1YSB image
Entry Detail
PDB ID:
1YSB
Keywords:
Title:
Yeast Cytosine Deaminase Triple Mutant
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-02-08
Release Date:
2005-05-17
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.18
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cytosine deaminase
Mutations:A23L, V108I, I140L
Chain IDs:A, B
Chain Length:161
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
Primary Citation
Computational thermostabilization of an enzyme.
Science 308 857 860 (2005)
PMID: 15879217 DOI: 10.1126/science.1107387

Abstact

Thermostabilizing an enzyme while maintaining its activity for industrial or biomedical applications can be difficult with traditional selection methods. We describe a rapid computational approach that identified three mutations within a model enzyme that produced a 10 degrees C increase in apparent melting temperature T(m) and a 30-fold increase in half-life at 50 degrees C, with no reduction in catalytic efficiency. The effects of the mutations were synergistic, giving an increase in excess of the sum of their individual effects. The redesigned enzyme induced an increased, temperature-dependent bacterial growth rate under conditions that required its activity, thereby coupling molecular and metabolic engineering.

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