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A Cellular Cofactor for the Constitutive Transport Element of Type D Retrovirus

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Science  30 May 1997:
Vol. 276, Issue 5317, pp. 1412-1415
DOI: 10.1126/science.276.5317.1412

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Abstract

A human nuclear protein that specifically interacts with the constitutive transport element (CTE) of simian retrovirus was identified as adenosine 5′-triphosphate–dependent RNA helicase A. This protein could bind to functional CTE but not to inactive CTE mutants. The interaction of helicase A with CTE was distinct from previously described helicase activity of this protein. Helicase A shuttled from the nucleus to the cytoplasm in the presence of a transcription inhibitor or in cells transiently overexpressing CTE-containing RNA. In vivo colocalization of helicase A and CTE was observed in experiments that combined in situ hybridization and immunostaining. These results suggest that helicase A plays a role in the nuclear export of CTE-containing RNA.

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