou, Bing Sun & Si-Nan Zhang

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  1. Xiu-Lan Su
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  2. Yi-Ling Hou
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Correspondence to Wan-Ru Hou.

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Su, XL., Hou, YL., Yan, XH. et al. Expression, purification, and evaluation for anticancer activity of ribosomal protein L31 gene (RPL31) from the giant panda (Ailuropoda melanoleuca). Mol Biol Rep 39, 8945–8954 (2012). https://doi.org/10.1007/s11033-012-1763-0

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