4H3S: The crystal structure of Glutaminyl-tRNA Synthetase from Saccharomyces Cerevisia described in the paper entitled “The structure of yeast glutaminyl-tRNA synthetase and modeling of its interaction with tRNA“. This is connected to 3TL4 (an appended domain in eukaryotes). Details are available in “Structural conservation of an ancient tRNA sensor in eukaryotic glutaminyl-tRNA synthetase“.