한빛사논문
Scisung Chung 1, Mi-Sun Kang 2, Dauren S. Alimbetov3, Gil-Im Mun 4, Na-Oh Yunn 5, Yunjin Kim 1, Byung-Gyu Kim 2, Minwoo Wie2, Eun A. Lee 2, Jae Sun Ra 2, Jung-Min Oh6, Donghyun Lee 7, Keondo Lee 7, Jihan Kim 1, Seung Hyun Han1, Kyong-Tai Kim1, Wan Kyun Chung7, Ki Hyun Nam 8,9, Jaehyun Park 10, ByungHoon Lee 11, Sunghoon Kim 12, Weixing Zhao3, Sung Ho Ryu 1, Yun-Sil Lee 4, Kyungjae Myung 2,13 & Yunje Cho1
1Department of Life Sciences, Pohang University of Science and Technology, Pohang, Republic of Korea.
2Center for Genomic Integrity, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea.
3Department of Biochemistry and Structural Biology, University of Texas Health San Antonio, San Antonio, TX 78229, USA.
4Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea.
5Postech Biotech Center, Pohang University of Science and Technology, Pohang, Republic of Korea.
6Department of Oral Biochemistry, School of Dentistry, Pusan National University, Pusan, Republic of Korea.
7Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea.
8Division of Biotechnology, Korea University, Seoul, Republic of Korea.
9Institute of Life Science and Natural Resources, Korea University, Seoul, Republic of Korea.
10Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Republic of Korea.
11Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Republic of Korea.
12Institute for Artificial Intelligence and Biomedical Research, College of Pharmacy, Gangnam Severance Hospital, Yonsei University, Incheon 21983, Republic of Korea.
13Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
Correspondence and requests for materials should be addressed to Kyungjae Myung or Yunje Cho
Abstract
Aminoacyl-tRNA synthetases (ARSs) have evolved to acquire various additional domains. These domains allow ARSs to communicate with other cellular proteins in order to promote non-translational functions. Vertebrate cytoplasmic isoleucyl-tRNA synthetases (IARS1s) have an uncharacterized unique domain, UNE-I. Here, we present the crystal structure of the chicken IARS1 UNE-I complexed with glutamyl-tRNA synthetase 1 (EARS1). UNE-I consists of tandem ubiquitin regulatory X (UBX) domains that interact with a distinct hairpin loop on EARS1 and protect its neighboring proteins in the multi-synthetase complex from degradation. Phosphomimetic mutation of the two serine residues in the hairpin loop releases IARS1 from the complex. IARS1 interacts with BRCA1 in the nucleus, regulates its stability by inhibiting ubiquitylation via the UBX domains, and controls DNA repair function.
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