3vbb
From Proteopedia
Crystal Structure of Seryl-tRNA Synthetase from Human at 2.9 angstroms
Structural highlights
Function[SYSC_HUMAN] Catalyzes the attachment of serine to tRNA(Ser). Is also probably able to aminoacylate tRNA(Sec) with serine, to form the misacylated tRNA L-seryl-tRNA(Sec), which will be further converted into selenocysteinyl-tRNA(Sec).[1] Publication Abstract from PubMedNew domains were progressively added to cytoplasmic aminoacyl transfer RNA (tRNA) synthetases during evolution. One example is the UNE-S domain, appended to seryl-tRNA synthetase (SerRS) in species that developed closed circulatory systems. Here we show using solution and crystal structure analyses and in vitro and in vivo functional studies that UNE-S harbours a robust nuclear localization signal (NLS) directing SerRS to the nucleus where it attenuates vascular endothelial growth factor A expression. We also show that SerRS mutants previously linked to vasculature abnormalities either deleted the NLS or have the NLS sequestered in an alternative conformation. A structure-based second-site mutation, designed to release the sequestered NLS, restored normal vasculature. Thus, the essential function of SerRS in vascular development depends on UNE-S. These results are the first to show an essential role for a tRNA synthetase-associated appended domain at the organism level, and suggest that acquisition of UNE-S has a role in the establishment of the closed circulatory systems of vertebrates. Unique domain appended to vertebrate tRNA synthetase is essential for vascular development.,Xu X, Shi Y, Zhang HM, Swindell EC, Marshall AG, Guo M, Kishi S, Yang XL Nat Commun. 2012 Feb 21;3:681. doi: 10.1038/ncomms1686. PMID:22353712[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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