Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Interaction of Ras-GTPase-activating Protein SH3 Domain-binding Proteins 2, G3BP2, With the C-terminal Tail Region of KIF5A

Ras-GTPase-activating protein SH3 domain-binding proteins 2, G3BP2와 KIF5A C-말단 꼬리 영역과의 결합

  • Jeong, Young Joo (Department of Biochemistry, Inje University College of Medicine) ;
  • Jang, Won Hee (Department of Biochemistry, Inje University College of Medicine) ;
  • Lee, Won Hee (Department of Neurosurgery, Inje University College of Medicine) ;
  • Kim, Mooseong (Department of Neurosurgery, Inje University College of Medicine) ;
  • Kim, Sang-Jin (Department of Neurology, Inje University College of Medicine) ;
  • Urm, Sang-Hwa (Department of Preventive Medicine, Inje University College of Medicine) ;
  • Moon, Il Soo (Departments of Anatomy, College of Medicine, Dongguk University) ;
  • Seog, Dae-Hyun (Department of Biochemistry, Inje University College of Medicine)
  • 정영주 (인제대학교 의과대학 생화학교실) ;
  • 장원희 (인제대학교 의과대학 생화학교실) ;
  • 이원희 (인제대학교 의과대학 신경외과학교실) ;
  • 김무성 (인제대학교 의과대학 신경외과학교실) ;
  • 김상진 (인제대학교 의과대학 신경과학교실) ;
  • 엄상화 (인제대학교 의과대학 예방의학교실) ;
  • 문일수 (동국대학교 의과대학 해부학교실) ;
  • 석대현 (인제대학교 의과대학 생화학교실)
  • Received : 2017.07.07
  • Accepted : 2017.09.07
  • Published : 2017.10.30
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Abstract

Vesicles and organelles are transported along microtubule and delivered to appropriate compartments in cells. The intracellular transport process is mediated by molecular motor proteins, kinesin, and dynein. Kinesin is a plus-end-directed molecular motor protein that moves the various cargoes along microtubule tracks. Kinesin 1 is first isolated from squid axoplasm is a dimer of two heavy chains (KHCs, also called KIF5s), each of which is associated with the light chain (KLC). KIF5s interact with many different binding proteins through their carboxyl (C)-terminal tail region, but their binding proteins have yet to be specified. To identify the interacting proteins for KIF5A, we performed the yeast two-hybrid screening and found a specific interaction with Ras-GTPase-activating protein (GAP) Src homology3 (SH3)-domain-binding protein 2 (G3BP2), which is involved in stress granule formation and mRNA-protein (mRNP) localization. G3BP2 bound to the C-terminal 73 amino acids of KIF5A but did not interact with the KIF5B, nor the KIF5C in the yeast two-hybrid assay. The arginine-glycine-glycine (RGG)/Gly-rich region domain of G3BP2 is a minimal binding domain for interaction with KIF5A. However, G3BP1 did not interact with KIF5A. When co-expressed in HEK-293T cells, G3BP2 co-localized with KIF5A and was co-immunoprecipitated with KIF5A. These results indicate that G3BP2, which was originally identified as a Ras-GAP SH3 domain-binding protein, is a protein that interacts with KIF5A.

세포 내 소기관들과 소포들은 세포 내에서 미세소관을 따라 적절한 구획으로 수송된다. 이러한 세포 내 수송과정은 분자 모터단백질인 kinesin과 dynein에 의하여 이루어진다. Kinesin 1은 오징어 축삭돌기 세포질로부터 처음 분리되었으며 2개의 중쇄단위체(KHCs, 또는 KIF5s) 및 이와 결합하는 경쇄단위체(KLCs)의 복합체를 형성한다. KIF5s는C-말단 고리 영역을 통해 많은 다양한 단백질과 결합하는데, 아직 그 결합단백질들은 충분히 밝혀지지 않았다. 본 연구에서는 KIF5A 결합단백질을 분리하기 위하여 효모 two-hybrid 탐색을 수행하여 스트레스 과립형성과 mRNP 위치결정에 관여하는 Ras-GTPase-activating protein (GAP) Src homology3 (SH3)-domain-binding protein 2 (G3BP2)를 분리하였다. G3BP2는 KIF5A의 C-말단 고리 영역에 존재하는 73개 아미노산을 포함하는 영역과 결합하였다. 그러나 G3BP2는 KIF5B, KIF5C, KLC1, KIF3A와는 결합하지 않았다. KIF5A는 G3BP2의 arginine-glycine-glycine(RGG)/Gly-rich 도메인과 결합하지만 G3BP1과는 결합하지 않았다. HEK-293T세포에 G3BP2와 KIF5A를 발현하여 면역침강한 결과 G3BP2와 KIF5A는 같이 침강하였다. 또한 HEK-293T 세포 내의 전체에서 두 단백질은 같은 부위에 존재하였다. 이러한 결과들은 세포 내에서 G3BP2는 KIF5A와 결합하는 결합단백질로 확인 되었다.

Keywords

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