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Temperature-induced conformational changes in prosomatostatin-II: implications for processing

J Mitra1, X Tang, S C Almo

  • 1Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.

The Biochemical Journal
|August 7, 1998
PubMed
Summary
This summary is machine-generated.

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The propeptide of somatostatin (SRIF) contains structural information for intracellular sorting. Recombinant anglerfish proSRIF-II exists in monomeric and dimeric forms with distinct secondary structures, suggesting multiple folding states.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Somatostatin (SRIF) is a peptide hormone processed from prosomatostatin (proSRIF).
  • The propeptide of SRIF is known to mediate intracellular sorting.
  • The structural basis for this sorting information is yet to be fully elucidated.

Purpose of the Study:

  • To investigate the structural features of recombinant anglerfish proSRIF-II.
  • To identify potential sorting domains within the prohormone structure.

Main Methods:

  • Recombinant anglerfish proSRIF-II was purified from Escherichia coli.
  • Circular Dichroism (CD) analyses were performed to assess secondary structure.
  • Thermal denaturation studies (heating and cooling cycles) were conducted.

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Main Results:

  • Two species of proSRIF-II were identified: a monomer and a disulfide-linked dimer.
  • Monomeric proSRIF-II exhibited minimal secondary structure but adopted an alpha-helical conformation upon slow heating and cooling, which was stable.
  • Dimeric proSRIF-II was predominantly alpha-helical and showed no significant change in helicity upon thermal cycling.

Conclusions:

  • Anglerfish proSRIF-II can exist in multiple folding states, including monomeric and dimeric forms.
  • The distinct structural properties of these forms suggest they may represent different folding intermediates.
  • These findings contribute to understanding the structural basis of prohormone sorting.