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The Val28-->Gly single mutant at the subunit interface of Cu,Zn superoxide dismutase from Photobacterium leiognathi displays a k(cat)/K(M) value of 1.7x10(10) M(-1) s(-1), twice that of the native enzyme. Analysis of the three-dimensional structure indicates that the active site Cu,Zn center is not perturbed, slight structural deviations being only localized in proximity of the mutation site. The enzyme-substrate association rate, calculated by Brownian dynamics simulation, is identical for both enzymes, indicating that the higher catalytic efficiency of the Val28-->Gly mutant is not due to a more favorable electrostatic potential distribution. This result demonstrates the occurrence of an intramolecular communication between the mutation site and the catalytic center, about 18 A away and indicates a new strategy to encode extra efficiency within other members of this enzymatic family.

Type

Journal article

Journal

FEBS Lett

Publication Date

13/10/2000

Volume

483

Pages

17 - 20

Keywords

Amino Acid Substitution, Binding Sites, Genetic Engineering, Hydrogen-Ion Concentration, Mutation, Photobacterium, Protein Structure, Tertiary, Protein Subunits, Substrate Specificity, Superoxide Dismutase