4l87
Crystal structure of the human seryl-tRNA synthetase in complex with Ser-SA at 2.9 Angstrom resolutionCrystal structure of the human seryl-tRNA synthetase in complex with Ser-SA at 2.9 Angstrom resolution
Structural highlights
FunctionSYSC_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 PubMedSeryl-tRNA synthetase (SerRS), an essential enzyme for translation, also regulates vascular development. This "gain-of-function" has been linked to the UNE-S domain added to vertebrate SerRS during evolution. However, the significance of two insertions also specific to higher eukaryotic SerRS remains elusive. Here, we determined the crystal structure of human SerRS in complex with Ser-SA, an aminoacylation reaction intermediate analog, at 2.9 A resolution. Despite a 70 A distance, binding of Ser-SA in the catalytic domain dramatically leverages the position of Insertion I in the tRNA binding domain. Importantly, this leverage is specific to higher eukaryotes and not seen in bacterial, archaeal, and lower eukaryotic SerRSs. Deletion of Insertion I does not affect tRNA binding but instead reduce the catalytic efficiency of the synthetase. Thus, a long-range conformational and functional communication specific to higher eukaryotes is found in human SerRS, possibly to coordinate translation with vasculogenesis. Crystal Structure of Human Seryl-tRNA Synthetase and Ser-SA Complex Reveals a Molecular Lever Specific to Higher Eukaryotes.,Xu X, Shi Y, Yang XL Structure. 2013 Oct 1. pii: S0969-2126(13)00342-0. doi:, 10.1016/j.str.2013.08.021. PMID:24095058[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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