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Plant and Cell Physiology Advance Access originally published online on May 3, 2005
Plant and Cell Physiology 2005 46(7):1165-1172; doi:10.1093/pcp/pci119
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JSPP © 2005

Short Communication

ALBINO AND PALE GREEN 10 Encodes BBMII Isomerase Involved in Histidine Biosynthesis in Arabidopsis thaliana

Yoshiteru Noutoshi1,3, Takuya Ito1 and Kazuo Shinozaki1,2,*

1 Laboratory of Plant Molecular Biology, RIKEN Tsukuba Institute, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074 Japan
2 Plant Functional Genomics Group, RIKEN Genomic Sciences Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan

* Corresponding author: E-mail: sinozaki{at}rtc.riken.jp; Fax, +81-29-836-9060.

We isolated an Arabidopsis albino and pale green 10 (apg10) mutant which exhibits pale green cotyledons and true leaves at the juvenile stage. We identified a valine to leucine change in BBMII (N'-[(5'-phosphoribosyl)-formimino]-5-aminoimidazole-4-carboxamide ribonucleotide) isomerase involved in histidine biosynthesis. The morphological abnormality of apg10 was recovered by histidine supplementation. The histidine limitation induced by apg10 mutation causes dynamic changes of the free amino acid profile, suggesting the existence of a cross-pathway regulatory mechanism of amino acid biosynthesis in plants. We also revealed that the APG10 knockout mutant exhibited embryo lethality, indicating the essential role of the Arabidopsis BBMII isomerase for plant growth.

3 Present address: The Sainsbury Laboratory, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.

The nucleotide sequence reported in this paper has been submitted to GenBank under the accession number AB195273.

(Received December 13, 2004; Accepted April 26, 2005)
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