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. 1996 Mar 5;93(5):2037–2042. doi: 10.1073/pnas.93.5.2037

Characterization of small nontranslated polyadenylylated RNAs in vaccinia virus-infected cells.

C Lu 1, R Bablanian 1
PMCID: PMC39905  PMID: 8700881

Abstract

Host protein synthesis is selectively inhibited in vaccinia virus-infected cells. This inhibition has been associated with the production of a group of small, nontranslated, polyadenylylated RNAs (POLADS) produced during the early part of virus infection. The inhibitory function of POLADS is associated with the poly(A) tail of these small RNAs. To determine the origin of the 5'-ends of POLADS, reverse transcription was performed with POLADS isolated from VV-infected cells at 1 hr and 3.5 hr post infection. The cDNAs of these POLADS were cloned into plasmids (pBS or pBluescript II KS +/-), and their nucleotide composition was determined by DNA sequencing. The results of this investigation show the following: There is no specific gene encoding for POLADS. The 5' ends of POLADS may be derived from either viral or cellular RNAs. Any RNA sequence including tRNAs, small nuclear RNAs and 5'ends of mRNAs can become POLADS if they acquire a poly(A) tail at their 3' ends during infection. This nonspecific polyadenylylation found in vaccinia virus-infected cells is probably conducted by vaccinia virus poly(A)+ polymerase. No consensus sequence is found on the 5' ends of POLADS for polyadenylylation. The 5' ends of POLADS have no direct role in their inhibitory activity of protein synthesis.

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Selected References

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