'Binding, bending and bonding': polypurine tract-primed initiation of plus-strand DNA synthesis in human immunodeficiency virus.
During the course of reverse transcription, human immunodeficiency virus type 1 reverse transcriptase (HIV-1 RT) initiates plus-strand DNA synthesis from two highly conserved, purine-rich RNA segments of the viral genome referred to as the 3' and central polypurine tracts (3' and cPPTs). Processing of these elements occurs in several sequential steps including (1) minus-strand DNA synthesis over the PPT(s), (2) ribonuclease H (RNase H) mediated cleavage at the PPT 3' terminus, (3) plus-strand DNA synthesis from the nascent RNA primer(s), and (4) primer removal. Completing each of these steps precisely and specifically is essential, as failure to do so can result in reduced virus replication and/or impaired integration of viral DNA into the host cell genome. In this review, plus-strand primer processing in HIV-1 is discussed from biochemical, structural, and historical perspectives. A comparative analysis of PPT-processing in different LTR-containing retroelements is also presented.
Rausch
Jason W
JW
Reverse Transcriptase Biochemistry Section, HIV Drug Resistance Program, National Cancer Institute at Frederick, Building 535, Room 325, Frederick, MD 21702, USA.
Le Grice
Stuart F J
SF
D004279:DNA, Viral / Q000096:biosynthesis* / Q000737:chemistry / Q000378:metabolism; D054303:HIV Reverse Transcriptase / Q000235:genetics / Q000378:metabolism; D015497:HIV-1 / Q000235:genetics* / Q000378:metabolism*; D011687:Purines / Q000737:chemistry / Q000378:metabolism*; D016914:Ribonuclease H / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid
D004279:DNA, Viral; D011687:Purines; D054303:HIV Reverse Transcriptase; D016914:Ribonuclease H