Please use this identifier to cite or link to this item: https://hdl.handle.net/1783.1/52803
Internally Deleted Human tRNA Synthetase Suggests Evolutionary Pressure for Repurposing
| Author |
Xu, Zhiwen
Wei, Zhiyi Zhou, Jie Ye, Fei Lo, Wing Sze Wang, Feng Lau, Ching Fun Wu, Jingjing Nangle, Leslie A. Chiang, Kyle P. Yang, Xianglei Zhang, Mingjie Schimmel, Paul |
|---|---|
| Issue Date | 2012 |
| Source | Structure, v. 20, (9), September 2012, p. 1470-1477 |
| Abstract | Aminoacyl-tRNA synthetases (AARSs) catalyze aminoacylation of tRNAs in the cytoplasm. Surprisingly, AARSs also have critical extracellular and nuclear functions. Evolutionary pressure for new functions might be manifested by splice variants that skip only an internal catalytic domain (CD) and link noncatalytic N- and C-terminal polypeptides. Using disease-associated histidyl-tRNA synthetase (HisRS) as an example, we found an expressed 171-amino acid protein (HisRS Delta CD) that deleted the entire CD, and joined an N-terminal WHEP to the C-terminal anticodon-binding domain (ABD). X-ray crystallography and three-dimensional NMR revealed the structures of human HisRS and HisRS Delta CD. In contrast to homodimeric HisRS, HisRS Delta CD is monomeric, where rupture of the ABD's packing with CD resulted in a dumbbell-like structure of flexibly linked WHEP and ABD domains. In addition, the ABD of HisRS Delta CD presents a distinct local conformation. This natural internally deleted HisRS suggests evolutionary pressure to reshape AARS tertiary and quaternary structures for repurposing. |
| DOI | 10.1016/j.str.2012.08.001 |
| ISSN | 0969-2126 |
| Language | English |
| Type | Article |
| Access |
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