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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Feb 28;92(5):1362–1366. doi: 10.1073/pnas.92.5.1362

The U3 promoter region of the acutely lethal simian immunodeficiency virus clone smmPBj1.9 confers related biological activity on the apathogenic clone agm3mc.

M T Dittmar 1, K Cichutek 1, P N Fultz 1, R Kurth 1
PMCID: PMC42519  PMID: 7877983

Abstract

Infection with the acutely pathogenic molecular virus clone SIVsmmPBj1.9, cloned from isolate PBj14 of simian immunodeficiency virus (SIV) from sooty mangabey monkeys (Cercocebus atys), leads to acute viral and often lethal disease within days or weeks. SIVsmmPBj1.9 has the unique property of replicating in nonstimulated peripheral blood mononuclear cells from pig-tailed macaques. In contrast, molecular virus clone SIVagm3mc of SIV from African green monkeys (Cercopithecus aethiops), which is apathogenic in its natural host and in pig-tailed macaques, is unable to grow in nonstimulated peripheral blood cells. Chimeric proviruses were constructed by exchanging defined regions of SIVagm3mc against comparable regions of SIVsmmPBj1.9. Four of five hybrid viruses generated by transfection into the CD4-positive T-cell line C8166 replicated in T-cell lines permissive for SIVagm3mc replication and in stimulated peripheral blood cells from pig-tailed macaques and from African green monkeys. Three hybrid viruses displayed the distinct biological property of SIVsmmPBj14 to replicate in nonstimulated peripheral blood cells from pig-tailed macaques and from African green monkeys. Replication in nonstimulated peripheral blood cells was dependent on the presence of the U3 promoter region of SIVsmmPBj1.9 within the viral long terminal repeat.

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Selected References

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