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Lin, G.Y. et al.

The V protein of the paramyxovirus SV5 interacts with damage-specific DNA binding protein.

The simian parainfluenza virus 5 (SV5) V/P gene encodes two proteins: V and the phosphoprotein P. The V and P proteins are amino coterminal for 164 residues, but they have unique carboxyl termini. The unique carboxyl terminus of V contains seven cysteine residues, resembles a zinc finger, and binds two atoms of zinc. In a glutathione-S-transferase (GST)-fusion protein selection of cell lysate assay, the GST-V protein was found to interact with the 127-kDa subunit (DDB1) of the damage-specific DNA binding protein (DDB) [also known as UV-damaged DNA binding protein (UV-DDB), xeroderma pigmentosum group E binding factor (XPE-BF), and the hepatitis B virus X-associated protein 1 (XAP-1)]. A reciprocal GST-DDB1 fusion protein selection assay of SV5-infected cell lysates showed that DDB1 and V interact, and it was found that V and DDB1 could be coimmunoprecipitated from SV5-infected cells or from cells expressing V and DDB1 using the vaccinia virus T7 expression system. The interaction of V and DDB1 involves the carboxyl-terminal domain of V in that either deletion of the V carboxyl-terminal domain or substitution of the cysteine residues (C189, C193, C205, C207, C210, C214, and C217) in the zinc-binding domain with alanine was able to disrupt binding to DDB1. The V proteins of the mumps virus, human parainfluenza virus 2 (hPIV2), and measles virus have also been found to interact with DDB1 in GST-fusion protein selection assays using in vitro transcribed and translated DDB1.[1]

References

The V protein of the paramyxovirus SV5 interacts with damage-specific DNA binding protein. Lin, G.Y., Paterson, R.G., Richardson, C.D., Lamb, R.A. Virology (1998) [Pubmed]

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