AIMP2 (aminoacyl tRNA synthetase complex interacting multifunctional protein 2) serves as a critical scaffold protein in the multi-tRNA synthetase complex (MSC) and functions as a tumor suppressor with diverse cellular roles. As a non-enzymatic component of the MSC, AIMP2 is essential for complex assembly and stability, utilizing leucine zipper motifs to form heterotrimeric complexes with RARS1 and AIMP1 within the 1.5 million Dalton human MSC 12. Beyond protein synthesis, AIMP2 exhibits crucial tumor suppressor functions by stabilizing p53 through prevention of MDM2-mediated degradation and inducing apoptosis in response to DNA damage 3. The protein also regulates RNA editing by enhancing degradation of ADAR proteins in muscle tissues 4. Disease relevance includes hypomyelinating leukodystrophy 17 (HLD17), caused by biallelic loss-of-function mutations in AIMP2 5. An alternatively spliced variant, AIMP2-DX2, lacks exon 2 and acts as an oncogenic factor by competing with full-length AIMP2 for target binding, particularly in lung cancers where it can be induced by nicotine 36. Clinical significance includes potential roles in Parkinson's disease pathogenesis and cancer therapeutics targeting the DX2 variant 7.