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MBE Advance Access published online on June 23, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh197
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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Accepted June 1, 2004

Original Articles

Comparative Analysis of Plant and Animal Calcium Signal Transduction Element Using Plant Full-Length cDNA Data

Toshifumi Nagata 1, Shigemi Iizumi 1, Kouji Sato 1, Hisako Ooka 1, Jun Kawai 2, Piero Carninci 2, Yasuhide Hayashizaki 2, Yasuhiro Ohtomo 3, Kazuo Murakami 3, Kenichi Matsubara 3, Shoshi Kikuchi 4*

1 National Institute of Agrobiological Sciences, 2-1-2 Kannon-dai, Tsukuba, Ibaraki 305-08602, Japan
2 RIKEN Institute, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
3 Foundation for Advancement of International Science, 586-9, Akatsuka-Ushigahuchi, Tsukuba, Ibaraki 305-0062, Japan
4 Department of Molecular Genetics, National Institute of Agrobiological Sciences, Kannondai 2-1-2 Kannon-dai, Tsukuba, Ibaraki 305-08602, Japan

* To whom correspondence should be addressed. E-mail: skikuchi{at}nias.affrc.go.jp.


  Abstract

We obtained 32K full-length cDNA sequence data from the rice full-length cDNA project and performed a homology search against NCBI GenBank data. We have also searched homologs of Arabidopsis and other plant's genes with the databases. Comparative analysis of calcium ion transport proteins revealed that the genes specific for muscle and nerve calcium signal transduction systems (VDCC, IP3 receptor, ryanodine receptor) are very different in animals and plants. In contrast, Ca elements with basic functions in cell responses (CNGC, iGlu receptor, Ca2+ATPase, Ca2+/Na+ -K+ ion-exchanger) are basically conserved between plants and animals. We also performed comparative analyses of calcium ion binding and/or controlling signal transduction proteins. Many genes specific for muscle and nerve tissue do not exist in plants. However, calcium ion signal transduction genes of basic functions of cell homeostasis and responses were well conserved, plants have developed a calcium ion interacting system that is more direct than in animals. Many species of plants have specifically modified calcium ion binding proteins (CPK, CRK), Ca2+/phospholipid binding domains, and calcium storage proteins.

Keywords: calcium transport protein; calcium binding protein; full-length cDNA.
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