This is a thioredoxin like domain found in AIMP2 proteins (Aminoacyl tRNA synthetase complex interacting multifunctional protein 2). Aimp2 is a component of human multi-tRNA synthetase complex (MSC). MSC is a macromolecular protein complex consisting of nine different ARSs and three ARS-interacting multifunctional proteins (AIMPs) [1].

1: Assembly of Multi-tRNA Synthetase Complex via Heterotetrameric Glutathione Transferase-homology Domains. Cho HY, Maeng SJ, Cho HJ, Choi YS, Chung JM, Lee S, Kim HK, Kim JH, Eom CY, Kim YG, Guo M, Jung HS, Kang BS, Kim S; J Biol Chem. 2015;290:29313-29328. PMID:26472928