Immunoaffinity chromatography of canine high-molecular-weight renin: partial purification and characterization.
Canine high-molecular-weight renin (mol. wt. 60 000) is believed to be a complex of renin (low-molecular-weight form, mol. wt. 40 000) and renin-binding substance. The immunocross-reactivity of high-molecular-weight renin and low-molecular-weight renin was demonstrated by using antibodies specific to low-molecular-weight renin. Immunoaffinity chromatography with renin-specific antibodies coupled to Sepharose provided a simple and specific method for isolation of high-molecular-weight renin. High-molecular-weight renin with a specific activity of 137 600 ng of ANG I h-1 mg-1 of protein (19.6 Goldblatt units/mg of protein) was obtained. This high-molecular-weight renin was stable in dithiothreitol (25 mmol/l), suggesting that disulphide bonds may not be involved in the binding mechanism between low-molecular-weight renin and renin-binding substance. However, exposure to low pH (3.0) resulted in conversion of high-molecular-weight renin into the low-molecular-weight form.
D000818:Animals; D000906:Antibodies / Q000276:immunology; D002846:Chromatography, Affinity / Q000379:methods; D002850:Chromatography, Gel; D004285:Dogs; D007668:Kidney / Q000201:enzymology; D008970:Molecular Weight; D012083:Renin / Q000276:immunology / Q000302:isolation & purification*
D000906:Antibodies; D012083:Renin