1887

Abstract

A highly oncogenic strain of the lymphotropic tumour virus herpesvirus saimiri (HVS; strain 484-77) expresses four small RNAs (HSUR1 to 4) in high copy numbers in transformed T cells. In HSUR1 and HSUR2 the 5′ terminal regions contain conserved AUUUA sequence repeats. The same AUUUA repeats occur in the 3′ noncoding regions of growth factor, lymphokine and protooncogene mRNAs, and the sequence is involved in rapid mRNA degradation. We report here that by using a highly specific u.v. cross-linking method we identified a novel 70K binding factor with AUUUA sequence specificity. Non-radiolabelled competition and V8 protease analysis show that the protein can form a complex with the 3′ non-coding region of interleukin-4 mRNA and bind the AUUUA repeats of a HVS small RNA. We also detected an AUUUA-specific minor 32K human protein with the same electrophoretic mobility as a marmoset factor implicated in growth factor mRNA destabilization. The findings are consistent with the hypothesis that the viral small RNAs can compete for factors involved in rapid degradation of growth factor mRNAs and may contribute to viral oncogenesis.

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1994-09-01
2022-05-28
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