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Structural basis for broad specificity in alpha-lytic protease mutants.

R Bone1, A Fujishige, C A Kettner

  • 1Department of Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco 94143-0448.

Biochemistry
|October 29, 1991
PubMed
Summary
This summary is machine-generated.

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Mutating alpha-lytic protease binding pockets unexpectedly broadened specificity and increased activity. Enzyme flexibility, particularly around Val 217A, explains these broad specificity profiles in protease mutants.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Alpha-lytic protease (alpha-LP) binding pocket mutants were engineered to achieve specific methionine cleavage.
  • Unexpectedly, these mutants exhibited broad specificity and enhanced activity, deviating from the intended outcome.

Purpose of the Study:

  • To elucidate the structural basis for the altered specificity profiles of alpha-LP mutants.
  • To understand how substrate side chains interact with enzyme active sites during transition states.

Main Methods:

  • High-resolution X-ray crystallography was used to determine structures of mutant alpha-LP complexes with peptidylboronic acid inhibitors.
  • Quantitative and qualitative analyses of enzyme-inhibitor interactions, including hydrogen bonds, hydrophobic surface area, cavity volume, and conformational adjustments.

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Main Results:

  • No single structural parameter consistently correlated with enzyme activity or inhibition.
  • Enzyme flexibility, especially involving residue Val 217A, was identified as the primary driver of broad substrate specificity.
  • Observed specificity patterns result from direct substrate-residue interactions and indirect modulation of active-site flexibility.

Conclusions:

  • Altered conformational energetics in mutants lead to broad specificity.
  • Enzyme flexibility is crucial for determining substrate specificity in protease mutants.
  • Peripheral protein interactions modulate active-site flexibility, influencing overall substrate recognition.