title: [Preparation of recombinant HIV-TATm-survivin (T34A) protein and its pro-apoptosis activity to cancer cells in vitro].
abstract: As a novel member of the IAP (Inhibitor of apoptosis protein) family, survivin was observed to be expressed in most human cancerous cells. Fusion protein TATm-survivin (T34A) has drawn considerable attention because it is a potential anti-tumor protein that can be transduced into cancer cell with the help of HIV-TAT domain. In this study, the cDNA encoding survivin was cloned by RT-PCR from human breast cancer cell lines B-Cap-37. An expression vector of pRSET-B-HIV-tatm-survivin (T34A) was constructed by PCR after survivin (T34A) was mutated by site-directed mutagenesis. Subsequently, the resultant plasmid was transformed into E. coli BL21 (DE3). Recombinant HIV-TATm-Survivin (T34A) protein was expressed efficiently with 0.5mM IPTG as inducer, reaching a yield of 650mg/liter (as inclusion body) in fermentation culture. The inclusion bodies were solubilized, refolded and purified to a purity of 96% by ion exchange chromatograghy and size-exclusion chromatography. Remarkable effects of the purified recombinant HIV-TATm-Survivin (T34A) on the morphology of cell line SW1990 and B-Cap-37 were observed after being administrated for 4h. MTT assay showed recombinant HIV-TATm-survivin (T34A) protein could inhibit significantly cell proliferation of SW1990 and B-Cap-37 and SSMC-7721 in vitro. Apoptosis rate and cell circle of SW1990 and B-Cap-37 that had been treated with target protein (final concentration 30 microg/mL) were detected with flow cytometry. Results revealed that more than 65% cancer cells were arrested at G1 phase. The study suggested that TATm-survivin (T34A) protein was a hopeful protein drug in the treatment of cancers by facilitating apoptosis of cancer cells. Key words recombinant HIV-TATm-Survivin (T34A), expression and purification, pro-apoptosis bioactivity, SW1990 and B-Cap-37 cancer cell lines
authors.affiliation: State Key Laboratory of Bioreactor Engineering, Institute of Biochemistry, East China University of Science & Technology, Shanghai 200237, China.
authors.forename: Wen-Yun
authors.initials: WY
authors.lastname: Zheng
authors.forename: Xing-Yuan
authors.initials: XY
authors.lastname: Ma
authors.forename: Dong-Zhi
authors.initials: DZ
authors.lastname: Wei
authors.forename: Jin-Zhi
authors.initials: JZ
authors.lastname: Wang
authors.forename: Qing-Hai
authors.initials: QH
authors.lastname: Liu
authors.forename: Yu-Shu
authors.initials: YS
authors.lastname: Ma
authors.forename: Sheng-Li
authors.initials: SL
authors.lastname: Yang
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D051017:Apoptosis Regulatory Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology; D001483:Base Sequence; D045744:Cell Line, Tumor; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000494:pharmacology*; D000077022:Survivin; D054322:tat Gene Products, Human Immunodeficiency Virus / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology
chemical_list: D051017:Apoptosis Regulatory Proteins; C512124:HIV-TAT-survivin (T34A) protein; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D000077022:Survivin; D054322:tat Gene Products, Human Immunodeficiency Virus