Endocrine

, Volume 14, Issue 2, pp 205–212 | Cite as

High-level bacterial expression of a natively folded, soluble extracellular domain fusion protein of the human luteinizing hormone/chorionic gonadotropin receptor in the cytoplasm of Escherichia coli

  • Leslie I. Lobel
  • Susan Pollak
  • Jeffrey Klein
  • Joyce W. Lustbader
Article

Abstract

We have expressed the extracellular domain of the human luteinizing hormone/chorionic gonadotropin (hLH/CG) receptor as a fusion protein with thioredoxin in the cytoplasm of an Escherichia coli strain that contains mutations in both the thioredoxin reductase and glutathione reductase genes. The chimeric protein isolated following induction of expression is purified in a soluble form and binds hCG with an affinity approximating that of native receptor. This truncated form of the receptor displays the same specificity as intact hLH/CG receptor and does not bind human follicle stimulating hormone. This cytoplasmically produced protein is expressed at levels that exceed 10 mg/L. Expression of properly folded extracellular domain of the hLH/CG receptor in the cytoplasm of E. coli allows the facile and economic purification of large quantities of material. This will facilitate the determination of the structure of the hormone-binding domain of the glycoprotein receptor as well as the production of epitope-specific antibodies.

Key Words

Human luteinizing hormone/chorionic gonadotropin receptor chorionic gonadotropin bacterial expression fusion protein 

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Copyright information

© Humana Press Inc 2001

Authors and Affiliations

  • Leslie I. Lobel
    • 1
  • Susan Pollak
    • 1
  • Jeffrey Klein
    • 1
  • Joyce W. Lustbader
    • 1
  1. 1.Center for Reproductive Science, Department of Obstetrics and GynecologyColumbia UniversityNew York

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