Purification of soluble guanylyl cyclase from bovine lung by a new immunoaffinity chromatographic method
| Autor: | Bernd Mayer, K.-D. Hinsch, Feraydoon Niroomand, Doris Koesling, Peter Humbert, Gabriele Fischer, Günter Schultz, Eycke Böhme, Heinrich Gausepohl, Rainer Frank |
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| Rok vydání: | 1990 |
| Předmět: |
Nitroprusside
chemistry.chemical_classification Hemeprotein Chromatography Molecular mass Immunoblotting Peptide Fast protein liquid chromatography Biochemistry Chromatography Affinity Enzyme Activation Enzyme activator Enzyme Solubility Affinity chromatography chemistry Guanylate Cyclase Chromatography Gel Animals Cattle Electrophoresis Polyacrylamide Gel Soluble guanylyl cyclase Lung |
| Zdroj: | European Journal of Biochemistry. 190:273-278 |
| ISSN: | 1432-1033 0014-2956 |
| DOI: | 10.1111/j.1432-1033.1990.tb15572.x |
| Popis: | Soluble guanylyl cyclase was purified from bovine lung by an immunoaffinity chromatographic method using IgG fractions of antisera against a synthetic peptide of the C-terminus of the 70-kDa subunit of the enzyme. After anion-exchange chromatography, the enzyme was bound to an immunoaffinity column and was eluted with the synthetic peptide. This method allowed the convenient isolation of 2 mg of apparently homogeneous enzyme from 40 g cytosolic proteins. The enzyme had an apparent molecular mass of about 150 kDa and consisted of two subunits (70 kDa and 73 kDa) as determined by gel permeation fast protein liquid chromatography and SDS/PAGE. The basal activities determined in the presence of Mg2+ and Mn2+ were 10-20 nmol.min-1.mg-1 and 80-100 nmol.min-1.mg-1, respectively. The enzyme exhibited an ultraviolet-visible absorption spectrum typical for hemoproteins, with a Soret band at 430 nm. The purified enzyme was stimulated by NO-containing compounds. Maximal enzyme activities measured in the presence of sodium nitroprusside were 1.2-2.4 mumol.min-1.mg-1 (half-maximal effect of sodium nitroprusside at 1.3-1.9 microM) and 0.9-1.8 mumol.min-1.mg-1 (half-maximal effect at 0.28-0.41 microM sodium nitroprusside) in the presence of Mg2+ and Mn2+, respectively. The method developed for the large-scale purification of soluble guanylyl cyclase by immunoaffinity chromatography, using synthetic peptides for the elution of the enzyme, appears to be superior to previously described methods. As antibodies against synthetic peptides corresponding to deduced amino acid sequences of the respective protein are easily obtained, the described method may be suitable for a convenient large-scale purification of various proteins. |
| Databáze: | OpenAIRE |
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