title: Shaping BMP morphogen gradients through enzyme-substrate interactions.
abstract: Bone morphogenetic proteins (BMPs) regulate dorsal/ventral (D/V) patterning across the animal kingdom; however, the biochemical properties of certain pathway components can vary according to species-specific developmental requirements. For example, Tolloid (Tld)-like metalloproteases cleave vertebrate BMP-binding proteins called Chordins constitutively, while the Drosophila Chordin ortholog, Short gastrulation (Sog), is only cleaved efficiently when bound to BMPs. We identified Sog characteristics responsible for making its cleavage dependent on BMP binding. "Chordin-like" variants that are processed independently of BMPs changed the steep BMP gradient found in Drosophila embryos to a shallower profile, analogous to that observed in some vertebrate embryos. This change ultimately affected cell fate allocation and tissue size and resulted in increased variability of patterning. Thus, the acquisition of BMP-dependent Sog processing during evolution appears to facilitate long-range ligand diffusion and formation of a robust morphogen gradient, enabling the bistable BMP signaling outputs required for early Drosophila patterning.
authors.affiliation: Program in Cellular Regulation and Metabolism, NICHD, NIH, Bethesda, MD 20892, USA.
authors.forename: Carolyn E
authors.initials: CE
authors.lastname: Peluso
authors.forename: David
authors.initials: D
authors.lastname: Umulis
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Kim
authors.forename: Michael B
authors.initials: MB
authors.lastname: O'Connor
authors.forename: Mihaela
authors.initials: M
authors.lastname: Serpe
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D030801:Animals, Genetically Modified; D019521:Body Patterning / Q000235:genetics / Q000502:physiology*; D019485:Bone Morphogenetic Proteins; D004330:Drosophila; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian; D018507:Gene Expression Regulation, Developmental; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism; D047468:Immunoprecipitation; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D008958:Models, Molecular; D011485:Protein Binding / Q000235:genetics; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*
chemical_list: D019485:Bone Morphogenetic Proteins; D029721:Drosophila Proteins; D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; C064196:dpp protein, Drosophila; C091428:sog protein, Drosophila; C054234:chordin