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Plant Cell Reports

, Volume 30, Issue 7, pp 1327–1338 | Cite as

Recombinant expression of homodimeric 660 kDa human thyroglobulin in soybean seeds: an alternative source of human thyroglobulin

  • Rebecca Powell
  • Laura C. Hudson
  • Kevin C. Lambirth
  • Diane Luth
  • Kan Wang
  • Kenneth L. Bost
  • Kenneth J. PillerEmail author
Original Paper

Abstract

Soybean seeds possess many qualities that make them ideal targets for the production of recombinant proteins. However, one quality often overlooked is their ability to stockpile large amounts of complex storage proteins. Because of this characteristic, we hypothesized that soybean seeds would support recombinant expression of large and complex proteins that are currently difficult or impossible to express using traditional plant and non-plant-based host systems. To test this hypothesis, we transformed soybeans with a synthetic gene encoding human thyroglobulin (hTG)—a 660 kDa homodimeric protein that is widely used in the diagnostic industry for screening and detection of thyroid disease. In the absence of a recombinant system that can produce recombinant hTG, research and diagnostic grade hTG continues to be purified from cadaver and surgically removed thyroid tissue. These less-than-ideal tissue sources lack uniform glycosylation and iodination and therefore introduce variability when purified hTG is used in sensitive ELISA screens. In this study, we report the successful expression of recombinant hTG in soybean seeds. Authenticity of the soy-derived protein was demonstrated using commercial ELISA kits developed specifically for the detection of hTG in patient sera. Western analyses and gel filtration chromatography demonstrated that recombinant hTG and thyroid-purified hTG are biologically similar with respect to size, mass, charge and subunit interaction. The recombinant protein was stable over three generations and accumulated to ~1.5% of total soluble seed protein. These results support our hypothesis that soybeans represent a practical alternative to traditional host systems for the expression of large and complex proteins.

Keywords

Recombinant expression Transgenic soybean Human thyroglobulin Soybean seeds Targeted expression 

Notes

Acknowledgments

The authors gratefully thank Dr. Scott Olenych and the confocal microscopy group at the David H. Murdock Research Institute for assistance with confocal microscopy, and Dr. Dan Nelson for stimulating discussions and critical reading of the manuscript. This work was supported in part by NIH grant R43CA150324 to K.J.P.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Rebecca Powell
    • 1
  • Laura C. Hudson
    • 2
  • Kevin C. Lambirth
    • 2
  • Diane Luth
    • 3
  • Kan Wang
    • 3
  • Kenneth L. Bost
    • 1
    • 2
  • Kenneth J. Piller
    • 1
    • 2
    Email author
  1. 1.Department of BiologyUniversity of North Carolina at CharlotteCharlotteUSA
  2. 2.SoyMeds, Inc.DavidsonUSA
  3. 3.Department of AgronomyIowa State UniversityAmesUSA

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