Chondroitinases i and ii, methods of preparation, and use...

C - Chemistry – Metallurgy – 12 – N

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C12N 9/88 (2006.01) A61K 38/46 (2006.01) A61K 38/51 (2006.01) C12N 9/16 (2006.01) C12Q 1/34 (2006.01) C12Q 1/527 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2188159

Chondroitinase II, a protein having an isoelectric point of approximately 8.4-8.45 and an apparent molecular mass of 112 kDa when electrophoresed in a 4 to 20 % gradient acrylamide gel in 25 mM Tris/192 mM glycine buffer at pH 8.5 in the presence of about 0.1 % (w/v) SDS, has been isolated and purified. A process for the copurification by affinity chromatography of the chondroitinase I and chondroitinase II proteins produced by Proteus vulgaris is also provided. The proteins can be further purified by metal chelating chromatography. Therapeutic or surgical compositions of isolated chondroitinases I and II or the copurified mixture of chondroitinases I and II are also disclosed. These compositions are used in a method for selectively and completely disinserting the vitreous body from the neural retina of an eye.

On a isolé et purifié la chondroitinase II, une protéine dont le point isoélectrique se situe entre environ 8,4 et 8,45, et d'un poids moléculaire apparent de 112 kDa lorsqu'elle est soumise à une électrophorèse sur un gel d'acrylamide d'un gradient de 4 à 20 %, dans un tampon de 192 mM glycine /25mM Tris, à un pH de 8,5 et en présence d'environ 0,1 % (poids/volume) de SDS. L'invention se rapporte également à un procédé de co-purification par chromatographie à affinité des protéines chondroitinase I et chondroitinase II produites par Proteus vulgaris. Ces protéines peuvent être davantage purifiées par chromatographie à chélation métallique. Des compositions thérapeutiques ou chirurgicales des chondroitinases I et II isolées ou du mélange co-purifié des chondroitinases I et II sont également décrites, ces compositions étant utilisées dans un procédé permettant d'extraire sélectivement et entièrement le corps vitré de la rétine neurale d'un oeil.

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