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Stroud RM, Cantrell JW, Pruitt KM. Interaction of aggregates of reduced insulin with gamma globulin and complement: a pathogenetic hypothesis. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1969; 130:501-4. [PMID: 4179540 DOI: 10.3181/00379727-130-33590] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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227
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Nagaki K, Stroud RM. The Relationship of the Hemolytic Activity of Active C′ls to Its TAMe Esterase Action: A New Method of Purification and Assay. THE JOURNAL OF IMMUNOLOGY 1969. [DOI: 10.4049/jimmunol.102.2.421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Summary
Active C′1s was isolated from the euglobulin fraction of human serum by column chromatography on CM and DEAE cellulose and Pevikon block electrophoresis. The final product revealed a single precipitin line against horse anti-whole human serum on immunoelectrophoresis and did not contain C′1q. A spectrophotometric assay was introduced for measuring the esterase activity of C′1s using TAMe as a substrate. Active C′1s was capable of generating SAC′4,2a although it did not bind to EAC′4 cells and EA. The esterase activity and the hemolytic activity as well as the C′2 and C′4 destructive activity of active C′1s were associated with a single homogeneous protein which migrated to the α-globulin region and had a molecular weight of approximately 110,000. A molecular titration of active C′1s is not possible because active C′1s transfers from site to site; however, SAC′4,2a generating activity could be correlated with TAMe esterase activity. As the ratio of hemolytic to esterase activity of active C′1s was 20 to 40 times less than that of C′1a, the firm binding of C′1a mediated through the combining site for antibody, presumably on the C′1q subunit, increases the efficiency of cleavage and transfer of C′2 at SAC′4.
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Weinheimer PF, Evans EE, Stroud RM, Acton RT, Painter B. Comparative immunology: natural hemolytic system of the spiny lobster, Panulirus argus. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1969; 130:322-6. [PMID: 5762519 DOI: 10.3181/00379727-130-33547] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Nagaki K, Stroud RM. Abstracts of Papers Presented at the Third International Complement Workshop, Harvard Medical School, Boston, Massachusetts, June 3–5, 1968. THE JOURNAL OF IMMUNOLOGY 1968. [DOI: 10.4049/jimmunol.101.4.810.b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Abstract
Active C′1s was purified from human serum by euglobulin precipitation, CM-cellulose chromatography, DEAE-cellulose chromatography, and Pevikon electrophoresis. Molecular weight of active C′1s is between 110,000 and 120,000. Highly purified active C′1s contains no C′1q and gives a single precipitin line in the α-globulin region against anti-whole human serum. This line was correlated with hemolytic and esterase activities. Moreover, the hemolytic activity and esterase activity of C′1s were correlated with C′2 and C′4 destructive activities. Although active C′1s forms SAC′4,2a, it does not bind to EAC′4gp at low ionic strength as does C′1a. Furthermore, kinetics of formation of SAC′4,2a with active C′1s exhibit a different pattern from that with C′1a, suggesting that active C′1s transfers from site to site. A convenient spectrophotometric assay system for esterase activity of active C′1s has been developed for these studies using p-tosyl-l-arginine methyl ester (TAMe) as a substrate.
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Stroud RM, Mayer MM, Miller JA, McKenzie AT. C'2ad, an inactive derivative of C'2 released during decay of EAC'4,2a. IMMUNOCHEMISTRY 1966; 3:163-76. [PMID: 5957242 DOI: 10.1016/0019-2791(66)90182-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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232
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Sitomer G, Stroud RM, Mayer MM. Reversible adsorption of C'2 by EAC'4: role of Mg2+, enumeration of competent SAC'4, two-step nature of C'2a fixation and estimation of its efficiency. IMMUNOCHEMISTRY 1966; 3:57-69. [PMID: 5912034 DOI: 10.1016/0019-2791(66)90282-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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233
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Stroud RM, Austen KF, Mayer MM. Catalysis of C'2 fixation by C'la. Reaction kinetics, competitive inhibition by TAMe, and transferase hypothesis of the enzymatic action of C'la on C'2, one of its natural substrates. IMMUNOCHEMISTRY 1965; 2:219-34. [PMID: 4956916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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