Molecular Biology Reports

, Volume 35, Issue 4, pp 567–573 | Cite as

A novel Otubain-like cysteine protease gene is preferentially expressed during somatic embryogenesis in Pinus radiata

  • Felipe Aquea
  • Florencia Gutiérrez
  • Consuelo Medina
  • Patricio Arce-Johnson


OTUBAINS are a recently discovered family of cysteine proteases that participate in the ubiquitin pathway. These proteins were originally described in animal systems and are involved in removing the ubiquitin chain attached to a protein destined for degradation. In a cDNA-AFLP screen designed to identify genes that are expressed during early somatic embryogenesis in the conifer Pinus radiata, a fragment-derived transcript corresponding to an Otubain-like cysteine protease was identified. The full-length cDNA contained an 885 bp ORF encoding 294 amino acids, and was named PrOTUBAIN. The deduced protein showed high identity to other OTUBAINS and contained an OTU domain and a catalytic triad characteristic of cysteine proteases. The 3-D model of PrOTUBAIN showed significant similarity to human OTUBAIN2, suggesting that the plant protein may possess functions similar to that of the human protein. Real time PCR assays demonstrated that PrOTUBAIN is expressed in different tissues and that transcript are particularly abundant in embryogenic tissues. This is the first report of this class of protein in higher plants and the putative role of PrOTUBAIN is discussed.


Deubiquitinase OTUBAIN Pinus radiata Somatic embryogenesis  Ubiquitin pathway 



DNA complementary to RNA-amplified fragment length polymorphism




Ovarian tumor


Somatic embryogenesis


Transcript-derived fragment



Felipe Aquea was supported by a PhD fellowship from CONICYT, Chilean National Council of Science and Technology and VRAID, Pontificia Universidad Católica de Chile.


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Felipe Aquea
    • 1
  • Florencia Gutiérrez
    • 1
  • Consuelo Medina
    • 1
  • Patricio Arce-Johnson
    • 1
  1. 1.Departamento de Genética Molecular y Microbiología, Facultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile

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