Abstract |
Poly- ubiquitin chains are post-translational modifications commonly used by the ubiquitin- proteasome system to mark proteins for degradation. The regulation of protein degradation plays an important role in regulating muscle cell size, a cellular process balanced by protein synthesis and catabolism. MaFBx/Atrogin-1, a muscle specific F-box protein, is a principle component of the SCF(atrogin-1) ubiquitin ligase complex that ubiquitinates and targets calcineurin for degradation, a key regulatory protein involved in pathologic hypertrophy. We have recently described a novel role for this ubiquitin ligase as a co-activator of the FOXO transcription factors through the catalysis of non-canonical poly- ubiquitin chain formation on FOXO proteins, an event that is sufficient to block Akt-dependent pathways involved in physiologic hypertrophy. In context with other reports describing the regulation and role of FOXO transcription factors, we present a working model for the role of atrogin-1 in both physiologic and pathologic hypertrophy.
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Authors | Jonathan C Schisler, Monte S Willis, Cam Patterson |
Journal | Cell cycle (Georgetown, Tex.)
(Cell Cycle)
Vol. 7
Issue 4
Pg. 440-3
(Feb 15 2008)
ISSN: 1551-4005 [Electronic] United States |
PMID | 18235241
(Publication Type: Journal Article, Review)
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Chemical References |
- Forkhead Transcription Factors
- Muscle Proteins
- FBXO32 protein, human
- SKP Cullin F-Box Protein Ligases
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Topics |
- Cardiomegaly
(metabolism)
- Forkhead Transcription Factors
(metabolism)
- Humans
- Models, Biological
- Muscle Proteins
(metabolism)
- Muscles
(metabolism)
- SKP Cullin F-Box Protein Ligases
(metabolism)
- Signal Transduction
(physiology)
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