Plant Molecular Biology

, Volume 42, Issue 4, pp 603–613

In Arabidopsis thaliana, 1% of the genome codes for a novel protein family unique to plants

Authors

  • Sébastien Aubourg
    • Institut de Biotechnologie des Plantes, UMR CNRS 8618, Laboratoire de Biologie du Développement des PlantesUniversité de Paris-Sud
  • Nathalie Boudet
    • Institut de Biotechnologie des Plantes, UMR CNRS 8618, Laboratoire de Biologie du Développement des PlantesUniversité de Paris-Sud
  • Martin Kreis
    • Institut de Biotechnologie des Plantes, UMR CNRS 8618, Laboratoire de Biologie du Développement des PlantesUniversité de Paris-Sud
  • Alain Lecharny
    • Institut de Biotechnologie des Plantes, UMR CNRS 8618, Laboratoire de Biologie du Développement des PlantesUniversité de Paris-Sud
Article

DOI: 10.1023/A:1006352315928

Cite this article as:
Aubourg, S., Boudet, N., Kreis, M. et al. Plant Mol Biol (2000) 42: 603. doi:10.1023/A:1006352315928

Abstract

In the sequences released by the Arabidopsis Genome Initiative (AGI), we discovered a new and unexpectedly large family of orphan genes (127 genes by 01.08.99), named AtPCMP. The distribution of the AtPCMP genes on the five chromosomes suggests that the genome of Arabidopsis thaliana contains more than 200 genes of this family (1% of the whole genome). The deduced AtPCMP proteins are characterized by a surprising combinatorial organization of sequence motifs. The amino-terminal domain is made of a succession of three conserved motifs which generate an important diversity. These proteins are classified into three subfamilies based on the length and nature of their carboxy-terminal domain constituted by 1–6 motifs. All the motifs characterized have an important level of conservation in both sequence and spacing. A specific signature of this large family is defined. The presence of ESTs in databases and the detection of clones in A. thaliana cDNA libraries indicate that most of the genes of this family are expressed. The absence of similar sequences outside the plant kingdom strongly suggests that this unusually large orphan family is unique to plants. Features, the genesis, the potential function and the evolution of this plant combinatorial and modular protein family are discussed.

gene familycombinatorial motifsorphan genesArabidopsisgenome
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© Kluwer Academic Publishers 2000