Human antigen R (HuR) is a ubiquitous protein that recognizes adenylate and uridylate-rich elements in mRNA, thereby interfering with the fate of protein translation. This protein plays a central role in the outcome of the inflammatory response as it may stabilize or silence mRNAs of key components of the immune system. HuR is able to interact with other RNA-binding proteins, reflecting a complex network that dictates mRNAs post-transcriptional control. HuR is composed of three functional domains, known as RNA-recognition motifs (RRM1, RRM2 and RRM3). It is known that RRM1 is the most important domain for mRNA-binding affinity. In this study, we completed the NMR chemical shift assignment of the RRM1 domain of HuR, as a first step to further establishing the structure, dynamics and function relationship for this protein.