Detection of Human NAALADase-like 1/NAALADL1 by Western Blot. |
Western blot shows lysates of human small intestine. PVDF membrane was probed with 1 µg/mL of Sheep Anti-Human NAALADase‑like 1/NAALADL1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5467) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for NAALADase‑like 1/NAALADL1 at approximately 115 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 8.
NAALADase-like1, also known as NAALADL1, (N-acetylated alpha -linked acidic dipeptidase like 1; also Ileal dipeptidylpeptidase) is a 100-115 kDa member of the peptidase M28 family of enzymes. It is found in the brush border of Ileal epithelium and demonstrates serine protease activity. Human NAALADL1 is a type II transmembrane glycoprotein that is 740 amino acids (aa) in length. It contains an extended extracellular domain (aa 29‑740) that shows a protease-associated region (aa 109‑335) with key catalytic residues at Ser617, Asp657 and His687. Multiple splice variants exist. Two show deletions of aa 161‑201 and 296‑330, respectively, while a third shows a 51 aa insertion after Pro359. Three show 18 to 42 aa substitutions after Pro502, with premature truncations after Ile522, Thr543 and Leu579. A final isoform shows a 17 aa substitution for aa 619‑740. Over aa 32‑740, human NAALADL1 shares 81% aa identity with mouse NAALADL1.
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