期刊
NUCLEIC ACIDS RESEARCH
卷 46, 期 22, 页码 12166-12176出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gky970
关键词
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资金
- Ministry of Science and Technology, Taiwan, ROC [MOST103-2311-B-009-001-MY3, MOST 106-2311-B-009-002, MOST 107-2628-B-009-001]
- Ministry of Education through the SPROUT Project-Center For Intelligent Drug Systems and Smart Bio-devices (IDS2B) of National Chiao Tung University, Taiwan, ROC
- National Core Facility Program for Biotechnology
The three prime repair exonuclease 2 (TREX2) is an essential 3'- to-5' exonuclease that functions in cell proliferation, genome integrity and skin homeostasis maintenance. The abnormal expression level of TREX2 can result in broken chromosome, increased susceptibility to skin carcinogenesis and Psoriasis. However, the molecular mechanisms of how TREX2 binds and processes its natural substrates, dsDNA or chromosomal DNA, to maintain genome stability remain unclear. In this study, we present four new crystal structures: apo-TREX2, TREX2 in complex with two different dsDNA substrates, and TREX2 in complex with a processed dsDNA product. Analysis of the structures reveals that TREX2 stacks with the 5'-terminal of dsDNA by a Leu20-Pro21-Asn22 cluster for precisely trimming the 3'-overhang. In addition, TREX2 specifically interacts with the nonscissile strand of dsDNA by an alpha-helix-loop region. The unique interaction patterns of the TREX2-dsDNA complex highlight the requirement of long double-stranded region for TREX2 binding and provide evidence of the functional role of TREX2 in processing chromosomal DNA. Moreover, the non-processive property of TREX2 is elucidated by the structure of TREX2-product complex. Our work discloses the first structural basis of the molecular interactions between TREX2 and its substrates and unravels the mechanistic actions of TREX2.
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