On the cluster structure of amylopectin.

  title={On the cluster structure of amylopectin.},
  author={Yasunori Nakamura and Keiji Kainuma},
  journal={Plant molecular biology},
KEY MESSAGE Two opposing models for the amylopectin structure are historically and comprehensively reviewed, which leads us to a better understanding of the specific fine structure of amylopectin. Amylopectin is a highly branched glucan which accounts for approximately 65-85 of starch in most plant tissues. However, its fine structure is still not fully understood due to the limitations of current methodologies. Since the 1940 s, many scientists have attempted to elucidate the distinct… 

Changes in fine structure of amylopectin and internal structures of starch granules in developing endosperms and culms caused by starch branching enzyme mutations of japonica rice

Key message BEIIb plays a specific role in determining the structure of amylopectin in rice endosperm, whereas BEIIa plays the similar role in the culm where BEIIb is absent. Abstract Cereals have

Effects of Various Allelic Combinations of Starch Biosynthetic Genes on the Properties of Endosperm Starch in Rice

Rice endosperm accumulates large amounts of photosynthetic products as insoluble starch within amyloplasts by properly arranging structured, highly branched, large amylopectin molecules, thus

The Variation of Rice Quality and Relevant Starch Structure during Long-Term Storage

The main substances of rice are starches, which vary their metabolism during storage. We conducted a series of tests including rice physicochemical properties, edible quality, starch content and

Improving Agricultural Traits While Maintaining High Resistant Starch Content in Rice

Background Resistant starch (RS) is beneficial for human health. Loss of starch branching enzyme IIb (BEIIb) increases the proportion of amylopectin long chains, which greatly elevates the RS

Cluster Size of Amylopectin and Nanosized Amylopectin Fragments Characterized by Pyrene Excimer Formation

Amylopectin from waxy corn and the three nanosized amylopectin fragments (NAFs)—NAF(56), NAF(20), and NAF(8)—from waxy corn starch with a hydrodynamic diameter of 227, 56, 20, and 8 nm, respectively,



On the Building Block and Backbone Concepts of Amylopectin Structure

ABSTRACT The molecular structure of the starch components has been a focus of research since it was discovered that starch is transformed into sugar by treatment with acid or barley malt extract in

Understanding Starch Structure: Recent Progress

In this review two models of the amylopectin structure are described, namely the “cluster model” and the ‘building block backbone model’, and the structure of the starch granules is discussed in light of both.

The molecular structures of starch components and their contribution to the architecture of starch granules: A comprehensive review

Recent developments in methods and instrumentation have contributed to major advances in our understanding of the fine structure of amylose and amylopectin. The structure of the starch granule slowly

Towards a better understanding of the metabolic system for amylopectin biosynthesis in plants: rice endosperm as a model tissue.

A new model referred to as the "two-step branching and improper branch clearing model" is proposed to explain how amylopectin is synthesized, which emphasizes that two sets of reactions, alpha-1,6-branch formation and the subsequent alpha- 1,4-chain elongation, are fundamental to the construction of the cluster structure.

Structure of building blocks in amylopectins.

Building block organisation of clusters in amylopectin from different structural types.

Effects of BEIIb-Deficiency on the Cluster Structure of Amylopectin and the Internal Structure of Starch Granules in Endosperm and Culm of Japonica-Type Rice

A model for the cluster structure of amylopectin in WT and ae mutant of rice endosperm is proposed and the results strongly suggest that BEIIb specifically formed new short chains whose branch points were localized in the basal part of the crystalline lamellae and presumably in the intermediate between the crystallines and amorphous lamellai of amyopectIn clusters in the WTendosperm.

Starch granules: structure and biosynthesis.

A Review of Starch Biosynthesis in Relation to the Building Block-Backbone Model

This review outlines current knowledge of granule architecture and the starch biosynthesis pathway in relation to the building block-backbone model of starch structure, and argues that the model takes accurate account of both structural and biochemical data.