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Related Experiment Videos

Structure-function analysis of the 7B2 CT peptide.

E V Apletalina1, M A Juliano, L Juliano

  • 1Department of Biochemistry, Louisiana State University Health Sciences Center, New Orleans, Louisiana, 70112, USA.

Biochemical and Biophysical Research Communications
|February 16, 2000
PubMed
Summary
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The neuroendocrine protein 7B2 carboxyl-terminal (CT) peptide potently inhibits prohormone convertase 2 (PC2). Key residues and the peptide backbone are crucial for this specific inhibition, with the Lys-Lys pair essential for initial binding.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Prohormone convertases (PCs) are essential enzymes for processing protein precursors.
  • Prohormone convertase 2 (PC2) is a key enzyme in neuroendocrine pathways.
  • The neuroendocrine protein 7B2 and its carboxyl-terminal (CT) peptide are known inhibitors of PC2.

Purpose of the Study:

  • To identify the specific residues and structural features of the 7B2 CT peptide responsible for PC2 inhibition.
  • To elucidate the binding mechanism of the CT peptide to the PC2 active site.

Main Methods:

  • N-terminal truncation of the CT peptide.
  • Alanine scanning mutagenesis of the CT peptide.
  • Synthesis and testing of stereoisomeric analogues (all-d-retro-inverso, all-l-inverso, all-d).

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  • Competitive inhibition assays.

    • Main Results:

    • Removal of the first three N-terminal residues significantly reduced inhibitory activity (>190-fold).
    • Alanine scanning revealed that residues Gln7, Gln9, and Asp12 are critical for maintaining mid-nanomolar inhibitory potency.
    • Stereoisomeric analogues were inactive, indicating the importance of both side-chain and backbone interactions.
    • The Lys-Lys pair at the N-terminus is essential for initial binding to the PC2 active site, as competitive inhibition assays failed with truncated forms.

    Conclusions:

    • The 7B2 CT peptide inhibits PC2 through specific interactions involving key residues and the peptide backbone.
    • The N-terminal Lys-Lys motif is critical for the initial recognition and binding of the CT peptide to PC2.
    • Understanding these interactions provides insights into PC2 regulation and potential therapeutic strategies.