The COP9 signalosome interacts with SCFUFO and participates in Arabidopsis flower development

XP Wang, SH Feng, N Nakayama, WL Crosby, D N Irish, XW Deng, N Wei*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The COP9 signalosome (CSN) is involved in multiple developmental processes. It interacts with SCF ubiquitin ligases and deconjugates Nedd8/Rub1 from cullins (deneddylation). CSN is highly expressed in Arabidopsis floral tissues. To investigate the role of CSN in flower development, we examined the expression pattern of CSN in developing flowers. We report here that two csn1 partially deficient Arabidopsis strains exhibit aberrant development of floral organs, decline of APETALA3 (AP3) expression, and low fertility in addition to defects in shoot and inflorescence meristems. We show that UNUSUAL FLORAL ORGANS (UFO) forms a SCFUFO Complex, which is associated with CSN in vivo. Genetic interaction analysis indicates that CSN is necessary for the gain-of-function activity of the F-box protein UFO in AP3 activation and in floral organ transformation. Compared with the previously reported csn5 antisense and csn1 null mutants, partial deficiency of CSN1 causes a reduction in the level of CUL1 in the mutant flowers without an obvious defect in CUL1 deneddylation. We conclude that CSN is an essential regulator of Arabidopsis flower development and suggest that CSN regulates Arabidopsis flower development in part by modulating SCFUFO-mediated AP3 activation.

Original languageEnglish
Pages (from-to)1071-1082
Number of pages12
JournalPlant Cell
Volume15
Issue number5
DOIs
Publication statusPublished - May 2003

Keywords

  • UNUSUAL FLORAL ORGANS
  • UBIQUITIN-DEPENDENT PROTEOLYSIS
  • HOMEOTIC GENE APETALA3
  • AUXIN RESPONSE
  • LIGHT CONTROL
  • PROTEIN-DEGRADATION
  • MERISTEM IDENTITY
  • COMPLEX
  • EXPRESSION
  • BOX

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