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1 Archivum Immunologiae et Therapiae Experimentalis

1 2003

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Viruses as hijackers of PML nuclear body

100%

Moller A. , Schmitz M. L.

nr 5

295-300

Promyelocytic leukemia nuclear bodies (PML-NBs) are discrete interchromosomal macromolecular structures. The integrity of this dynamic nuclear subcompartment critically depends on the presence of the name-giving PML protein. Among the permanent or transient residents of PML-NBs are various regulatory proteins, including Sp100, CBP, pRb, HIPK2, RAD51 and p53. PML-NBs are frequently targeted by viral infections, as a number of different RNA and DNA viruses including herpesviruses, adenoviruses, papovaviruses, papillomaviruses and arenaviruses cause changes in PML-NBs. Viruses interfere with PML-NB in two ways: 1) some viral proteins can associate with PML-NB proteins and/or lead to the destruction and lysis of this subnuclear compartment, thus aiding viral gene expression and disabling the host's innate immunity; 2) the parental genomes of some nuclear-replicating DNA viruses associate preferentially with PML-NBs, which presumably serves to assist in viral gene expression or replication. Here we feature the different viral strategies leading to the hijacking of PML-NBs and discuss the consequences for the immune response.