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The C-terminal sequence encodes function in serine proteases.

M M Krem1, T Rose, E Di Cera

  • 1Department of Biochemistry, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Biological Chemistry
|September 25, 1999
PubMed
Summary
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The C-terminal sequence of chymotrypsin serine proteases drives functional diversity and substrate specificity. This evolutionary optimization aids in identifying functions of new genes within this enzyme class.

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Enzymology

Background:

  • Serine proteases, particularly the chymotrypsin family, exhibit remarkable functional diversity despite conserved structures.
  • Enzymatic activity and substrate specificity are crucial for biological functions.

Purpose of the Study:

  • To investigate the evolutionary drivers of functional diversity in chymotrypsin serine proteases.
  • To identify the specific sequence regions responsible for substrate specificity and catalytic modulation.

Main Methods:

  • Comparative sequence analysis of serine proteases.
  • Structure-function relationship studies focusing on active site residues.
  • Evolutionary trajectory analysis of protease gene families.

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Main Results:

  • The C-terminal portion of the protease domain fully accounts for functional diversity and substrate specificity.
  • This C-terminal region contains key residues for substrate binding at unprimed subsites (P1-P3).
  • Evolutionary optimization targeted this short C-terminal sequence for enhanced catalytic activity and specificity.

Conclusions:

  • The C-terminal sequence is the primary determinant of functional divergence in chymotrypsin serine proteases.
  • Understanding this evolutionary mechanism facilitates the functional annotation of newly discovered serine protease genes.