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Secretory overexpression and isotopic labeling of the chimeric relaxin family peptide R3/I5 in Pichia pastoris

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Abstract

Relaxin family peptides are a group of peptide hormones with divergent biological functions. Mature relaxin family peptides are typically composed of two polypeptide chains with three disulfide linkages, rendering their preparation a challenging task. In the present study, we established an efficient approach for preparation of the chimeric relaxin family peptide R3/I5 through secretory overexpression in Pichia pastoris and in vitro enzymatic maturation. A designed single-chain R3/I5 precursor containing the B-chain of human relaxin-3 and the A-chain of human INSL5 was overexpressed in PichiaPink strain 1 by high-density fermentation in a two-liter fermenter, and approximately 200 mg of purified precursor was obtained from one liter of the fermentation supernatant. We also developed an economical approach for preparation of the uniformly 15N-labeled R3/I5 precursor by culturing in shaking flasks, and approximately 15 mg of purified 15N-labeled precursor was obtained from one liter of the culture supernatant. After purification by cation ion-exchange chromatography and reverse-phase high performance liquid chromatography, the R3/I5 precursor was converted to the mature two-chain form by sequential treatment with endoproteinase Lys-C and carboxypeptidase B. The mature R3/I5 peptide had an α-helix-dominated conformation and retained full receptor-binding and receptor activation activities. Thus, Pichia overexpression was an efficient approach for sample preparation and isotopic labeling of the chimeric R3/I5 peptide. This approach could also be extended to the preparation of other relaxin family peptides in future studies.

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Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (31270824, 30970609) and the Fundamental Research Funds from Tongji University.

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The authors declare that they have no conflict of interest.

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Correspondence to Zhan-Yun Guo.

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Handling Editor: M. S. Palma.

Y.-Q. Guo and Q.-P. Wu contributed equally to this work.

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Guo, YQ., Wu, QP., Shao, XX. et al. Secretory overexpression and isotopic labeling of the chimeric relaxin family peptide R3/I5 in Pichia pastoris . Amino Acids 47, 1117–1125 (2015). https://doi.org/10.1007/s00726-015-1939-8

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  • DOI: https://doi.org/10.1007/s00726-015-1939-8

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