Multiple roles for Puralpha in cellular and viral regulation

Cell Cycle. 2009 Feb 1;8(3):1-7. doi: 10.4161/cc.8.3.7585. Epub 2009 Feb 10.


Pur-alpha is a ubiquitous multifunctional protein that is strongly conserved throughout evolution, binds to both DNA and RNA and functions in the initiation of DNA replication, control of transcription and mRNA translation. In addition, it binds to several cellular regulatory proteins including the retinoblastoma protein, E2F-1, Sp1, YB-1, cyclin T1/Cdk9 and cyclin A/Cdk2. These observations and functional studies provide evidence that Puralpha is a major player in the regulation of the cell cycle and oncogenic transformation. Puralpha also binds to viral proteins such as the large T-antigen of JC virus (JCV) and the Tat protein of human immunodeficiency virus-1 (HIV-1) and plays a role in the cross-communication of these viruses in the opportunistic polyomavirus JC (JCV) brain infection, progressive multifocal leukoencephalopathy (PML). The creation of transgenic mice with inactivation of the PURA gene that encodes Puralpha has revealed that Puralpha is critical for postnatal brain development and has unraveled an essential role of Puralpha in the transport of specific mRNAs to the dendrites and the establishment of the postsynaptic compartment in the developing neurons. Finally, the availability of cell cultures from the PURA knockout mice has allowed studies that have unraveled a role for Puralpha in DNA repair.

Publication types

  • Review

MeSH terms

  • Acquired Immunodeficiency Syndrome / complications
  • Animals
  • Brain / growth & development
  • Cell Cycle / physiology
  • Cell Transformation, Neoplastic
  • DNA Repair
  • DNA-Binding Proteins / chemistry
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism*
  • Gene Products, tat / genetics
  • Gene Products, tat / metabolism
  • Humans
  • JC Virus / genetics
  • JC Virus / metabolism
  • Leukoencephalopathy, Progressive Multifocal / etiology
  • Leukoencephalopathy, Progressive Multifocal / physiopathology
  • Neoplasms / metabolism*
  • Neoplasms / physiopathology
  • Protein Biosynthesis
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Transcription Factors / chemistry
  • Transcription Factors / genetics
  • Transcription Factors / metabolism*


  • DNA-Binding Proteins
  • Gene Products, tat
  • PURA protein, human
  • RNA, Messenger
  • Transcription Factors