Abstract
Background: Growth/differentiation factor 8 (GDF8) and GDF11 are two highly similar members of the transforming growth factor β (TGFβ) family. While GDF8 has been recognized as a negative regulator of muscle growth and differentiation, there are conflicting studies on the function of GDF11 and whether GDF11 has beneficial effects on age-related dysfunction. To address whether GDF8 and GDF11 are functionally identical, we compared their signaling and structural properties. Results: Here we show that, despite their high similarity, GDF11 is a more potent activator of SMAD2/3 and signals more effectively through the type I activin-like receptor kinase receptors ALK4/5/7 than GDF8. Resolution of the GDF11:FS288 complex, apo-GDF8, and apo-GDF11 crystal structures reveals unique properties of both ligands, specifically in the type I receptor binding site. Lastly, substitution of GDF11 residues into GDF8 confers enhanced activity to GDF8. Conclusions: These studies identify distinctive structural features of GDF11 that enhance its potency, relative to GDF8; however, the biological consequences of these differences remain to be determined.
Original language | English (US) |
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Article number | 19 |
Journal | BMC Biology |
Volume | 15 |
Issue number | 1 |
DOIs | |
State | Published - Mar 3 2017 |
Externally published | Yes |
Keywords
- Ligands
- Myostatin
- Receptor
- Structure
- Transforming growth factor β (TGFβ)
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Ecology, Evolution, Behavior and Systematics
- Biochemistry, Genetics and Molecular Biology(all)
- Structural Biology
- Physiology
- Biotechnology
- Plant Science
- Cell Biology
- Developmental Biology