Updated project metadata. Background: The ribosome assembly factors PNO1 and NOB1 play crucial roles in the maturation of the 40S ribosomal small subunit. TurboID is an efficient biotin ligase that can biotinylate proteins in proximity to the target protein and is widely used to study complex biological processes within cells.Here, we utilized this technology to investigate the complex interaction network of PNO1 and NOB1 within cells.