Required for 40S ribosome biogenesis. Involved in nucleolar processing of pre-18S ribosomal RNA and ribosome assembly (By similarity). Component of the ribosomal small subunit (SSU) processome (By similarity). Directly interacts with HIV-1 protein VPR. Also identified in a complex with NR3C1 and HIV-1 protein VPR. Translocates from cytoplasm to nucleus after exposure to HIV-1 virus or HIV-1 protein VPR or induction by hydrocortisone and dexamethasone in the absence of HIV-1 protein VPR (Ref.6). Belongs to the KRR1 family. Contaminating sequence. Potential poly-A sequence.