This domain is found in human Protein jagged-1 (JAG1) and similar sequences mainly found in animals. JAG1 is a ligand for multiple Notch receptors and involved in the mediation of Notch signalling. This protein shows a large extracellular region made of a poorly characterized N-terminal region (Pfam:PF07657), a DSL (Delta/Serrate/Lag-2) domain (Pfam:PF01414), a series of 16 epidermal growth factor (EGF) tandem repeats, and a cysteine-rich juxtamembrane region. This entry represents the second atypical EGF domain, which constitutes the receptor binding region of JAG1 together with the DSL domain and the first atypical EGF domain [6].

1: Three-dimensional structure of the apo form of the N-terminal EGF-like module of blood coagulation factor X as determined by NMR spectroscopy and simulated folding. Ullner M, Selander M, Persson E, Stenflo J, Drakenberg T, Teleman O; Biochemistry. 1992;31:5974-5983. PMID:1627540

2: The 2.8 A crystal structure of Gla-domainless activated protein C. Mather T, Oganessyan V, Hof P, Huber R, Foundling S, Esmon C, Bode W; EMBO J. 1996;15:6822-6831. PMID:9003757

3: Insight into E-selectin/ligand interaction from the crystal structure and mutagenesis of the lec/EGF domains. Graves BJ, Crowther RL, Chandran C, Rumberger JM, Li S, Huang KS, Presky DH, Familletti PC, Wolitzky BA, Burns DK; Nature. 1994;367:532-538. PMID:7509040

4: Insights into the molecular basis of leukocyte tethering and rolling revealed by structures of P- and E-selectin bound to SLe(X) and PSGL-1. Somers WS, Tang J, Shaw GD, Camphausen RT; Cell. 2000;103:467-479. PMID:11081633

5: Structural and functional properties of the human notch-1 ligand binding region. Hambleton S, Valeyev NV, Muranyi A, Knott V, Werner JM, McMichael AJ, Handford PA, Downing AK; Structure. 2004;12:2173-2183. PMID:15576031

6: Exon 6 of human JAG1 encodes a conserved structural unit. Pintar A, Guarnaccia C, Dhir S, Pongor S; BMC Struct Biol. 2009;9:43. PMID:19586525