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Title: Proteomics and transcriptomics analyses of Arabidopsis floral buds uncover important functions of ARABIDOPSIS SKP1-LIKE1

The ARABIDOPSIS SKP1-LIKE1 (ASK1) protein functions as a subunit of SKP1-CUL1-F-box (SCF) E3 ubiquitin ligases. Previous genetic studies showed that ASK1 plays important roles in Arabidopsis flower development and male meiosis. However, the molecular impact of ASK1-containing SCF E3 ubiquitin ligases (ASK1-E3s) on the floral proteome and transcriptome is unknown. Here we identified proteins that are potentially regulated by ASK1-E3s by comparing floral bud proteomes of wild-type and the ask1 mutant plants. More than 200 proteins were detected in the ask1 mutant but not in wild-type and >300 were detected at higher levels in the ask1 mutant than in wild-type, but their RNA levels were not significantly different between wild-type and ask1 floral buds as shown by transcriptomics analysis, suggesting that they are likely regulated at the protein level by ASK1-E3s. Integrated analyses of floral proteomics and transcriptomics of ask1 and wild-type uncovered several potential aspects of ASK1-E3 functions, including regulation of transcription regulators, kinases, peptidases, and ribosomal proteins, with implications on possible mechanisms of ASK1-E3 functions in floral development. In conclusion, our results suggested that ASK1-E3s play important roles in Arabidopsis protein degradation during flower development. This study opens up new possibilities for further functional studies of these candidatemore » E3 substrates.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Pennsylvania State Univ., University Park, PA (United States); Univ. of California, Berkeley, CA (United States)
  3. Pennsylvania State Univ. College of Medicine, Hershey, PA (United States)
  4. Fudan Univ., Shanghai (China)
Publication Date:
OSTI Identifier:
1252725
Grant/Contract Number:
FG02-02ER15332
Type:
Accepted Manuscript
Journal Name:
BMC Plant Biology
Additional Journal Information:
Journal Volume: 16; Journal Issue: 1; Journal ID: ISSN 1471-2229
Publisher:
BioMed Central
Research Org:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
Arabidopsis; ASK1; E3 ubiquitin ligase; mass spectrometry; protein degradation; proteomics; transcriptomics