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Mutational analysis of evolutionarily conserved ACTH residues.

Jessica L Costa1, Stephanie Bui, Peggy Reed

  • 1Developmental Biology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA. jcosta@du.edu

General and Comparative Endocrinology
|February 26, 2004
PubMed
Summary

Investigating the 10 C-terminal amino acids of adrenocorticotropin (ACTH) reveals their crucial role in steroidogenesis. Specific mutations impact ACTH activity, with some enhancing it, highlighting the complex structure-function relationship.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Biochemistry

Background:

  • Adrenocorticotropin (ACTH) and alpha-Melanocyte stimulating hormone (MSH) share sequence similarity, differing in the C-terminal 10 amino acids of ACTH.
  • These C-terminal residues are highly conserved across vertebrate evolution, suggesting significant functional importance.

Purpose of the Study:

  • To elucidate the functional significance of the C-terminal 10 amino acids of ACTH (ACTH1-24) in steroidogenic activity.
  • To investigate the impact of specific amino acid mutations on ACTH receptor binding, activation, and serum stability.

Main Methods:

  • In vitro and in vivo studies were conducted to analyze the effects of alanine substitutions and other mutations within the C-terminal residues of ACTH1-24.
  • Mutant peptides were assessed for their steroidogenic activity and receptor binding capabilities.

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Main Results:

  • Alanine substitutions in the basic core residues (KKRR, 15-18) significantly reduced ACTH activity, indicating the importance of these side chains for receptor interaction.
  • Partial restoration of activity was observed when alanine mutations at positions 15 and 17 were replaced with glutamine.
  • Conversion of the five C-terminal residues (20-24) to alanines unexpectedly increased in vivo ACTH activity, suggesting their role in peptide length rather than direct receptor interaction for activity.

Conclusions:

  • Amino acid residues 15-18 are critical for ACTH receptor binding and activation due to their specific side chains.
  • The C-terminal residues 20-24 primarily contribute to peptide length for receptor activity but are significant for serum stability via their side chains.