Dull1 coding for a starch synthase and uses thereof

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/52 (2006.01) A01H 4/00 (2006.01) A01H 5/00 (2006.01) B01J 4/02 (2006.01) C07H 21/04 (2006.01) C12N 5/04 (2006.01) C12N 9/10 (2006.01) C12N 15/29 (2006.01) C12N 15/82 (2006.01) C12N 15/84 (2006.01)

Patent

CA 2309346

The maize gene dull1 (du1) of the present invention is a determinant of the structure of endosperm starch. Mutations of du1 affect the activity of at least two enzymes involved in starch biosynthesis, namely the starch synthase, SSII, and the starch branching enzyme, SBEIIa. Du1 codes for a predicted 1674 residue protein, and is expressed with a unique temporal pattern in endosperm but is undetectable in leaf or root. The size of the Du1 product and its expression pattern match precisely the known characteristics of maize SSII. The Du1 product contains two different repeated regions in its unique amino terminus, one of which is identical to a conserved segment of the starch debranching enzymes. The cDNA provided for in the present invention encodes SSII, and mutations within this gene affect multiple aspects of starch biogenesis by disrupting an enzyme complex containing starch synthase(s), starch branching enzyme(s), and possibly starch debranching enzyme(s).

Le gène dull1 (du1) du maïs de la présente invention est un déterminant de la structure de l'amidon de l'endosperme. Des mutations de du1 affectent l'activité d'au moins deux enzymes impliqués dans la biosynthèse de l'amidon, c'est-à-dire la synthase de l'amidon, SSII, et l'enzyme de ramification de l'amidon, SBEIIa. Du1 code pour une protéine prédite de 1674 restes, et il est exprimé avec un motif temporel unique dans l'endosperme mais il est indétectable dans le feuilles ou les racines. La taille du produit Du1 et son motif d'expression correspondent avec précision aux caractéristiques connues du maïs SSII. Le produit Du1 contient deux régions répétées différentes dans sa terminaison amino unique, dont une est identique à un segment conservé des enzymes de déramification de l'amidon. L'ADNc prévu dans la présente invention code le SSII et des mutations à l'intérieur de ce gène affectent de multiples aspects de la biogenèse de l'amidon par interruption du complexe enzymatique contenant la ou les synthases de l'amidon, la ou les enzymes de ramification de l'amidon, et éventuellement la ou les enzymes de déramification de l'amidon.

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