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. 1983 Jun;80(12):3774–3778. doi: 10.1073/pnas.80.12.3774

Characterization of monoclonal antibodies to the sperm-specific lactate dehydrogenase isozyme.

R E Goldman-Leikin, E Goldberg
PMCID: PMC394134  PMID: 6574516

Abstract

The isozyme of lactate dehydrogenase (LDH) that is specific to testes, designated LDH-C4, is the predominant LDH isozyme in mammalian spermatozoa. Four high-affinity monoclonal antibodies have been developed to murine LDH-C4. These antibodies were tested for crossreactivity with LDH-C4 from rat, hamster, rabbit, and human by competitive binding radioimmunoassays. Monoclonal antibodies RG-1 and RG-2 are specific for adjacent or partially overlapping epitopes. The other two monoclonal antibodies each recognize separate and distinct determinants. One of these, designated RG-4, recognizes a sequential determinant that is contained in the coenzyme binding loop, residues 101-115 of the C subunit. Furthermore, RG-4 shows reduced binding affinity for rat LDH-C4 which differs in amino acid sequence at residue 108 and 111 in this region of the molecule. RG-4 also has reduced affinity for LDH-C4 of other species, which is consistent with substitutions in the amino acid sequences of the coenzyme binding loop. These differences between C4 of closely related species is in contrast to the high degree of conservation of this sequence in the LDH-A4 and LDH-B4 isozymes. These results provide useful information regarding homologies among species of LDH-C4 as well as the evolution of this isozyme.

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