Low oxygen affinity mutant hemoglobins

C - Chemistry – Metallurgy – 12 – N

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C12N 15/12 (2006.01) A61K 38/42 (2006.01) C07H 17/00 (2006.01) C07K 14/805 (2006.01) C12N 15/09 (2006.01) C12P 21/06 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2414028

Non-naturally occurring mutant hemoglobins rHb (bN108Q) and rHb (bL105W) are provided that have a lower oxygen affinity than that of native hemoglobin, but high cooperativity in oxygen binding. rHb (bN108Q) also exhibits enhanced stability against autoxidation. The mutant hemoglobins are preferably produced by recombinant DNA techniques. Such mutanthemoglobins may be used as a component of a blood substitute and hemoglobin therapeutics.

La présente invention concerne des formes mutantes d'hémoglobine n'existant pas à l'état naturel, en l'occurrence les rHB (.beta.N108Q) et rHB (.beta.L105W) et se distinguant par une affinité pour l'oxygène inférieure à celle de l'hémoglobine native, tout en présentant une coopérativité élevée dans la liaison oxygénique. La rHB (.beta.N108Q) fait preuve également d'une stabilité renforcée contre l'oxydation spontanée. Ces hémoglobines mutantes s'obtiennent de préférence par des procédés faisant intervenir une recombinaison de l'ADN. De telles hémoglobines mutantes, qui conviennent comme composants de substituts sanguins, sont particulièrement utilisables en thérapie hémoglobinique.

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