Rescue of conformational dynamics in enzyme catalysis by directed evolution.
Nat Commun
; 9(1): 1314, 2018 04 03.
Article
in En
| MEDLINE
| ID: mdl-29615624
ABSTRACT
Rational design and directed evolution have proved to be successful approaches to increase catalytic efficiencies of both natural and artificial enzymes. Protein dynamics is recognized as important, but due to the inherent flexibility of biological macromolecules it is often difficult to distinguish which conformational changes are directly related to function. Here, we use directed evolution on an impaired mutant of the proline isomerase CypA and identify two second-shell mutations that partially restore its catalytic activity. We show both kinetically, using NMR spectroscopy, and structurally, by room-temperature X-ray crystallography, how local perturbations propagate through a large allosteric network to facilitate conformational dynamics. The increased catalysis selected for in the evolutionary screen is correlated with an accelerated interconversion between the two catalytically essential conformational sub-states, which are both captured in the high-resolution X-ray ensembles. Our data provide a glimpse of an evolutionary trajectory and show how subtle changes can fine-tune enzyme function.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Directed Molecular Evolution
/
Cyclophilin A
Type of study:
Health_economic_evaluation
Limits:
Humans
Language:
En
Journal:
Nat Commun
Journal subject:
BIOLOGIA
/
CIENCIA
Year:
2018
Type:
Article
Affiliation country:
United States