Monomeric activin A retains high receptor binding affinity but exhibits low biological activity

Petra Hüsken-Hindi, Kunihiro Tsuchida, Minkyu Park, Anne Z. Corrigan, Joan M. Vaughan, Wylie W. Vale, Wolfgang H. Fischer

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Activins are multipotent hormones/growth factors that belong to the transforming growth factor-β (TGF-β) superfamily. Like TGF-βs, activins have 9 conserved cysteine residues and are disulfide-bonded dimers. Based on the three-dimensional structure of TGF-β2, we deduced Cys80 in activin A to form the intermolecular disulfide bond. To obtain a monomeric form of activin, Cys80 was exchanged for a serine residue by polymerase chain reaction mutagenesis. The mutant protein was expressed in a baculovirus/insect cell expression system. The molecular mass of this mutant activin was determined to be 13 kDa (consistent with a single chain form of the protein) by SDS-polyacrylamide gel electrophoresis and by laser desorption mass spectroscopy. When this mutant monomeric activin was incubated with cells that expressed either the activin type IIB receptor or both the type I and type IIB receptors, its affinity was found to be 20% of that of native activin on a mass basis. Binding affinity determined using the mouse pituitary cell line AtT 20 was 10% of that of native activin A. Biological potency, however, as determined by the mutant protein's ability to release FSH from anterior pituitary cells in primary culture and by its ability to suppress basal ACTH secretion form AtT 20 cells, was only 1% of that of the native protein. This discrepancy of an order of magnitude between binding and biological activity is consistent with a model in which dimerization of the hormone is not necessary for high affinity binding to its receptor(s) while being essential for efficient signal transduction.

Original languageEnglish
Pages (from-to)19380-19384
Number of pages5
JournalJournal of Biological Chemistry
Volume269
Issue number30
Publication statusPublished - 29-07-1994

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Activins
Bioactivity
Transforming Growth Factors
Mutant Proteins
Disulfides
Hormones
Signal transduction
Mutagenesis
Primary Cell Culture
Dimerization
Baculoviridae
Polymerase chain reaction
Molecular mass
Electrophoresis
Dimers
Adrenocorticotropic Hormone
Serine
Cysteine
Insects
activin A

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Hüsken-Hindi, P., Tsuchida, K., Park, M., Corrigan, A. Z., Vaughan, J. M., Vale, W. W., & Fischer, W. H. (1994). Monomeric activin A retains high receptor binding affinity but exhibits low biological activity. Journal of Biological Chemistry, 269(30), 19380-19384.
Hüsken-Hindi, Petra ; Tsuchida, Kunihiro ; Park, Minkyu ; Corrigan, Anne Z. ; Vaughan, Joan M. ; Vale, Wylie W. ; Fischer, Wolfgang H. / Monomeric activin A retains high receptor binding affinity but exhibits low biological activity. In: Journal of Biological Chemistry. 1994 ; Vol. 269, No. 30. pp. 19380-19384.
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abstract = "Activins are multipotent hormones/growth factors that belong to the transforming growth factor-β (TGF-β) superfamily. Like TGF-βs, activins have 9 conserved cysteine residues and are disulfide-bonded dimers. Based on the three-dimensional structure of TGF-β2, we deduced Cys80 in activin A to form the intermolecular disulfide bond. To obtain a monomeric form of activin, Cys80 was exchanged for a serine residue by polymerase chain reaction mutagenesis. The mutant protein was expressed in a baculovirus/insect cell expression system. The molecular mass of this mutant activin was determined to be 13 kDa (consistent with a single chain form of the protein) by SDS-polyacrylamide gel electrophoresis and by laser desorption mass spectroscopy. When this mutant monomeric activin was incubated with cells that expressed either the activin type IIB receptor or both the type I and type IIB receptors, its affinity was found to be 20{\%} of that of native activin on a mass basis. Binding affinity determined using the mouse pituitary cell line AtT 20 was 10{\%} of that of native activin A. Biological potency, however, as determined by the mutant protein's ability to release FSH from anterior pituitary cells in primary culture and by its ability to suppress basal ACTH secretion form AtT 20 cells, was only 1{\%} of that of the native protein. This discrepancy of an order of magnitude between binding and biological activity is consistent with a model in which dimerization of the hormone is not necessary for high affinity binding to its receptor(s) while being essential for efficient signal transduction.",
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Hüsken-Hindi, P, Tsuchida, K, Park, M, Corrigan, AZ, Vaughan, JM, Vale, WW & Fischer, WH 1994, 'Monomeric activin A retains high receptor binding affinity but exhibits low biological activity', Journal of Biological Chemistry, vol. 269, no. 30, pp. 19380-19384.

Monomeric activin A retains high receptor binding affinity but exhibits low biological activity. / Hüsken-Hindi, Petra; Tsuchida, Kunihiro; Park, Minkyu; Corrigan, Anne Z.; Vaughan, Joan M.; Vale, Wylie W.; Fischer, Wolfgang H.

In: Journal of Biological Chemistry, Vol. 269, No. 30, 29.07.1994, p. 19380-19384.

Research output: Contribution to journalArticle

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AU - Hüsken-Hindi, Petra

AU - Tsuchida, Kunihiro

AU - Park, Minkyu

AU - Corrigan, Anne Z.

AU - Vaughan, Joan M.

AU - Vale, Wylie W.

AU - Fischer, Wolfgang H.

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Hüsken-Hindi P, Tsuchida K, Park M, Corrigan AZ, Vaughan JM, Vale WW et al. Monomeric activin A retains high receptor binding affinity but exhibits low biological activity. Journal of Biological Chemistry. 1994 Jul 29;269(30):19380-19384.