Immunochemical studies of human prolidase with monoclonal and polyclonal antibodies: absence of the subunit of prolidase in erythrocytes from a patient with prolidase deficiency.
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| Abstract |
Prolidase was highly purified from human liver and erythrocytes. NaDodSO4/acrylamide gel electrophoresis revealed that these preparations contained a major protein with MW = 56,000. The mass of prolidase was estimated on gel filtration to be MW = 97,000, for both enzyme preparations. A monoclonal antibody was raised against the liver enzyme and a specific antiserum against the erythrocyte enzyme. The monoclonal antibody (EP-2) recognized prolidase from erythrocytes and liver, in equal proportions. The antiserum also recognized the enzyme from erythrocytes and liver. Immunoprecipitation studies with these antibodies suggested only a single species of prolidase in erythrocytes and liver. Using an immobilized monoclonal antibody (EP-2) as an immunoadsorbent, prolidase was partially purified from crude extracts, and the protein of the partially purified enzyme was identified by immunoblotting using antiserum. A protein band with a MW = 56,000 was demonstrated specifically when crude extracts from the liver and erythrocytes were examined using NaDodSO4/acrylamide gel electrophoresis. The subunit protein was absent in erythrocytes from a patient with prolidase deficiency. We propose that the absence of the subunit is one cause of the prolidase deficiency.
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| Authors | F Endo, K Motohara, Y Indo, I Matsuda |
| Journal | Pediatric research (Pediatr Res) Vol. 22 Issue 6 Pg. 627-33 (Dec 1987) ISSN: 0031-3998 [Print] United States |
| PMID | 3324031 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Chemical References |
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