| abstract |
The present invention relates to a method of improving heat-stability of a protein by substituting aspartic acid, a hydrophilic amino acid present on the surface of a water-soluble protein, with glutamic acid by the site-specific mutagenesis. The substitution of aspartic acid, a hydrophilic amino acid present on most proteins, with glutamic acid, which is very similar to aspartic acid in both electrostatic feature and molecular weight, can improve the heat stability of a resulting protein without affecting its structure or the function thus enabling to extend its applications to a variety of industrial fields such as medicine, food and chemistry. |