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JCS ePress
online publication date 31 Aug 2004
doi: 10.1242/jcs.01360
Research Article
Arabidopsis VARIEGATED 3 encodes a chloroplast-targeted, zinc-finger protein required for chloroplast and palisade cell development
Henrik Næsted,
Agnethe Holm,
Tom Jenkins,
H. Bjørn Nielsen,
Cassandra A. Harris,
Michael H. Beale,
Mathias Andersen,
Alexandra Mant,
Henrik Scheller,
Bilal Camara,
Ole Mattsson,
and
John Mundy*
* Author for correspondence (e-mail: mundy{at}biobase.dk)
The stable, recessive Arabidopsis variegated 3 (var3) mutant exhibits a variegated phenotype due to somatic areas lacking or containing developmentally retarded chloroplasts and greatly reduced numbers of palisade cells. The VAR3 gene, isolated by transposon tagging, encodes the 85.9 kDa VAR3 protein containing novel repeats and zinc fingers described as protein interaction domains. VAR3 interacts specifically in yeast and in vitro with NCED4, a putative polyene chain or carotenoid dioxygenase, and both VAR3 and NCED4 accumulate in the chloroplast stroma. Metabolic profiling demonstrates that pigment profiles are qualitatively similar in wild type and var3, although var3 accumulates lower levels of chlorophylls and carotenoids. These results indicate that VAR3 is a part of a protein complex required for normal chloroplast and palisade cell development.

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© The Company of Biologists Ltd 2004