1998
DOI: 10.1104/pp.117.2.425
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Characterization of SU1 Isoamylase, a Determinant of Storage Starch Structure in Maize1

Abstract: Function of the maize (Zea mays) gene sugary1 (su1) is required for normal starch biosynthesis in endosperm. Homozygous su1-mutant endosperms accumulate a highly branched polysaccharide, phytoglycogen, at the expense of the normal branched component of starch, amylopectin. These data suggest that both branched polysaccharides share a common precursor, and that the product of the su1 gene, designated SU1, participates in kernel starch biosynthesis. SU1 is similar in sequence to ␣-(136) glucan hydrolases (starch… Show more

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Cited by 102 publications
(102 citation statements)
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“…Activity in developing grain was detected at levels similar to those found initially in the germinated grain, and the results confirm earlier immunological studies suggesting that limit dextrinase protein is present in developing barley kernels (Sissons et al, 1993). The presence of low levels of limit dextrinase mRNA and enzyme activity in developing endosperm at times that coincide with the deposition of starch is consistent with the proposed role for the enzyme in amylopectin synthesis in cereals (Rahman et al, 1998), although it must be emphasized that the endosperm tissue used here did include some associated aleurone cells.…”
Section: Discussionsupporting
confidence: 88%
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“…Activity in developing grain was detected at levels similar to those found initially in the germinated grain, and the results confirm earlier immunological studies suggesting that limit dextrinase protein is present in developing barley kernels (Sissons et al, 1993). The presence of low levels of limit dextrinase mRNA and enzyme activity in developing endosperm at times that coincide with the deposition of starch is consistent with the proposed role for the enzyme in amylopectin synthesis in cereals (Rahman et al, 1998), although it must be emphasized that the endosperm tissue used here did include some associated aleurone cells.…”
Section: Discussionsupporting
confidence: 88%
“…developing grain. This could involve the processing of preamylopectin Mouille et al, 1996;Nakamura et al, 1996;Rahman et al, 1998) or the provision of oligomeric primers for starch synthases (Duffus and Cochrane, 1993). Any role in starch synthesis would presumably be performed in amyloplasts of the developing grain, but could also occur in chloroplasts of leaves and other photosynthetic tissues.…”
Section: Discussionmentioning
confidence: 99%
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“…Different levels of ISA activity, such as in maize (su1), barley (isa-1), and rice (sug-1), can result in a range of phenotypes associated with the endosperm, ranging from a mild phenotype of sugary amylopectin with more short chains, to a severe phenotype resulting in the replacement of amylopectin with phytoglycogen [91][92][93][94][95][96]. Rice, maize and barley sugary-1 (ISA1) mutants have shown heterogeneous distributions of starch and phytoglycogen in their endosperms, while Arabidopsis mutants of ISA1 and ISA2 display accumulation of phytoglycogen in the leach mesophyll and slightly altered amylopectin in the epidermal cells and vascular bundle-sheath cells [97.98].…”
Section: Starch Debranching Enzymes (Dbes)mentioning
confidence: 99%