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곤충세포에서 새로운 퓨전 단백질인 초파리 유래 PGRP-LB를 이용한 인간 PTK6의 과발현 및 생산

High Level Production of human Protein Tyrosine Kinase-6 in Insect Cells Using Drosophila Peptidoglycan Recognition Protein-LB as a fusion protein

  • Kim, Seul-Ki (College of Pharmacy and Research Institute for Drug Development, Pusan National University) ;
  • Kim, Han-Ie (Department of Biochemistry, College of science, Yonsei University) ;
  • Woo, Jae-Sung (Department of Life Science, Pohang University of Science and Technology) ;
  • Cho, Hyun-Soo (Department of Biology, College of science, Yonsei University) ;
  • Jung, Yun-Jin (College of Pharmacy and Research Institute for Drug Development, Pusan National University) ;
  • Lee, Seung-Taek (Department of Biochemistry, College of science, Yonsei University) ;
  • Ha, Nam-Chul (College of Pharmacy and Research Institute for Drug Development, Pusan National University)
  • 발행 : 2007.02.28

초록

단백질 티로신 kinase인 PTK6는 대부분의 유방암에서 과발현되며, 암세포의 증식만을 촉진하는데 역할을 한다. 이 연구에서 PTK6의 활성도메인을 초파리의 peptidoglycan recognition protein (PGRP) -LB 단백질을 퓨전파트너로 사용하여 바큘로바이러스 시스템을에서 과발현하는데 성공하였다. 우리는 PGRP-LB가 바큘로바이러스 시스템에서 잠재적으로 퓨전 단백질로 사용될 수 있는 가능성을 처음으로 발견하였다. 정제된 PTK6단백질은 기존의 박테리아에서 발현된 단백질보다 1.5배 높은 활성을 지녔다. 이 단백질은 PTK6의 분자기전 및 그것의 저해제 개발에 필수적인 결정 구조를 규명하는데 사용될 것이다.

PTK6, an intracellular protein tyrosine kinase, is significantly overexpressed in a majority of breast cancers and has a role in promoting the proliferation of the cancer cells, but not of normal cells. Here, we report high-level production of the catalytic unit of PTK6 fused with Drosophila peptidoglycan recognition protein (PGRT)-LB, in the baculovirus system. We first found that the PGRP-LB was potentially useful as a fusion partner to increase the yield of heterologous protein in the baculovirus system. The purified recombinant protein exhibited a 1.5-fold activity with much higher yield than the bacterially-expressed protein. The protein expressed in the baculovirus system will be useful for the crystallization to determine its crystal structure helping understand the molecular mechanism of PTK6 and design its inhibitors.

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참고문헌

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