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PMID:18398054

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Citation

Magnani, E and Hake, S (2008) KNOX lost the OX: the Arabidopsis KNATM gene defines a novel class of KNOX transcriptional regulators missing the homeodomain. Plant Cell 20:875-87

Abstract

Three amino acid loop extension (TALE) homeodomain transcriptional regulators play a central role in plant and animal developmental programs. Plant KNOTTED1-like homeobox (KNOX) and animal Myeloid ecotropic viral integration site (MEIS) proteins share a TALE homeodomain and a MEINOX (MEIS-KNOX) domain, suggesting that an ancestral MEINOX-TALE protein predates the divergence of plants from fungi and animals. In this study, we identify and characterize the Arabidopsis thaliana KNATM gene, which encodes a MEINOX domain but not a homeodomain. Phylogenetic analysis of the KNOX family places KNATM in a new class and shows conservation in dicotyledons. We demonstrate that KNATM selectively interacts with Arabidopsis BELL TALE proteins through the MEINOX domain. The homeodomain is known to be necessary for KNOX-KNOX interaction. On the contrary, KNATM specifically dimerizes with the KNOX protein BREVIPEDICELLUS through an acidic coiled-coil domain. KNATM is expressed in proximal-lateral domains of organ primordia and at the boundary of mature organs; in accordance, genetic analyses identify a function for KNATM in leaf proximal-distal patterning. In vivo domain analyses highlighted KNATM functional regions and revealed a role as transcriptional regulator. Taken together, our data reveal a homeodomain-independent mechanism of KNOX dimerization and transcriptional regulation.

Links

PubMed PMC2390742 Online version:10.1105/tpc.108.058495

Keywords

Amino Acid Sequence; Arabidopsis/genetics; Arabidopsis Proteins/chemistry; Arabidopsis Proteins/genetics; Genes, Plant; Homeodomain Proteins/chemistry; Homeodomain Proteins/genetics; Molecular Sequence Data; Phylogeny; Sequence Homology, Amino Acid; Subcellular Fractions/metabolism; Transcription, Genetic; Two-Hybrid System Techniques

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:KNATM

located_in

GO:0005634: nucleus

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:KNATM

located_in

GO:0005737: cytoplasm

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:KNATM

acts_upstream_of_or_within

GO:0010589: leaf proximal/distal pattern formation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:KNATM

acts_upstream_of_or_within

GO:0045893: positive regulation of transcription, DNA-templated

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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