Mutations in human immunodeficiency virus type 1 nucleocapsid protein zinc fingers cause premature reverse transcription.

Abstract:

:Human immunodeficiency virus type 1 (HIV-1) requires that its genome be reverse transcribed into double-stranded DNA for productive infection of cells. This process requires not only reverse transcriptase but also the nucleocapsid protein (NC), which functions as a nucleic acid chaperone. Reverse transcription generally begins once the core of the virion enters the cytoplasm of a newly infected cell. However, some groups have reported the presence of low levels of viral DNA (vDNA) within particles prior to infection, the significance and function of which is controversial. We report here that several HIV-1 NC mutants, which we previously identified as being replication defective, contain abnormally high levels of intravirion DNA. These findings were further reinforced by the inability of these NC mutants to perform endogenous reverse transcription (ERT), in contrast to the readily measurable ERT activity in wild-type HIV-1. When either of the NC mutations is combined with a mutation that inactivates the viral protease, we observed a significant reduction in the amount of intravirion DNA. Interestingly, we also observed high levels of intravirion DNA in the context of wild-type NC when we delayed budding by means of a PTAP((-)) (Pro-Thr-Ala-Pro) mutation. Premature reverse transcription is most probably occurring before these mutant virions bud from producer cells, but we fail to see any evidence that the NC mutations alter the timing of Pr55(Gag) processing. Critically, our results also suggest that the presence of intravirion vDNA could serve as a diagnostic for identifying replication-defective HIV-1.

journal_name

J Virol

journal_title

Journal of virology

authors

Thomas JA,Bosche WJ,Shatzer TL,Johnson DG,Gorelick RJ

doi

10.1128/JVI.00583-08

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

9318-28

issue

19

eissn

0022-538X

issn

1098-5514

pii

JVI.00583-08

journal_volume

82

pub_type

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