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KMID : 0613820170270050530
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Journal of Life Science
2017 Volume.27 No. 5 p.530 ~ p.535
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Distribution and Role of Mitochondrial Lactate Dehydrogenase Isozymes in Bird and Mammals
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Cho Sung-Kyu
Yum Jung-Joo
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Abstract
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Mitochondria were isolated from bird and mammals. The activity of monoamine oxidase (EC 1.4.3.4) was then measured to identify mitochondrial isolation. Lactate dehydrogenase (EC 1.1.1.27, lactate dehydrogenase, LDH) isozymes in mitochondrial fractions were analyzed by biochemical and immunochemical methods. The activity of mitochondrial LDH was lower in mammals than in bird. Therefore, the role of mitochondrial LDH seems to be more important in bird than in mammals. The concentration of protein in all tissues of bird and mammals was less in the mitochondria than in the cytosol. In the cytosol of mice and golden hamsters, testis-specific LDH C4 isozyme was expressed in testis in addition to the LDH A4, A3B, A2B2, AB3, and B4 isozymes. A single LDH AB hybrid isozyme was expressed in the chicken mitochondria. In mammals, mitochondrial LDH isozymes were differed according to tissues. LDH A4 and testis-specific LDH C4 isozymes were expressed in the mitochondria of mice. The mitochondrial testis-specific LDH C4 isozyme was expressed only in the mice. In the golden hamster mitochondria, the LDH B4 isozyme functioned as a lactate oxidase. As our results show, the mitochondrial LDH seemed to be playing the different role in the bird and mammals in relation with their metabolic conditions and habitats.
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KEYWORD
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Cytosolic LDH, isozyme, lactate dehydrogenase, mitochondrial LDH
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