Expression profiling of genes involved in starch synthesis in sink and source organs of rice.
- Takashi Ohdan, P. Francisco, Yasunori Nakamura
- Medicine, BiologyJournal of Experimental Botany
- 1 December 2005
Using quantitative real-time RT-PCR, an examination was made of the expression profiles of 27 rice genes encoding six classes of enzymes, i.e. ADPglucose pyrophosphorylase (AGPase), starch synthase, starch branching enzyme, starch debranching enzymes, starch phosphorylases, and disproportionating enzyme in developing seeds and leaves.
Towards a better understanding of the metabolic system for amylopectin biosynthesis in plants: rice endosperm as a model tissue.
- Yasunori Nakamura
- Biology, MedicinePlant and Cell Physiology
- 15 July 2002
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.
Starch biosynthesis in cereal endosperm.
- J. Jeon, Nayeon Ryoo, T. Hahn, H. Walia, Yasunori Nakamura
- Chemistry, MedicinePlant physiology and biochemistry : PPB
- 1 June 2010
Characterization of SSIIIa-Deficient Mutants of Rice: The Function of SSIIIa and Pleiotropic Effects by SSIIIa Deficiency in the Rice Endosperm[C][OA]
- N. Fujita, Mayumi Yoshida, Yasunori Nakamura
- Biology, MedicinePlant Physiology
- 22 June 2007
Starch synthase IIIa (SSIIIa)-deficient rice (Oryza sativa) mutants were generated using retrotransposon insertion and chemical mutagenesis. The lowest migrating SS activity bands on…
Essential amino acids of starch synthase IIa differentiate amylopectin structure and starch quality between japonica and indica rice varieties
- Yasunori Nakamura, P. Francisco, N. Fujita
- Biology, MedicinePlant Molecular Biology
- 1 May 2005
The present study confirmed that the SSIIa activity determines the type of amylopectin structure of rice starch to be either the typical indica-type or japonica-type, by playing a specific role in the synthesis of the long B1 chains by elongating short A and B2 chains, notwithstanding the presence of functional SSII genes.
Effect of Powdered Fermented Milk with Lactobacillus helveticus on Subjects with High-Normal Blood Pressure or Mild Hypertension
- Kotaro Aihara, O. Kajimoto, H. Hirata, R. Takahashi, Yasunori Nakamura
- MedicineJournal of the American College of Nutrition
- 1 August 2005
Daily ingestion of the tablets containing powdered fermented milk with L. helveticus CM4 in subjects with high-normal blood pressure or mild hypertension reduces elevated blood pressure without any adverse effects.
Carbohydrate Metabolism in the Developing Endosperm of Rice Grains
- Yasunori Nakamura, Kazuhiro Yuki, Shin‐Young Park, T. Ohya
- Biology
- 1 September 1989
Etude du metabolisme des hydrates de carbone dans l'albumen de grains de riz (Oryza sativa) en developpement par comparaison des taux d'activite de 33 enzymes majeures entre l'albumen et les feuilles…
Function and Characterization of Starch Synthase I Using Mutants in Rice
- N. Fujita, Mayumi Yoshida, Yasunori Nakamura
- Medicine, BiologyPlant Physiology
- 27 January 2006
It is strongly suggested that amylopectin chains are synthesized by the coordinated actions of SSI, SSIIa, and SSIIIa isoforms.
Mutation of the Plastidial α-Glucan Phosphorylase Gene in Rice Affects the Synthesis and Structure of Starch in the Endosperm[W]
- H. Satoh, Kensuke Shibahara, Yasunori Nakamura
- Medicine, BiologyThe Plant Cell Online
- 1 July 2008
It is suggested thatPho1 plays a crucial role in starch biosynthesis in rice endosperm at low temperatures and that one or more other factors can complement the function of Pho1 at high temperatures.
Natural variation in rice starch synthase IIa affects enzyme and starch properties.
- T. Umemoto, N. Aoki, S. Maruyama
- Biology, MedicineFunctional Plant Biology
- 1 August 2004
It is reported that the alkali-susceptible cultivar Nipponbare lacked SSIIa activity in endosperm, however, the activity was detected with NILs having the alk allele of alkalo-tolerant Kasalath and the results obtained explain the potential importance of two of the amino acid residues for starch association of riceSSIIa.
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