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. 2010 Jun 24;6(6):e1000965. doi: 10.1371/journal.ppat.1000965

Figure 4. HCMV pUL29/28 is necessary for the HDAC1 interaction with pUL38.

Figure 4

(A) The interaction between pUL38 and HDAC1 requires additional factors present during viral infection. Immunoprecipitation (IP) from whole cell lysates isolated from either uninfected control cells (HF) or pUL38-expressing cells (HF-UL38) using antibodies against HDAC1 (lanes 1, 4) or TSC2 (lane 6). Immunoprecipitation of HDAC1 (lane 5) was also completed upon infection of HF-UL38 cells with a pUL38-deficient virus, BADsubUL38 (subUL38) at 24 hpi. Binding to pUL38 was detected by Western blot (WB) analysis with an anti-pUL38 antibody. Beads without antibody and normal IgG were used as specificity controls (lane 2, 3). (B) pUL38 binding to HDAC1 requires pUL29/28. Cells were infected at 3 pfu/cell using wild-type (BADwt), BADsubUL29 (subUL29) or BADsubUL28 (subUL28) mutant viruses and whole cell lysates collected at 24 hpi. Interactions were detected by immunoprecipitation of HDAC1 and Western blot to pUL38. Lysate controls demonstrate expression of pUL38 in all samples. (C) pUL29 binds HDAC1 in the absence of infection. Expression vectors pCGN or pCGN-pUL29HA (pUL29HA) were transfected into U-2 OS cells and whole cell lysates were collected 48 h later. Binding was demonstrated by immunoprecipitation of HDAC1 and Western blot to HA. Lysate controls show expression of pUL29HA, HDAC1 and tubulin, and an asterisks indicates heavy chain of IgG.