E3 ubiquitin protein ligase RNF31 is present in human proteins and is involved in linear ubiquitin chain assembly complex (LUBAC) activity and cell growth. RNF31 is involved in ubiquitination, which is the post-translational modification of proteins. Ubiquitin molecules connect with amino acid residues of target proteins under the action of ubiquitin-activating enzyme E1, ubiquitin binding enzyme E2 and ubiquitin ligase E3, so as to achieve certain physiological functions. The abnormal expression of ubiquitination promotes the formation of cancer. In studies of breast cancer, RNF31 mRNA levels were found to be higher in cancer cells than in other tissues. The PUB domain of RNF31 is the binding site of the ubiquitin thioesterase otulin. Here, we report the backbone and side-chain resonance assignments of the PUB domain of RNF31 and study the backbone relaxation of the domain. These studies will contribute to further understanding of the structural and functional relationship of RNF31 protein, which may also be a target for drug research.
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