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Plant and Cell Physiology Advance Access published online on November 7, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm153
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

The major route for chlorophyll synthesis includes [3,8-divinyl]-chlorophyllide a reduction in Arabidopsis thaliana

Nozomi Nagata1,2,4, Ryouichi Tanaka1,3 and Ayumi Tanaka1,3

1: Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
2: Japan Society for the Promotion of Science (JSPS), Tokyo 102-8472, Japan
3: Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan

Corresponding Author: Dr. Nozomi Nagata, Institute of Low Temperature Science, Hokkaido University, Kita-ku Kita-19 Nishi-8, Sapporo, 060-0819 Japan, E-mail: nagata{at}lowtem.hokudai.ac.jp, Tel/Fax: +81-11-706-5493


  Abstract

In most reviews on chlorophyll biosynthesis, chlorophyll is described to be synthesized via the route involving the reduction of [3,8-divinyl]-protochlorophyllide a. However, the possibility remains open that the conversion of the divinyl form of the chlorophyll intermediates to its monovinyl form takes place at other enzymatic steps. To determine the actual route for chlorophyll biosynthesis, we examined the substrate specificity of the formerly named [3,8-divinyl]-protochlorophyllide a 8-vinyl reductase (DVR) in vitro. In addition, we investigated the accumulation of various chlorophyll intermediates in etiolated seedlings in vivo. Collectively, these studies indicate that [3,8-divinyl]-chlorophyllide a is the major substrate of DVR.

Keywords: Arabidopsis thaliana - chlorophyll biosynthetic pathway - [3,8-divinyl]-protochlorophyllide a - [3,8-divinyl]-chlorophyllide a 8-vinyl reductase

4Present address: Laboratory of Molecular and Celluler Biology of Totipotency, Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, 606 8502 Japan

(Received October 3, 2007; Accepted November 5, 2007)
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