The clip-segment of the von Willebrand domain 1 of the BMP modulator protein Crossveinless 2 is preformed.
Bone Morphogenetic Proteins (BMPs) are secreted protein hormones that act as morphogens and exert essential roles during embryonic development of tissues and organs. Signaling by BMPs occurs via hetero-oligomerization of two types of serine/threonine kinase transmembrane receptors. Due to the small number of available receptors for a large number of BMP ligands ligand-receptor promiscuity presents an evident problem requiring additional regulatory mechanisms for ligand-specific signaling. Such additional regulation is achieved through a plethora of extracellular antagonists, among them members of the Chordin superfamily, that modulate BMP signaling activity by binding. The key-element in Chordin-related antagonists for interacting with BMPs is the von Willebrand type C (VWC) module, which is a small domain of about 50 to 60 residues occurring in many different proteins. Although a structure of the VWC domain of the Chordin-member Crossveinless 2 (CV2) bound to BMP-2 has been determined by X-ray crystallography, the molecular mechanism by which the VWC domain binds BMPs has remained unclear. Here we present the NMR structure of the Danio rerio CV2 VWC1 domain in its unbound state showing that the key features for high affinity binding to BMP-2 is a pre-oriented peptide loop.
Julius-von-Sachs Institut für Biowissenschaften der Universität Würzburg, Julius-von-Sachs Platz 2, Würzburg D-97082, Germany. mueller@biozentrum.uni-wuerzburg.de.
Juliane E
JE
Fiebig
Stella E
SE
Weidauer
Li-Yan
LY
Qiu
Markus
M
Bauer
Peter
P
Schmieder
Monika
M
Beerbaum
Jin-Li
JL
Zhang
Hartmut
H
Oschkinat
Walter
W
Sebald
Thomas D
TD
Mueller
D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000818:Animals; D055396:Bone Morphogenetic Protein 2 / Q000737:chemistry; D017124:Conserved Sequence; D003553:Cystine / Q000737:chemistry; D020690:GTPase-Activating Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D011485:Protein Binding; D017510:Protein Folding; D054730:Protein Interaction Domains and Motifs; D017433:Protein Structure, Secondary; D015027:Zebrafish; D029961:Zebrafish Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism
D055396:Bone Morphogenetic Protein 2; D003553:Cystine; D020690:GTPase-Activating Proteins; D029961:Zebrafish Proteins; C509801:crossveinless 2 protein, zebrafish