Heterogeneous nuclear ribonucleoprotein U-like protein 1 is a protein that in humans is encoded by the HNRNPUL1 gene.

This gene encodes a nuclear RNA-binding protein of the heterogeneous nuclear ribonucleoprotein (hnRNP) family. This protein binds specifically to adenovirus E1B-55kDa oncoprotein. It may play an important role in nucleocytoplasmic RNA transport, and its function is modulated by E1B-55kDa in adenovirus-infected cells. Two transcript variants encoding different isoforms have been found for this gene. Additional variants have also been found, but their full-length natures have not been determined. [provided by RefSeq, Jul 2008].
Function: Acts as a basic transcriptional regulator. Represses basic transcription driven by several virus and cellular promoters. When associated with BRD7, activates transcription of glucocorticoid-responsive promoter in the absence of ligand-stimulation. Plays also a role in mRNA processing and transport. Binds avidly to poly(G) and poly(C) RNA homopolymers in vitro.