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• W1497391761 startingPage "6293" @default.
• W1497391761 abstract "ABSTRACT Nonconservative substitutions for Tyr-115 in the reverse transcriptase (RT) of human immunodeficiency virus type 1 (HIV-1) lead to enzymes displaying lower affinity for deoxynucleoside triphosphates (dNTPs) (A. M. Martı́n-Hernández, E. Domingo, and L. Menéndez-Arias, EMBO J. 15:4434–4442, 1996). Several mutations at this position (Y115W, Y115L, Y115A, and Y115D) were introduced in an infectious HIV-1 clone, and the replicative capacity of the mutant viruses was monitored. Y115W was the only mutant able to replicate in MT-4 cells, albeit very poorly. Nucleotide sequence analysis of the progeny virus recovered from supernatants of four independent transfection experiments showed that the Y115W mutation was maintained. However, in all cases an additional substitution in the primer grip of the RT (M230I) emerged when the virus increased its replication capacity. Using recombinant HIV-1 RT, we demonstrate that M230I mitigates the polymerase activity defect of the Y115W mutant, by increasing the dNTP binding affinity of the enzyme. The second-site suppressor effects observed were mediated by mutations in the 66-kDa subunit of the RT, as demonstrated with chimeric heterodimers. Examination of available crystal structures of HIV-1 RT suggests a possible mechanism for restoration of enzyme activity by the second-site revertant." @default.
• W1497391761 created "2016-06-24" @default.
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• W1497391761 date "1999-08-01" @default.
• W1497391761 modified "2023-10-18" @default.
• W1497391761 title "Second-Site Reversion of a Human Immunodeficiency Virus Type 1 Reverse Transcriptase Mutant That Restores Enzyme Function and Replication Capacity" @default.
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• W1497391761 doi "https://doi.org/10.1128/jvi.73.8.6293-6298.1999" @default.
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