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. 1971 Jan;68(1):107–111. doi: 10.1073/pnas.68.1.107

Tetrameric Immune Macroglobulins in Three Orders of Bony Fishes

Ronald T Acton *,†, Peter F Weinheimer *,†, Shelby J Hall *,†, William Niedermeier *,†, Emma Shelton *, J Claude Bennett *,†
PMCID: PMC391172  PMID: 5276279

Abstract

The immune IgM-like macroglobulins were isolated from three species of bony fishes (Ictalurus punctatus, Lepisosteus osseus, and Polyodon spathula) representing the three orders of the subclass Actinopterygii. These macroglobulins were found to have sedimentation coefficients of 14 S and molecular weights of 600,000-630,000. The carbohydrate compositions were determined and found to be different from that of human macroglobulins. After reduction and alkylation, the heavy and light chains could be separated by gel filtration and were found to have molecular weights of approximately 70,000 and 23,000 respectively. The amino acid compositions of these chains were similar to those of mammalian IgM heavy and light chains. The macroglobulins were found by electron microscopy to have a tetrameric structure, in contrast to the pentameric structure found in mammalian, chicken, and shark IgM, i.e. in species later on the evolutionary scale.

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Selected References

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