Iodination associated inactivation of β-melanocyte stimulating hormone

Christopher B. Heward, Young C.S. Yang, Tomi K. Sawyer, Marvin D. Bregman, Bryan B. Fuller, Victor J. Hruby, Mac E. Hadley

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22 Scopus citations


Contrary to other published reports, iodinated β-melanocyte stimulating hormone (β-MSH) is without biological activity as measured by frog skin bioassay, melanoma (mouse S-91) adenylate cyclase assay, or melanoma tyrosinase assay. Inactivation results in part from oxidation of the methionine residue by the chloramine T and sodium metabisulfite used in the iodination reaction. Replacement of the methionine of β-MSH with norleucine by solid phase synthesis results in an analogue which is more resistant, but not completely resistant, to inactivation. Thus, in order to obtain a biologically active radioligand for radioreceptor studies, further tailoring of the hormone and/or modification of the iodination procedure will be needed.

Original languageEnglish (US)
Pages (from-to)266-273
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - May 14 1979

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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