This is the lysyl-tRNA synthetase binding domain of aminoacyl tRNA synthase complex-interacting multifunctional protein 2 (AIMP2) [1].

1: Structural switch of lysyl-tRNA synthetase between translation and transcription. Ofir-Birin Y, Fang P, Bennett SP, Zhang HM, Wang J, Rachmin I, Shapiro R, Song J, Dagan A, Pozo J, Kim S, Marshall AG, Schimmel P, Yang XL, Nechushtan H, Razin E, Guo M; Mol Cell. 2013;49:30-42. PMID:23159739