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Title: Alternative Binding Modes Identified for Growth and Differentiation Factor-associated Serum Protein (GASP) Family Antagonism of Myostatin

Journal Article · · Journal of Biological Chemistry
 [1];  [1];  [1];  [2];  [2];  [1]
  1. Univ. of Cincinnati, OH (United States)
  2. Johns Hopkins Univ. School of Medicine, Baltimore, MD (United States)

Myostatin, a member of the TGF-β family of ligands, is a strong negative regulator of muscle growth. As such, it is a prime therapeutic target for muscle wasting disorders. Similar to other TGF-β family ligands, myostatin is neutralized by binding one of a number of structurally diverse antagonists. Included are the antagonists GASP-1 and GASP-2, which are unique in that they specifically antagonize myostatin. However, little is known from a structural standpoint describing the interactions of GASP antagonists with myostatin. In this paper, we present the First low resolution solution structure of myostatin-free and myostatin-bound states of GASP-1 and GASP-2. Our studies have revealed GASP-1, which is 100 times more potent than GASP-2, preferentially binds myostatin in an asymmetrical 1:1 complex, whereas GASP-2 binds in a symmetrical 2:1 complex. Additionally, C-terminal truncations of GASP-1 result in less potent myostatin inhibitors that form a 2:1 complex, suggesting that the C-terminal domains of GASP-1 are the primary mediators for asymmetric complex formation. Overall, this study provides a new perspective on TGF-β antagonism, where closely related antagonists can utilize different ligand-binding strategies.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES); American Heart Association (AHA); Muscular Dystrophy Association (MDA)
Grant/Contract Number:
R01AR060636; R01GM105404; 12PRE11790027; 240087
OSTI ID:
1236259
Journal Information:
Journal of Biological Chemistry, Vol. 290, Issue 12; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (13)

Variation in zygotic CRISPR/Cas9 gene editing outcomes generates novel reporter and deletion alleles at the Gdf11 locus journal December 2019
Molecular characterization of latent GDF8 reveals mechanisms of activation journal January 2018
Crystal structure of the WFIKKN2 follistatin domain reveals insight into how it inhibits growth differentiation factor 8 (GDF8) and GDF11 journal April 2019
GASP‐2 overexpressing mice exhibit a hypermuscular phenotype with contrasting molecular effects compared to GASP‐1 transgenics journal January 2020
Biochemistry and Biology of GDF11 and Myostatin: Similarities, Differences, and Questions for Future Investigation journal April 2016
Structural biology of the TGFβ family journal October 2019
Structural basis for potency differences between GDF8 and GDF11 journal March 2017
Structure of the human myostatin precursor and determinants of growth factor latency journal December 2017
Structure of the human myostatin precursor and determinants of growth factor latency. text January 2018
Structural basis for potency differences between GDF8 and GDF11. journalarticle January 2017
Enhancement of C2C12 myoblast proliferation and differentiation by GASP-2, a myostatin inhibitor journal July 2016
Correction to Binding Properties of the Transforming Growth Factor-β Coreceptor Betaglycan: Proposed Mechanism for Potentiation of Receptor Complex Assembly and Signaling journal July 2017
Beyond the Big Five: Investigating Myostatin Structure, Polymorphism and Expression in Camelus dromedarius journal June 2019