Starch branching enzymes contributing to amylose and amylopectin fine structure in wheat

Haiteng Li; Wenwen Yu; Sushil Dhital; Michael J. Gidley; Robert G. Gilbert

doi:10.1016/j.carbpol.2019.115185

Starch branching enzymes contributing to amylose and amylopectin fine structure in wheat

Haiteng Li, Wenwen Yu, Sushil Dhital, Michael J. Gidley, Robert G. Gilbert

Chemical & Biological Engineering

Research output: Contribution to journal › Article › Research › peer-review

49 Citations (Scopus)

Abstract

Starch branching enzymes (SBEs) play a major role in determining starch molecular structure in cereal endosperm. This study investigates how SBEIIs contribute to the chain-length distributions (CLDs) of both amylopectin and amylose, obtained by enzymatic debranching of native starch. Wheat starches with low (37%) to high (93%) amylose content were obtained through altering SBEII in planta. Multiple components were detected in both amylose and amylopectin CLDs. Model fitting of these CLDs reveals a quantitative association between the enzyme activities in amylopectin and amylose. SBEIIa modifies shorter branches (degree of polymerization DP ≲ 12) in amylopectin and longer amylose chains with a CLD peak at ˜3000 DP. SBEIIb acts on longer branches (DP≲ 32) in amylopectin, while its effect on amylose fine structure is not significant. Using both the amylose and amylopectin models to analyze the CLD reveals connections between amylose and amylopectin in wheat starch biosynthesis.

Original language	English
Article number	115185
Number of pages	8
Journal	Carbohydrate Polymers
Volume	224
DOIs	https://doi.org/10.1016/j.carbpol.2019.115185
Publication status	Published - 15 Nov 2019

Keywords

Branching enzyme
Chain-length distribution
High amylose starch
Starch structure
Wheat

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title = "Starch branching enzymes contributing to amylose and amylopectin fine structure in wheat",

abstract = "Starch branching enzymes (SBEs) play a major role in determining starch molecular structure in cereal endosperm. This study investigates how SBEIIs contribute to the chain-length distributions (CLDs) of both amylopectin and amylose, obtained by enzymatic debranching of native starch. Wheat starches with low (37%) to high (93%) amylose content were obtained through altering SBEII in planta. Multiple components were detected in both amylose and amylopectin CLDs. Model fitting of these CLDs reveals a quantitative association between the enzyme activities in amylopectin and amylose. SBEIIa modifies shorter branches (degree of polymerization DP ≲ 12) in amylopectin and longer amylose chains with a CLD peak at ˜3000 DP. SBEIIb acts on longer branches (DP≲ 32) in amylopectin, while its effect on amylose fine structure is not significant. Using both the amylose and amylopectin models to analyze the CLD reveals connections between amylose and amylopectin in wheat starch biosynthesis.",

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year = "2019",

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doi = "10.1016/j.carbpol.2019.115185",

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AU - Li, Haiteng

AU - Yu, Wenwen

AU - Dhital, Sushil

AU - Gidley, Michael J.

AU - Gilbert, Robert G.

PY - 2019/11/15

Y1 - 2019/11/15

N2 - Starch branching enzymes (SBEs) play a major role in determining starch molecular structure in cereal endosperm. This study investigates how SBEIIs contribute to the chain-length distributions (CLDs) of both amylopectin and amylose, obtained by enzymatic debranching of native starch. Wheat starches with low (37%) to high (93%) amylose content were obtained through altering SBEII in planta. Multiple components were detected in both amylose and amylopectin CLDs. Model fitting of these CLDs reveals a quantitative association between the enzyme activities in amylopectin and amylose. SBEIIa modifies shorter branches (degree of polymerization DP ≲ 12) in amylopectin and longer amylose chains with a CLD peak at ˜3000 DP. SBEIIb acts on longer branches (DP≲ 32) in amylopectin, while its effect on amylose fine structure is not significant. Using both the amylose and amylopectin models to analyze the CLD reveals connections between amylose and amylopectin in wheat starch biosynthesis.

AB - Starch branching enzymes (SBEs) play a major role in determining starch molecular structure in cereal endosperm. This study investigates how SBEIIs contribute to the chain-length distributions (CLDs) of both amylopectin and amylose, obtained by enzymatic debranching of native starch. Wheat starches with low (37%) to high (93%) amylose content were obtained through altering SBEII in planta. Multiple components were detected in both amylose and amylopectin CLDs. Model fitting of these CLDs reveals a quantitative association between the enzyme activities in amylopectin and amylose. SBEIIa modifies shorter branches (degree of polymerization DP ≲ 12) in amylopectin and longer amylose chains with a CLD peak at ˜3000 DP. SBEIIb acts on longer branches (DP≲ 32) in amylopectin, while its effect on amylose fine structure is not significant. Using both the amylose and amylopectin models to analyze the CLD reveals connections between amylose and amylopectin in wheat starch biosynthesis.

KW - Branching enzyme

KW - Chain-length distribution

KW - High amylose starch

KW - Starch structure

KW - Wheat

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Starch branching enzymes contributing to amylose and amylopectin fine structure in wheat

Abstract

Keywords

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