Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Kinesin Superfamily-associated Protein 3 (KAP3) Mediates the Interaction between Kinesin-II Motor Subunits and HS-1-associated Protein X-1 (HAX-1) through Direct Binding

Kinesin superfamily-associated protein 3 (KAP3)를 통한 HS-1-associated protein X-1 (HAX-1)과 Kinesin-II의 결합

  • Jang, Won Hee (Departments of Biochemistry, College of Medicine and UHRC, Inje University) ;
  • Seog, Dae-Hyun (Departments of Biochemistry, College of Medicine and UHRC, Inje University)
  • 장원희 (인제대학교 의과대학 생화학교실) ;
  • 석대현 (인제대학교 의과대학 생화학교실)
  • Received : 2013.08.01
  • Accepted : 2013.08.16
  • Published : 2013.08.30
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Abstract

Kinesin-II, a molecular motor, consists of two different motor subunits, KIF3A and KIF3B, and one large kinesin superfamily-associated protein 3 (KAP3), forming a heterotrimeric complex. KAP3 is associated with the tail domains of motor subunits. However, its exact role remains unclear. Here, we demonstrated KAP3 binding to the carboxyl (C)-terminal tail region of HS-associated protein X-1 (HAX-1). HAX-1 bound to the C-terminal region of KAP3, but not to KIFs (KIF3A, KIF3B, and KIF5B) and the kinesin light chain (KLC) in the yeast two-hybrid assays. The interaction was further confirmed in the glutathione S-transferase (GST) pull-down assay and by co-immunoprecipitation. Anti- HAX-1 antibody as well as anti-KIF3A antibody co-immunoprecipitated KIF3B and KAP3 from mouse brain extracts. These results suggest that KAP3 could mediate the interaction between Kinesin-II and HAX-1.

Kinesin-II는 다양한 운반체들을 미세소관을 따라 운반하는 motor 단백질의 하나이다. Kinesin-II는 두 개의 motor 단백질 KIF3A와 KIF3B, 그리고 motor 단백질의 말단에 결합하는 kinesin superfamily-associated protein 3 (KAP3)로 구성되어 있다. KAP3는 Kinesin-II의 기능에 중요한 역할을 하는 것으로 알려져 있으나 명확한 기능은 아직 밝혀지지 않았다. 본 연구에서 KAP3와 결합하는 단백질을 분리하기 위하여 효모 two-hybrid system을 사용하여 탐색한 결과 HS-1-associated protein X-1 (HAX-1)을 분리하였다. KAP3은 HAX-1의 C-말단 부위와 결합하며, HAX-1은 KAP3의 C-말단부위와 결합함을 효모 two-hybrid assay로 확인하였다. 그러나, HAX-1는 KIF3A, KIF3B, KIF5B, 그리고 kinesin light chain (KLC)과는 결합하지 않았다. KAP3와 HAX-1의 단백질 결합은 glutathione S-transferase (GST) pull-down assay와 공동면역침강으로 추가 확인하였다. 생쥐의 뇌 파쇄액을 HAX-1 항체와 KIF3A 항체로 면역침강을 행한 결과 Kinesin-II의 구성단백질인 KIF3B와 KAP3가 같이 침강하였다. 이러한 결과들은 KAP3가 Kinesin-II와 HAX-1의 결합을 매개한다는 것을 시사한다.

Keywords

References

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