Open AccessExploring the role of a glycine cluster in cold adaptation of an alkaline phosphatase
Author(s) -
Mavromatis Konstantinos,
Tsigos Iason,
Tzanodaskalaki Maria,
Kokkinidis Michael,
Bouriotis Vassilis
Publication year - 2002
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1046/j.1432-1033.2002.02895.x
Subject(s) - enzyme , mutagenesis , psychrophile , alkaline phosphatase , glycine , biochemistry , mutant , site directed mutagenesis , chemistry , cluster (spacecraft) , adaptation (eye) , strain (injury) , enzyme assay , biology , gene , amino acid , anatomy , neuroscience , computer science , programming language
In an effort to explore the role of glycine clusters on the cold adaptation of enzymes, we designed point mutations aiming to alter the distribution of glycine residues close to the active site of the psychrophilic alkaline phosphatase from the Antarctic strain TAB5. The mutagenesis targets were residues Gly261 and Gly262. The replacement of Gly262 by Ala resulted in an inactive enzyme. Substitution of Gly261 by Ala resulted to an enzyme with lower stability and increased energy of activation. The double mutant G261A/Y269A designed on the basis of side‐chain packing criteria from a modelled structure of the enzyme resulted in restoration of the energy of activation to the levels of the native enzyme and in an increased stability compared to the mutant G261A. It seems therefore, that the Gly cluster in combination with its structural environment plays a significant role in the cold adaptation of the enzyme.