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Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Tuning Selectivity in CalA Lipase: Beyond Tunnel Engineering.

Lorea Alejaldre1,2,3, Claudèle Lemay-St-Denis1,2,3, Joelle N Pelletier1,2,3,4

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Summary

Candida antarctica lipase A (CalA) engineering reveals distal enzyme regions influence substrate selectivity. Epistatic interactions and dynamic binding site changes tune specificity for different fatty acid ester chain lengths.

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Protein Chemistry

Background:

  • Candida antarctica lipase A (CalA) is known for selective fatty acid ester hydrolysis.
  • Substrate selectivity is primarily attributed to its acyl-chain binding tunnel.
  • Modulating steric hindrance within the tunnel can tune chain length preference.

Purpose of the Study:

  • To investigate the role of distal enzyme regions, beyond the substrate tunnel, in modulating CalA's substrate selectivity.
  • To understand how substitutions in both tunnel and distal regions affect enzyme specificity.
  • To elucidate the mechanisms underlying CalA's diverse selectivity profiles.

Main Methods:

  • Engineering of CalA variants with substitutions in substrate tunnel and distal regions.
  • Experimental determination of substrate selectivity using natural and synthetic fatty acid esters.
  • Computational characterization of protein dynamics and substrate tunnels.

Main Results:

  • Substitutions in distal regions, in addition to the tunnel, significantly modulate substrate selectivity.
  • Epistatic interactions between substitutions contribute to specificity for long-chain or short/medium-chain fatty acid esters.
  • Observed mechanisms include reshaping tunnel morphology, stabilization, and obstruction of the binding tunnel.

Conclusions:

  • Enzyme selectivity is not solely determined by the substrate-binding tunnel; distal regions play a crucial role.
  • CalA exhibits a dynamic substrate-binding region, enabling diverse selectivity profiles through various mechanisms.
  • This study enhances understanding of lipase versatility for diverse biocatalytic applications.