p38/JTV-1 is a scaffold required for the assembly and stability of the multi-tRNA synthetase complex, an essential enzyme that ligates specific amino acids to tRNAs before protein synthesis. It plays a pivotal role in the control of cell proliferation and has been shown to interact with FUSE binding protein, stimulating its ubquitination and degradation and leading to the down-regulation of the transcription factor c-Myc which is required for differentiation of functional alveolar type II cells. Genetic disruption of p38/JTV-1 in mice has been observed to cause neonatal lethality.

p38/JTV-1 is ubiquitinated by the E3 ligase Parkin, leading to its proteosomal degradation. It has been shown to accumulate in Parkin-deficient mice and in the brain tissue of patients with hereditary Parkinson’s, suggesting that it may play a role in the pathogenicity of this disease.

Ubiquitination Cascade Comoponent: Substrate

Purified using immobilized metal affinity chromatography.

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