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

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2002 Mar 23

PMID 11910009

Citations 51

Authors

Takayuki Asano

Noriko Kunieda

Yuhi Omura

Hirokazu Ibe

Tsutomu Kawasaki

Makoto Takano

Miho Sato

Hideyuki Furuhashi

Toshiyuki Mujin

Fumio Takaiwa

Yuichi Tada

Tomomi Satozawa

Masahiro Sakamoto

Hiroaki Shimada

Affiliations

Soon will be listed here.

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.

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