Iron-regulated metal transporters and uses therefor

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/29 (2006.01) A01H 5/00 (2006.01) A23L 1/305 (2006.01) B09C 1/00 (2006.01) C07K 14/415 (2006.01) C07K 16/16 (2006.01) C07K 19/00 (2006.01) G01N 33/566 (2006.01) A61K 35/78 (1995.01)

Patent

CA 2187728

Isolated nucleic acid molecules encoding novel members of the IRT family of polypeptides which include, in a preferred embodiment, at least one transmembrane domain having at least about 30%, more preferably at least about 45%, 60% or 70% amino acid sequence identity with SEQ ID NO: 2 and/or at least one histidine rich domain, are described. The IRT1 polypeptides of the invention are capable of transporting metals such as Fe(II), Cd, Co, Mn, Pb, Hg and Zn. Transgenic plants in which expression of an IRT polypeptide of the invention is altered are also described. These transgenic plants can be used to remove pollutants from soil or as nutritional supplements to treat iron-deficiency. Antisense nucleic acid molecules, recombinant expression vectors containing nucleic acid molecules of the invention, and host cells into which the expression vectors have been introduced are also described. The invention further provides isolated IRT polypeptides, fusion polypeptides and active fragments thereof. Therapeutic methods utilizing compositions of the invention are also provided.

On décrit des molécules d'acide nucléique isolées codant de nouveaux membres de la famille de polypeptides IRT qui comprend, dans une application préférée, au moins un domaine transmembranaire ayant une homologie de séquence d'acides aminés d'au moins environ 30 %, et préférablement, d'au moins environ 45 %, 60 % ou 70 %, avec la SEQ ID NO: 2 et/ou au moins un domaine riche en histidine. Les polypeptides IRT1 de l'invention sont capables de transporter des métaux tels le Fe(II), le Cd, le Co, le Mn, le Pb, le Hg et le Zn. On décrit également des plantes transgéniques dans lesquelles l'expression d'un polypeptide IRT de l'invention est modifiée. Ces plantes transgéniques peuvent être utilisées pour éliminer des polluants du sol ou comme suppléments nutritionnels pour traiter la carence en fer. Des molécules d'acide nucléique antisens, des vecteurs d'expression recombinants contenant les molécules d'acide nucléique de l'invention et des cellules hôtes dans lesquelles les vecteurs d'expression ont été introduits sont également décrits. L'invention fournit également des polypeptides IRT isolés, des polypeptides de fusion et des fragments actifs de ces derniers. Des méthodes thérapeutiques faisant appel aux compositions de l'invention sont également fournies.

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