Shionogi Company Limited

Tatsushi Oka

Kazuyuki Morihara

Hiroshige Tsuzuki

Takeharu Masaki

Masami Soejima

A process for preparing a B30-threonine-insulin which comprising reacting a des-B30-insulin with an excess amount of threonine derivative in the presence of an enzyme specifically acting on the basic-amino-acid carbonyl in peptide bondings.

Semi-synthesis of human insulin

A process for preparing B30-threonine-insulin which comprising reacting a des-B30-insulin with an excess amount of threonine derivative in the presence of an enzyme specifically acting on a lysine carbonyl in peptide bondings and produced by Achromobacter lyticus M 497-1.

A process for preparing a B30-threonine-insulin which comprising reacting a des-B30-insulin with an excess amount of threonine derivative in the presence of an enzyme specifically acting on a lysine carbonyl in peptide bondings and produced by Achromobacter lyticus M 497-1.

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Osaka, Japan

Tatsushi Oka