Structures of HIV-1 RT-RNA/DNA ternary complexes with dATP and nevirapine reveal conformational flexibility of RNA/DNA: insights into requirements for RNase H cleavage.Das, K., Martinez, S.E., Bandwar, R.P., Arnold, E.
(2014) Nucleic Acids Res. 42: 8125-8137
- PubMed: 24880687
- DOI: 10.1093/nar/gku487
- Primary Citation of Related Structures:
- Also Cited By: 4R5P
- PubMed Abstract:
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Tu, X.,Das, K.,Han, Q.,Bauman, J.D.,Clark, A.D.,Hou, X.,Frenkel, Y.V.,Gaffney, B.L.,Jones, R.A.,Boyer, P.L.,Hughes, S.H.,Sarafianos, S.G.,Arnold, E.
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Das, K.,Martinez, S.E.,Bauman, J.D.,Arnold, E.
(2012) Nat.Struct.Mol.Biol. 19: 253
In synthesizing a double-stranded DNA from viral RNA, HIV-1 reverse transcriptase (RT) generates an RNA/DNA intermediate. RT also degrades the RNA strand and synthesizes the second DNA strand. The RNase H active site of RT functions as a nuclease to ...
In synthesizing a double-stranded DNA from viral RNA, HIV-1 reverse transcriptase (RT) generates an RNA/DNA intermediate. RT also degrades the RNA strand and synthesizes the second DNA strand. The RNase H active site of RT functions as a nuclease to cleave the RNA strand; however, the structural basis for endonucleolytic cleavage of the RNA strand remains elusive. Here we report crystal structures of RT-RNA/DNA-dATP and RT-RNA/DNA-nevirapine (NVP) ternary complexes at 2.5 and 2.9 Å resolution, respectively. The polymerase region of RT-RNA/DNA-dATP complex resembles DNA/DNA ternary complexes apart from additional interactions of 2'-OH groups of the RNA strand. The conformation and binding of RNA/DNA deviates significantly after the seventh nucleotide versus a DNA/DNA substrate. Binding of NVP slides the RNA/DNA non-uniformly over RT, and the RNA strand moves closer to the RNase H active site. Two additional structures, one containing a gapped RNA and another a bulged RNA, reveal that conformational changes of an RNA/DNA and increased interactions with the RNase H domain, including the interaction of a 2'-OH with N474, help to position the RNA nearer to the active site. The structures and existing biochemical data suggest a nucleic acid conformation-induced mechanism for guiding cleavage of the RNA strand.
Center for Advanced Biotechnology and Medicine, Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA.