Binding of EGF domains 1C12 of Notch3 to ligand was not observed in agreement with existing findings where a different set of EGF-like repeats has been suggested to be involved in ligand binding [30]. of 2 replicates. (B): Co-culturing between HEK-Notch2 and HEK-Jag1 cells confirms that the 4 anti-NRR2 antibodies have maintained functionality when produced as bivalent Fc-fusions. DAPT was used as control of Notch inhibition. Luciferase activity in unblocked cultures (Jag+) was used to normalize data in both A and B. mmc2.pdf (27K) GUID:?87E94474-4A4E-41CC-A601-151110349F18 Supplementary Fig. 3 Receptor-specific inhibition of Notch1 and 2 by addition of blocking antibodies to cells cultured on immobilised ligand. Blocking antibodies specifically also inhibit signalling through Notch1 and 2 when immobilised Jagged1 is used to activate the receptors. Cells expressing Notch receptors 1-3 were cultured on immobilised ligand Jagged1 (Jag1-Fc) and receptor activation confirmed by expression of the reporter gene luciferase. (A): Notch1 signalling is efficiently inhibited by the anti-NRR1 antibody N1_E6 but not by antibodies targeting Notch2. (B): Signalling in HEK-Notch2 cells is blocked with anti-NRR2 antibodies N2_B6 and N2_B9 but not with N1_E6. (C): Antibodies directed to Notch1 (N1_E6) or Notch2 (N2_B6 and N2_B9) do not interfere with signalling in cells expressing Notch3. A control antibody targeting the unrelated protein Shc1 has no effect on Notch signalling and was used to normalize the relative luciferase activity. A recombinant human Fc protein (Fc) was used as negative control and illustrates the basal luciferase activity in this assay. All values represent an average of 2 or more experiments. mmc3.pdf (27K) GUID:?EAEA6933-94C6-4135-9103-3076CEEE685C Supplementary Fig. 4 Sequence alignment of Notch regulatory Labetalol HCl regions (NRRs) from human and mouse Notch 1-4. (A) Sequence alignment of the NRRs of human (hNRR) and mouse (mNRR) Notch receptors 1-4 reveals the high homology between receptors of both species. (B) The percentage of identical amino acid residues between individual NRRs of human and mouse further highlights the conservation between the 2 species (filled boxes) and that the NRR of Notch4 is the most distant receptor in both species. The degree of conservation is represented by the shading: low/non-similar (white background), conservative (white on grey background), identical (black on grey background). mmc4.pdf (66K) GUID:?C0F15CCD-9D44-4826-849A-ECA70A5F60B2 Supplementary Fig. 5 Verification of Notch expression in Rabbit Polyclonal to PPIF reporter cells by flow cytometry. (A) HEK-Notch1 cells are positively stained with Notch 1 antibody N1_E6. The antibodies N2_B9 and N3_E10 which are specific for Notch2 and 3 respectively do not stain these cells. (B) Positive staining with the Notch 2 antibody N2_B9 verifies expression of Notch2 in HEK-Notch2 cells. (C) HEK-Notch3 cells are positively stained for Notch3 with the antibody N3_E10 but not for Notch1 or 2. mmc5.pdf (594K) GUID:?51A8846F-BC57-40B6-9D09-3A022A70AD6B Supplementary Fig. 6 Sequences of blocking anti-Notch antibodies. (A) Amino acid sequence of the variable heavy (VH) and variable light (VL) sequences of Notch blocking antibodies N1_E6, N2_B6 and N2_B9 are shown. Positions for complementarity determining regions (CDRs) and framework regions (FW) are indicated. In the comparison between N2_B6 and N2_B9, a dash indicates homology in the 2 2 sequences. (B) DNA sequence of the above clones in the form of single chain Fvs (scFvs) where VH and VL regions are joined by DNA encoding a flexible linker with the amino acid sequence LEGGGGSGGGGSGGGAS. mmc6.pdf (48K) GUID:?ACC27970-40DA-42AA-AD62-F81A606A7E74 Supplementary Table 1 mmc7.pdf (73K) GUID:?484CDC25-C190-4380-BCE5-62AB851220CF Supplementary Table 2 Primer sequences and probes for qRT-PCR. mmc8.pdf (69K) GUID:?5F79916E-BB72-49ED-B6B7-6E041C20C8AC Highlights ? Potent antibodies that antagonise mouse and human Notch signalling Labetalol HCl are generated. ? Receptor specific inhibition of Notch1 and 2 signalling is demonstrated. ? Antibody mediated inhibition of Notch influences neural stem cell differentiation. Keywords: Notch, Antagonistic antibody, Antibody phage-display, Neural stem cell Abstract Notch signalling occurs via direct cellCcell interactions and plays an important role in linking the fates of neighbouring cells. There are four different mammalian Notch receptors that can be activated by five cell surface ligands. The ability to inhibit specific Notch receptors would help identify the roles of individual family members and potentially provide a means to study and control cell differentiation. Anti-Notch antibodies in the form of single chain Fvs were generated from an antibody phage display library by selection on either the ligand binding domain or the negative regulatory region (NRR) of Notch1 and Notch2. Labetalol HCl Six antibodies targeting the NRR of Notch1 and four antibodies recognising the NRR of Notch2 were found to prevent receptor activation in.