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Expression and purification of intracrine human FGF 11 and study of its FGFR-dependent biological activity

  • Microbial Physiology and Biochemistry
  • Published:
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Abstract

Fibroblast growth factor 11 (FGF11) is one of intracrine FGFs (iFGFs), which function within cells. Unlike canonical FGFs, FGF11 remains intracellularly and plays biological roles in FGF receptor (FGFR)-independent manner. Here, we established an expression system of recombinant FGF11 proteins in E. coli and investigated whether the extracellular administration of FGF11 can activate cellular signaling. Human FGF11 has two isoforms, FGF11a and FGF11b, depending on the presence of nuclear localization sequences (NLSs) in the N-terminus. Because these two isoforms are unstable, we prepared an FGF11a-Mut by substituting three cysteine residues in the NLS with serine and FGF11b-ΔC with C-terminal truncation. The introduction of mutation in the NLS improved the solubility of FGF11 prepared from E. coli. Exogenous addition of FGF11b and FGF11b-ΔC to BALB3T3 increased cell proliferation, while FGF11a-Mut exerted no effect. FGF11b-ΔC showed higher cell proliferation activity and FGFR signaling than FGF11b. The cell-proliferating activities of FGF11b and FGF11b-ΔC were blocked by an FGFR1 inhibitor or a recombinant FGFR1, confirming the FGFR1-dependent extracellular activity of FGF11b. The analysis of circular dichroism suggested that the C-terminus of FGF11 has an α-helical structure, which may affect its interaction with FGFR1. These results suggest that the N-and C-terminus of recombinant FGF11 are involved in the activation of FGFR1. The above results provide novel insights into the function and mechanism of FGF11 that may aid the development of useful ligands for FGFR regulation.

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Acknowledgements

This research was part of the project titled 'Development of biomedical materials based on marine proteins, funded by the Ministry of Oceans and Fisheries, Korea, and an in-house program (PEA0022) from the Korea Institute of Ocean Science & Technology (KIOST).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Marine Biotechnology Research Center, Korea Institute of Ocean Science and Technology, Busan, 49111, Republic of Korea

    Kyeong Won Lee, Young Jun An, Janet Lee, Jung-Hyun Lee & Hyung-Soon Yim

  2. Department of Chemistry & Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea

    Ye-Eun Jung & Sun-Shin Cha Ko

  3. New Drug Development Center, Osong Medical Innovation Foundation, Cheongju, 28160, Republic of Korea

    In Young Ko, Jonghwa Jin, Ji Hoon Park & Won Kyu Lee

  4. EHLBio, Uiwang, 16006, Republic of Korea

    Kiweon Cha

  5. Department of Marine Biotechnology, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea

    Jung-Hyun Lee

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  1. Kyeong Won Lee
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  2. Young Jun An
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  3. Janet Lee
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  11. Jung-Hyun Lee
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Contributions

JHL and HSY conceived and supervised the study; KWL, YJA, and JL designed and performed the experiments; YEJ, IYK, JJ, and JHP performed the experiments; KWL, KC, and SSC analyzed the data; KWL, YJA, JL, and HSY wrote the manuscript.

Corresponding authors

Correspondence to Jung-Hyun Lee or Hyung-Soon Yim.

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The authors declare no conflict of interests.

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Lee, K.W., An, Y.J., Lee, J. et al. Expression and purification of intracrine human FGF 11 and study of its FGFR-dependent biological activity. J Microbiol. 60, 1086–1094 (2022). https://doi.org/10.1007/s12275-022-2406-3

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  • DOI: https://doi.org/10.1007/s12275-022-2406-3

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