Polypeptide having a phytase activity and nucleotide...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 9/16 (2006.01) C12N 15/55 (2006.01) C12N 15/63 (2006.01)

Patent

CA 2583762

The invention relates to a recombinant DNA molecule coding for a polypeptide having a phytase activity after expression in a procaryotic or eucaryotic host cell. Said recombinant DNA molecule comprises a DNA sequence selected from a) DNA sequences that have been obtained by variations of the mature wild type E.coli phytase sequence, at least one amino acid being mutated between positions 189 and 211 and/or between positions 137 and 152 in comparison to the wild type sequence; b) DNA sequences having a homology of between 70 % and 100 % in relation to the sequences according to a); and c) DNA sequences related to the sequences according to a) and b) as a result of the degeneracy of the genetic code. During the expression of the recombinant DNA molecule in an adapted host cell, said recombinant DNA molecule is associated with an increased activity of the thus coded protein in the culture supernatant. The invention also relates to thus coded proteins.

L'invention concerne une molécule d'ADN de recombinaison codant un polypeptide présentant une activité de phytase après expression dans une cellule hôte procaryote ou eucaryote. Ladite molécule d'ADN de recombinaison comporte une séquence d'ADN choisie parmi a) des séquences d'ADN obtenues par variations du type sauvage mûr de la séquence de phytase de E.coli, au moins un acide aminé étant muté entre les positions 189 et 211 et/ou entre les positions 137 et 152 par rapport à la séquence de type sauvage ; b) des séquences d'ADN présentant une homologie de 70 à 100 % par rapport aux séquences a) ; et c) des séquences d'ADN apparentées aux séquences a) et b) en raison de la dégénérescence du code génétique. Lors de l'expression dans une cellule hôte adaptée, ladite molécule d'ADN de recombinaison est associée à une activité augmentée de la protéine ainsi codée dans la culture. L'invention concerne également les protéines ainsi codées.

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