생명과학회지 (Journal of Life Science)

  • 제8권2호
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  • Pages.189-196
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  • 1998
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
권호 표지

Mouse 임파구네서 ADP-ribosyltransferse의 glutamic acid 220과 222의 역할

Role of Glutamic Acids 220 and 222 in Mouse Lymphocyte ADP-ribosyltransferase

  • 김현주 (울산대학교 생명과학부)
  • 발행 : 1998.04.01
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초록

다양한 동물세포로부터 그 cDNA가 dlining된 glycosylphosphatidylinositol-linked ADP-ribosyltransferase는 공통적으로 carboxy말단에 풍부한 glutamic acid motif (EEEVLP)를 소유하고 있다. 유사한 motif가 mouse 임파구의 ADP-ribosyltransferase(Yac-2)에서 발견되어진다. Yac-2는 ADP-ribosyltransferase 활성 뿐 아니라 NDA glycohyrolase의 활성도 소유하고 있다. yac-2에 있어, Glutamic acid가 풍부한 motif의 역할을 알아보기 위해 site-directed mutagensis가 수행 되었다. 돌연변이체인 E22OQ, E22OA, E222Q, E222A는 ADP-ribosyltransferase에 대해 불활성을 보였다. 이러한 결과는 Yac-2의 220번과 222번의 glutamic acid가 ADP-ribosyltransferase와 NDA glycohydrolase 활성에 필수적임을 나타내는 것으로, 이는 carboxy말단의 glutamic acid들이 Yac-2 효소의 활성에 중요한 역할을 함을 시사하는 것이라 하겠다.

A family of glycosylphosphatidylinositol-linked ADP-ribosyltransferases, of which cDNAs were cloned from various animal cells, possess a common Glu-rich motif (EEEVLIP) near their carboxyl termini. A similar notif was observed in the sequence of the mouse lymphocyte ADP-ribosyltransferase (Yac-s). Yac-2 has significant NAD glycohydrolase activity as well as ADP-ribosyltransferase activity. To verify the role of the Glu-rich motif in Yac-2, site-directed mutagenesis was performed. Mutants E220Q, E220A, E222A were inactive for ADP-ribosyltransferase activity. For NAD glycohydrolase activity, E220A, E222Q, and E222A were inactive. In contrast, E220Q was active as wild-type. Thus, Glu-220 and Glu-222 in Yac-2 are critical for ADP-ribosyltransferase and NAD glycohydrolase activity, indicating that the Glu-rich motif near the carboxy terminus plays an important role in the Yac-2 enzyme activity.

키워드

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