title: Regulation of notch signaling via O-glucosylation insights from Drosophila studies.
abstract: Recent work using Drosophila melanogaster has shown that a protein O-glucosyltransferase called Rumi regulates Notch signaling. Studies on several alleles of rumi identified in a forward genetic screen indicated that Rumi is a temperature-sensitive regulator of Notch signaling in flies. Further genetic and rescue experiments demonstrated that Rumi is a general regulator of Drosophila Notch signaling. Biochemical analyses showed that Rumi adds glucose to specific EGF repeats in the extracellular domain of Notch receptor in the Drosophila S2 cell line. Furthermore, RNAi-mediated knockdown of Rumi in this cell line resulted in a severe decrease in the level of O-linked glucose on Notch. In this chapter, we discuss the genetic and biochemical methods used to determine the role of Rumi in the regulation of Notch signaling in flies.
authors.affiliation: Brown Foundation Institute of Molecular Medicine (IMM), Department of Biochemistry & Molecular Biology, The University of Texas Health Science Center at Houston, Houston, Texas, USA.
authors.forename: Tom V
authors.initials: TV
authors.lastname: Lee
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Takeuchi
authors.forename: Hamed
authors.initials: H
authors.lastname: Jafar-Nejad
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D004330:Drosophila / Q000235:genetics* / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000502:physiology*; D057075:Enzyme Assays / Q000379:methods; D005821:Genetic Techniques; D005964:Glucosyltransferases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000502:physiology; D006031:Glycosylation; D006801:Humans; D011499:Protein Processing, Post-Translational / Q000235:genetics / Q000502:physiology; D051880:Receptors, Notch / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism* / Q000502:physiology*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology
chemical_list: D029721:Drosophila Proteins; C497759:N protein, Drosophila; D051880:Receptors, Notch; D005964:Glucosyltransferases; C527374:Rumi protein, Drosophila