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Plant and Cell Physiology Advance Access originally published online on February 2, 2005
Plant and Cell Physiology 2005 46(4):661-665; doi:10.1093/pcp/pci062
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JSPP © 2005

Short Communication

The Tomato Photomorphogenetic Mutant, aurea, is Deficient in Phytochromobilin Synthase for Phytochrome Chromophore Biosynthesis

Takuya Muramoto1, Chitose Kami2, Hideo Kataoka3, Naoko Iwata2, Philip J. Linley1, Keiko Mukougawa1,2, Akiho Yokota2 and Takayuki Kohchi1,4

1 Graduate School of Biostudies, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto, 606-8502 Japan
2 Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192 Japan
3 Department of Applied Life Sciences, Faculty of Agriculture, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto, 606-8502 Japan

4 Corresponding author: E-mail, tkohchi{at}lif.kyoto-u.ac.jp; Fax, +81-75-753-6127.

The aurea mutants of tomato have been widely used as phytochrome-deficient mutants for photomorphogenetic and photobiological studies. By expressed sequence tag (EST)-based screening of sequence databases, we found a tomato gene that encodes a protein homologous to Arabidopsis HY2 for phytochromobilin synthase catalyzing the last step of phytochrome chromophore biosynthesis. The tomato protein expressed in Escherichia coli showed phytochromobilin synthase activity. The corresponding loci in all aurea mutants tested have nucleotide substitutions, deletions or DNA rearrangements. These results indicate that aurea is a mutant of phytochromobilin synthase in tomato. We also discuss a phylogenetic analysis of phytochromobilin synthases in the bilin reductase family.

The nucleotide sequences reported in this paper has been submitted to DDBJ under accession numbers AB194774 (AU cDNA) and AB194775 (AU genomic DNA).

Received November 12, 2004; Accepted January 21, 2005
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