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Crystal structure of the protealysin precursor: insights into propeptide function.

Ilya V Demidyuk1, Tania Yu Gromova, Konstantin M Polyakov

  • 1Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Sq. 2, Moscow 123182, Russia. duk@img.ras.ru

The Journal of Biological Chemistry
|November 17, 2009
PubMed
Summary

The crystal structure of protealysin precursor (proPLN) reveals unique features, including a propeptide domain that inhibits catalytic activity. This finding suggests protealysin-like enzymes may form a distinct subfamily within thermolysin-like proteases.

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Area of Science:

  • Biochemistry and Structural Biology
  • Enzymology
  • Protein Crystallography

Background:

  • Protealysin (PLN) is a peptidase in the M4 family, known as thermolysin-like proteases (TLPs).
  • TLPs are synthesized as precursors with N-terminal propeptides, categorized into long (approx. 200 amino acids) and short (approx. 50 amino acids) groups.
  • Protealysin represents the prototype for TLPs with short propeptides.

Purpose of the Study:

  • To determine the 1.8 Å crystal structure of the protealysin precursor (proPLN).
  • To elucidate the structural features of the first determined TLP precursor.
  • To understand the role of the propeptide in regulating PLN activity.

Main Methods:

  • X-ray crystallography
  • Structure determination at 1.8 Å resolution
  • Comparative structural analysis of catalytic and precursor domains

Main Results:

  • The crystal structure of proPLN was determined, revealing a catalytic domain similar to mature TLPs but with distinct features.
  • Key differences include the absence of calcium-binding sites and altered N-terminal and substrate-binding regions.
  • The propeptide forms a separate domain, likely inhibiting catalysis by blocking the active site and maintaining an inactive conformation.

Conclusions:

  • The propeptide of protealysin acts as an intrinsic inhibitor, interacting with the active site via a conserved PPL motif.
  • The observed structural features of proPLN are likely characteristic of all protealysin-like enzymes with short propeptides.
  • These findings support the classification of protealysin-like enzymes as a distinct subfamily of thermolysin-like proteases.