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Starch granule biosynthesis in Arabidopsis is abolished by removal of all debranching enzymes but restored by the subsequent removal of an endoamylase

Streb, Sebastian ; Delatte, Thierry ; Umhang, Martin ; Eicke, Simona ; Schorderet, Martine ; Reinhardt, Didier ; Zeeman, Samuel C.

In: The Plant Cell, 2009, vol. 20, p. 3448-3466

Several studies have suggested that debranching enzymes (DBEs) are involved in the biosynthesis of amylopectin, the major constituent of starch granules. Our systematic analysis of all DBE mutants of Arabidopsis thaliana demonstrates that when any DBE activity remains, starch granules are still synthesized, albeit with altered amylopectin structure. Quadruple mutants lacking all four DBE proteins...