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Abstract
1. 1. Five kinds of subunits (A—E) are involved in generating 14 isozymes of lactic dehydrogenase (LDH) in skeletal muscle of Salmo namaycush and S. fontinalis. One group of 5 LDHs, migrating near the origin at neutral pH, is derived from random assembly of D and E subunits into tetramers. Another essentially independent series of 9 LDHs, migrating anodally at neutral pH, are formed by a non-random assembly of subunits A, B and C to yield A 4, A 3B 1, A 2B 2, A 1B 3, B 4, B 3C 1, B 2C 2, B 1C 3 and C 4. 2. 2. Liver of lake trout contains 5 LDHs homologous to the A—B series in muscle, but only the homopolymer B 4 is abundant. Brook trout liver has the B—C series with only C 4 in abundance. Liver of S. gairdneri has only the A 4 homologue. 3. 3. The LDHs formed in dissociation-reassociation tests and in interspecies crosses are consistent with the 5-subunit model advanced.
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