Antibodies raised against the V-ATPase ‘a’ subunit isoforms a1 and a2 were generated in our laboratory. The mouse anti-a2V neutralizing antibody against 488–510 amino acids of trans-membrane region (Antibody clone 2C1) and rabbit anti-a2NTD against N terminal domain (Antibody Clone 470) were used as described previously [25 (link), 44 (link), 60 (link)]. Anti a1 antibody was raised in rabbit against the synthetic peptides from unique regions of a1 (amino acids 73–95; RKANIPIMDTGENPEVPFPRD) by Covance (USA) and anti a3 antibody was purchased from Abnova, USA. Notch1 (antibody clone EP1238Y) and organellar markers Rab5, Pan-Cadherin and Golph4 were from Abcam. For Western Blot we used cleaved Notch1 antibody Val1744 (Cell signaling, Danvers, MA), Jagged1 (Antibody clone H114, Santa-Cruz, CA), LC3B (Abcam). β-actin (antibody clone AC-74) was purchased from Sigma Aldrich and used as the loading control. For immunohistochemistry we used Notch-1(Santa-Cruz, antibody clone C-20), and anti-a2V. For flow cytometry we used Notch1-APC (Biolegend, San Diego, CA) and FITC conjugated anti-a2V (Covance, Princeton, NJ).
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