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Roles of the two tryptophane residues of dimeric arginine kinase (AK) were individually investigated by site-directed mutagenesis. Both residues were fully conserved in the phosphogen kinase family and the mutant proteins were analyzed by enzyme kinetics, fluorescence spectroscopy, fluorescence quenching experiments, thermal stability and conformational stability. Our studies revealed that Trp-218...
A mutant of dimeric rabbit muscle creatine kinase (CK), in which six residues (residues 2-7) at the N-terminal were removed by the PCR method, was studied to assess the role of these residues in dimer cohesion and to determine the structural stability of the protein. The specific activity of the mutant was 70.39% of that of the wild-type CK, and the affinity for Mg-ATP and CK substrates was slightly...
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