생명과학회지 (Journal of Life Science)

  • 제14권4호
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  • Pages.708-715
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  • 2004
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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칠성장어(Lampetra japnica) 간조직 젖산탈수소효소와 대구(Gadus macrocephalus) liver-Specific C4동위효소의 특성 및 진화적 관계

Characterization and Evolutionary Relationship of Lactate Dehydrogenase in Liver of Lampetra japonica and Liver-specific C4 Isozyme in Gadus macrocephdus.

  • 박선영 (동신제약 중앙연구소) ;
  • 조성규 (청주대학교 생명유전통계학부 생명과학전) ;
  • 염정주 (청주대학교 생명유전통계학부 생명과학전공)
  • 발행 : 2004.08.01
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초록

칠성장어(Lampetra japonica) 간조직 젖산탈수소효소(EC 1.1.1.27, lactate dehydrogenase, LDH) 동위효소는 affinity chromatography에서 buffer를 유입한 후 용출된 분획에서 정제되었다. 대구(Gadus macrocephalus)의 liver-specific $C_4$동위효소는 열처리한 후 affinity chromatography하여 NAD+ 를 함유한 buffer에서 용출되기 시작하여 buffer를 유입한 후 $B_4$ 동위효소와 함께 용출되어, DEAE-Sephacel chromatography에 의해 정제되었다. 대구 간조직에서 열에 대한 안정성은$C_4$$B_4$$A_4$ 동위효소의 순서로 나타났다. Chromate-focusing에 의해 정제한 칠성장어 간조직의 pH 7.45 분획의 LDH 동위효소는 정제된 간조직 LDH보다 피루브산에 의한 기질저해도가 컸다. 칠성장어 간조직 LDH의 최적 pH는 7.5, liver-specific $C_4$동위효소는 pH 8.5였다. 칠성장어 간조직 LDH는 항원-항체반응에서 꺽지 $A_4$ 항체와 liver-specific $C_4$ 항체의 순서로 반응하였고 eye-specific $C_4$ 항체와는 반응 정도가 낮았다. 따라서 칠성장어 간조직 LDH는 하부단위체 A와 liver-specific $C_4$의 구조와 유사하게 진화되었으며, 하부단위체 C 는 진화속도가 매우 빠른 것으로 확인되었다. 칠성장어 간조직의 LDH는 단일 동위효소가 아니라, 하부단위체 A, B 및 C로 구성된 동위효소들인 것으로 사료된다.

The lactate dehydrogenase (EC 1.1.1.27, LDH) in liver of Lempetra japonica was purified in buffer of affinity chromatography. The liver-specific $C_4$ isozyme of Gadus macrocephalus was purified by heat treatment, affinity chromatography, and DEAE-Sephacel chromatography. The liver-specific $C_4$ isozyme was eluted in a buffer containing NAD+ and was coeluted with $B_4$isozyme in plain buffer of affinity chromagraphy. Liver-specific $C_4$ isozyme in G. macrocephalus was the most thermostable, and$B_4$isozyme was more stable than $A_4$. The LDH in the fraction of pH 7.45 purified from the liver of L. iaponica by chromatofocusing was more inhibited by pyruvate than purified LDH. The optimum pH of the LDH isozyme in the liver of L. japonica was 7.5 and that of liver-specific$C_4$ isozyme was 8.5. The LDH in liver of L. japonica made complexes more with antibody against Coreoperca herzi$A_4$ and liver-specific $C_4$ than with that against eye-specific $C_4$. Therefore, the structure of the LDH in liver of L. japonica might be similarly evolved to that of subunit A and liver-specific $C_4$ isozyme in liver tissue of G. macrocephalus. The evolution rate of subunit C is faster than that of subunit A. LDH in liver of L. japonica has not one isozyme but isozymes and it was also found out to have not only subunit A and B but also subunit C.

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