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Efficient catalytic promiscuity for chemically distinct reactions.

Ann C Babtie¹, Subhajit Bandyopadhyay, Luis F Olguin

¹Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.

Angewandte Chemie (International Ed. in English)

|April 18, 2009

Summary

Pseudomonas aeruginosa arylsulfatase (PAS) exhibits high catalytic efficiency in both native and promiscuous reactions. This suggests that enzymes can achieve both high activity and specificity, challenging traditional biochemical trade-offs.

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Area of Science:

Biochemistry
Enzymology
Structural Biology

Background:

Enzyme specificity and activity are often considered to be in opposition.
Pseudomonas aeruginosa arylsulfatase (PAS) is a known enzyme with potential for broad substrate acceptance.

Purpose of the Study:

To investigate the catalytic proficiencies of PAS for its native and promiscuous reactions.
To explore the relationship between enzyme activity and specificity in PAS.

Main Methods:

Analysis of catalytic proficiencies for native and promiscuous reactions.
Determination of binding constants (K(tx)) for transition states.
Structural analysis of substrate-enzyme interactions.

Main Results:

PAS demonstrates high catalytic proficiency for both its native and promiscuous reactions.
Binding constants indicate efficient transition state stabilization for multiple substrates.
The observed data challenges the conventional view of a strict trade-off between enzyme activity and specificity.

Conclusions:

The study suggests that the trade-off between high activity and tight specificity can be significantly relaxed in enzymes like PAS.
PAS serves as a model for enzymes that can achieve broad catalytic capabilities without compromising efficiency.