Wang H, Zhang X, Kong N, Wei A, Zhang Y, Ma J, Zhou Y, Yan W. Expression, purification and characterization of a recombinant Tat47-57-Oct4 fusion protein in Pichia pastoris.
Mol Med Rep 2013;
9:471-5. [PMID:
24336974 DOI:
10.3892/mmr.2013.1857]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 12/05/2013] [Indexed: 11/06/2022] Open
Abstract
The transcription factor, Oct-4, is involved in the self-renewal of undifferentiated embryonic stem cells, and is also significant in the reprogramming process and in the development of tumors. In the present study, the fusion protein, Tat47‑57-Oct4, was secreted by the signal peptide of human serum albumin in Pichia pastoris under the control of alcohol oxidase promoter 1. The yield of recombinant Tat47‑57-Oct4 fusion protein was ~210 mg/l. Following pilot‑scale fermentation, Tat47‑57-Oct4 was purified by ammonium sulfate precipitation, Vivaflow 200 ultrafiltration and SP Sepharose fast flow chromatography in order to obtain 95.6% purity. Immunofluorescence analysis validated the ability of Tat47‑57-Oct4 to cross the cell membrane. The results demonstrated that the experimental procedure developed in the present study could produce large quantities of active Tat47‑57-Oct4 fusion protein from P. pastoris.
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