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Related Experiment Videos

Cation-dependent stability of subtilisin.

P A Alexander1, B Ruan, P N Bryan

  • 1Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, Maryland 20850, USA.

Biochemistry
|August 29, 2001
PubMed
Summary
This summary is machine-generated.

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Cation binding at site B in subtilisin BPN' has minimal impact on stability with monovalent cations. Calcium binding at site A significantly stabilizes subtilisin, reducing inactivation rates.

Area of Science:

  • Biochemistry
  • Protein Stability
  • Enzyme Kinetics

Background:

  • Subtilisin BPN' possesses two cation binding sites (A and B) influencing its stability.
  • Cation binding contributes to the native state stability and increases unfolding activation energy.
  • Distinguishing the roles of site A and site B in subtilisin inactivation is complex.

Purpose of the Study:

  • To investigate the stabilizing effects of cation binding specifically at site B.
  • To utilize a mutant subtilisin BPN' lacking the calcium-specific site A for this analysis.

Main Methods:

  • Employing a mutant subtilisin BPN' lacking calcium site A.
  • Titrating the mutant with calcium in the presence of moderate monovalent cations (NaCl).
  • Monitoring changes in inactivation rates as a function of cation concentration.

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Main Results:

  • Calcium binding at site B shows minimal stability enhancement when monovalent cations occupy the site.
  • At 100 mM NaCl, site B is predominantly occupied by sodium, with little change upon calcium addition.
  • Sodium-to-calcium exchange at site B reduces inactivation rate fivefold.
  • Calcium binding at site A dramatically reduces inactivation rate (approx. 200-fold) regardless of monovalent cation concentration.

Conclusions:

  • Site A's high calcium selectivity is the primary driver of subtilisin stabilization by calcium.
  • Site B's contribution to stability is less significant, especially in the presence of monovalent cations.
  • Understanding differential cation binding is crucial for predicting and controlling enzyme stability.