Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Distribution and Role of Mitochondrial Lactate Dehydrogenase Isozymes in Bird and Mammals

조류 및 포유류 내 미토콘드리아 젖산탈수소효소 동위효소들의 분포와 역할

  • Received : 2017.03.20
  • Accepted : 2017.05.02
  • Published : 2017.05.30
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Abstract

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 $C_4$ isozyme was expressed in testis in addition to the LDH $A_4$, $A_3B$, $A_2B_2$, $AB_3$, and $B_4$ isozymes. A single LDH AB hybrid isozyme was expressed in the chicken mitochondria. In mammals, mitochondrial LDH isozymes were differed according to tissues. LDH $A_4$ and testis-specific LDH $C_4$ isozymes were expressed in the mitochondria of mice. The mitochondrial testis-specific LDH $C_4$ isozyme was expressed only in the mice. In the golden hamster mitochondria, the LDH $B_4$ 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.

조류 및 포유류에서 미토콘드리아를 분리하고 모노아민산화효소(EC 1.4.3.4, monoamine oxidase)의 활성을 측정하여 미토콘드리아의 분리도를 확인하였다. 미토콘드리아 각 분획에서 젖산탈수소효소(EC 1.1.1.27, lactate dehydrogenase, LDH)의 발현도를 생화학적 및 면역화학적 방법으로 분석하였다. 조류에 비하여 포유류에서는 미토콘드리아 LDH의 활성이 낮은 것으로 나타났다. 따라서 미토콘드리아 LDH의 역할은 포유류보다 조류에서 중요시된다고 생각된다. 조류 및 포유류 모든 조직의 단백질양은 세포기질보다 미토콘드리아에서 적게 나타났다. 생쥐와 골든햄스터의 세포기질에서는 LDH $A_4$, $A_3B$, $A_2B_2$, $AB_3$ 및 $B_4$ 다섯 가지 동위효소 이외에 testis-specific LDH $C_4$ 동위효소가 정소 조직에서 나타났다. 닭의 미토콘드리아 내에서는 AB hybrid형 동위효소 한 종류가 나타났다. 포유류에서 미토콘드리아 LDH 동위효소들은 조직 별로 다르게 나타났다. 생쥐의 미토콘드리아 내에서는 LDH $A_4$ 및 testis-specific $C_4$ 동위효소가 나타났다. 미토콘드리아 testis-specific LDH $C_4$ 동위효소는 생쥐에서만 나타났다. 골든햄스터 미토콘드리아 내에서는 LDH $B_4$ 동위효소가 lactate oxidase로서 작용하였다. 조류 및 포유류의 대사조건 및 서식환경에 따라 미토콘드리아 LDH 동위효소의 역할도 구분되는 것으로 생각된다.

Keywords

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