title: Modulation of HIV-1 reverse transcriptase function in "selectively deleted" p66/p51 heterodimers.
abstract: A contribution of the 51-kDa subunit of human immunodeficiency virus type-1 reverse transcriptase to activities of the parental heterodimer (p66/p51) was assessed in "selectively deleted" heterodimers whose p51 component contained C-terminal truncations of 13, 19, or 25 residues. Analyses included (i) efficiency of reconstitution into heterodimer, (ii) retention of polymerase and ribonuclease H (RNase H) function, and (iii) interaction with the HIV replication primer, tRNA(Lys,3). Our data suggest that these features of heterodimer reverse transcriptase can be modulated by the extent of the C-terminal p51 deletion. Severely impaired tRNA binding in a selectively deleted heterodimer whose 51-kDa subunit lacks 13 residues, despite retention of enzymatic functions, strengthens arguments for p51 involvement in tRNA binding.
authors.affiliation: Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106.
authors.forename: P S
authors.initials: PS
authors.lastname: Jacques
authors.forename: B M
authors.initials: BM
authors.lastname: Wöhrl
authors.forename: K J
authors.initials: KJ
authors.lastname: Howard
authors.forename: S F
authors.initials: SF
authors.lastname: Le Grice
mesh_terms: D000595:Amino Acid Sequence; D004259:DNA-Directed DNA Polymerase / Q000737:chemistry; D054303:HIV Reverse Transcriptase; D015497:HIV-1 / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016297:Mutagenesis, Site-Directed; D012343:RNA, Transfer / Q000378:metabolism; D012194:RNA-Directed DNA Polymerase / Q000737:chemistry* / Q000378:metabolism; D016914:Ribonuclease H / Q000737:chemistry; D017384:Sequence Deletion; D013329:Structure-Activity Relationship
chemical_list: D012343:RNA, Transfer; D054303:HIV Reverse Transcriptase; D012194:RNA-Directed DNA Polymerase; D004259:DNA-Directed DNA Polymerase; D016914:Ribonuclease H