Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Ma, X(2021). SUMOylation and in vitro SUMOylation assay. Bio-protocol Preprint. bio-protocol.org/prep817.
Ma, X., Yang, T., Luo, Y., Wu, L., Jiang, Y., Song, Z., Pan, T., Liu, B., Liu, G., Liu, J., Yu, F., He, Z., Zhang, W., Yang, J., Liang, L., Guan, Y., Zhang, X., Li, L., Cai, W., Tang, X., Gao, S., Deng, K. and Zhang, H.(2019). TRIM28 promotes HIV-1 latency by SUMOylating CDK9 and inhibiting P-TEFb. eLIFE. DOI: 10.7554/eLife.42426