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KMID : 0613820160260101105
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Journal of Life Science
2016 Volume.26 No. 10 p.1105 ~ p.1112
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Metabolic Adjustments of Lactate Dehydrogenase Isozymes to the Environmental Temperature in Bluegill (Lepomis macrochirus)
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Ku Bo-Ra
Cho Sung-Kyu
Yum Jung-Joo
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Abstract
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The aim of this study was to examine the metabolic adjustment of lactate dehydrogenase (EC 1.1.1.27, LDH) isozymes to the environmental temperature in bluegill (Lepomis macrochirus). This study included three groups of bluegill collected in April (group Ⅰ), May (group Ⅱ), and September (group Ⅲ). The LDH activities of skeletal muscle, heart, and brain tissues were higher in group Ⅲ than in groups Ⅰ and Ⅱ. The citrate synthase (EC 4.1.3.7, CS) activity was higher in skeletal muscle but lower in heart and brain tissues of group Ⅱ as compared to group Ⅰ. In contrast, the CS activity was lower in skeletal muscle and higher in heart and brain tissues in group Ⅲ than in group Ⅱ. Furthermore, the LDH/CS activity ratio was higher in the skeletal muscle and brain in group Ⅲ than in groups Ⅰ and Ⅱ. Accordingly, anaerobic metabolism was increased in group Ⅲ. LDH A4, A2B2, and B4 isozymes were expressed in skeletal muscle, heart, liver, and brain tissues. The LDH C hybrid was detected in brain tissue. The LDH A4 isozyme was successfully purified by affinity chromatography. The molecular weight of the purified LDH A4 isozyme was 136 kDa and its optimal pH for enzymatic activity was 8.0. The KmPYR values of LDH in skeletal muscle were 0.161-0.227 mM using pyruvate as a substrate. These kinetic properties of LDH in skeletal muscle are consistent with the fact that bluegill is a cold-adapted species. These results may be useful for predicting the habitat use of this fish.
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KEYWORD
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Bluegill (Lepomis macrochirus), citrate synthase (CS), isozyme, lactate dehydrogenase (LDH)
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