Process for manufacturing cyclosporin a by highly productive...

C - Chemistry – Metallurgy – 12 – N

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C12N 1/14 (2006.01) C07K 7/64 (2006.01) C12P 21/04 (2006.01)

Patent

CA 2202037

The present invention relates to a process for making a highly productive fusant of Tolypocladium inflatum, a producing strain of cyclosporin A with immunosuppressive property wherein the selection of the fusant KD461, designed to produce a large amount of cyclosporin A, was made available by the following steps of: developping amino acid-dependent mutant of Tolypocladium inflatum, wild strain isolated from soil, which induced by UV radiation: conjugating L-valine-dependent and L-leucine-dependent mutant to promote the demand and utility of L-valine and L-leucine, precursors of cyclosporin A, together with organic nitrogen-source. The fusant KD461 has following characteristics in comparison with wild strain: a) in a solid medium, slowly growing in a malt-yeast extract agar medium, b) darker as light grey color in colony, c) backside of colony with dark brown, d) in a liquid medium short and thick hyphae with many arthrospore.

Procédé de fabrication d'un fusant à haut rendement de Tolypocladium inflatum, c'est-à-dire une souche produisant la cyclosporine A à propriété immunosuppressive. Afin de permettre la sélection du fusant KD461, conçu pour produire une quantité importante de cyclosporine A, le procédé consiste à élaborer un mutant dépendant d'acides aminés de la souche sauvage Tolypocladium inflatum, isolée à partir de la terre à l'aide d'un rayonnement ultraviolet, et à conjuguer un mutant dépendant de L-valine et de L-leucine afin de favoriser la demande et l'utilité de L-valine et de L-leucine, des précurseurs de cyclosporine A, conjointement avec une source d'azote organique. Le fusant KD461 présente les caractéristiques suivantes, en comparaison avec la souche sauvage: (a) il présente, en milieu solide, une croissance lente dans un milieu à gélose à base d'un extrait de levure et de malt, (b) la surface de la colonie est plus foncée car elle est de couleur gris foncé, (c) la face arrière de la colonie est de couleur brun foncé, et (d) il a, en milieu liquide, des hyphes courtes et épaisses à arthrospores nombreuses.

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