NDLI: Rice SPK, a calmodulin-like domain protein kinase, is required for storage product accumulation during seed development: phosphorylation of sucrose synthase is a possible factor.

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Rice SPK, a calmodulin-like domain protein kinase, is required for storage product accumulation during seed development: phosphorylation of sucrose synthase is a possible factor.

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Year: 2002 Volume: 14 Issue: 2

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Year: 2002 Volume: 14 Issue: Supplementary

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Rice SPK, a calmodulin-like domain protein kinase, is required for storage product accumulation during seed development: phosphorylation of sucrose synthase is a possible factor.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Asano, Takayuki Kunieda, Noriko Omura, Yuhi Ibe, Hirokazu Kawasaki, Tsutomu Takano, Makoto Sato, Miho Furuhashi, Hideyuki Mujin, Toshiyuki Takaiwa, Fumio Wu Cy, Chuan-yin Tada, Yuichi Satozawa, Tomomi Sakamoto, Masahiro Shimada, Hiroaki
Description	Country affiliation: Japan Author Affiliation: Asano T ( Department of Biological Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda 278-8510, Japan.)
Abstract	Suc, an end product of photosynthesis, is metabolized by Suc synthase in sink organs as an initial step in the biosynthesis of storage products. Suc synthase activity is known to be regulated by reversible phosphorylation, but the details of this process are unclear at present. Rice SPK, a calcium-dependent protein kinase, is expressed uniquely in the endosperm of immature seed, and its involvement in the biosynthetic pathways of storage products was suggested. Antisense SPK transformants lacked the ability to accumulate storage products such as starch, but produced watery seed with a large amount of Suc instead, as the result of an inhibition of Suc degradation. Analysis of in vitro phosphorylation indicated that SPK phosphorylated specifically a Ser residue in Suc synthase that has been shown to be important for its activity in the degradation of Suc. This finding suggests that SPK is involved in the activation of Suc synthase. It appears that SPK is a Suc synthase kinase that may be important for supplying substrates for the biosynthesis of storage products.
File Format	HTM / HTML
ISSN	10404651
e-ISSN	1531298X
Journal	THE PLANT CELL ONLINE
Issue Number	3
Volume Number	14
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2002-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Botany Oryza Sativa Enzymology Protein Kinases Genetics Protein-serine-threonine Kinases Metabolism Amino Acid Sequence Fructose Biosynthesis Gene Expression Regulation, Enzymologic Glucose Isoenzymes Molecular Sequence Data Growth & Development Phosphorylation Photosynthesis Plant Proteins Plants, Genetically Modified Sequence Homology, Amino Acid Serine Starch Sucrose Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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Rice SPK, a calmodulin-like domain protein kinase, is required for storage product accumulation during seed development: phosphorylation of sucrose synthase is a possible factor.

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