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Your search keyword '"Levin, Judith G."' showing total 19 results
Start Over Author "Levin, Judith G." Journal journal of virology
19 results on '"Levin, Judith G."'

6. Actinomycin D Induces High-Level Resistance to Thymidine Analogs in Replication of Human Immunodeficiency Virus Type 1 by Interfering with Host Cell Thymidine Kinase Expression

Author

Imamichi, Tomozumi, primary, Murphy, Michael A., additional, Adelsberger, Joseph W., additional, Yang, Jun, additional, Watkins, Catherine M., additional, Berg, Steve C., additional, Baseler, Michael W., additional, Lempicki, Richard A., additional, Guo, Jianhui, additional, Levin, Judith G., additional, and Lane, H. Clifford, additional

Published
2003
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19. Human Immunodeficiency Virus Type 1 N-Terminal Capsid Mutants Containing Cores with Abnormally High Levels of Capsid Protein and Virtually No Reverse Transcriptase.

Author

Shixing Tang, Robert, Murakami, Tsutomu, Naiqian Cheng, Steven, Alasdair C., Freed, Eric O., and Levin, Judith G.

Subjects
*HIV, *VIRAL proteins, *GENETIC mutation
Abstract

We previously described the phenotype associated with three alanine substitution mutations in conserved residues (Trp23, Phe40, and Asp51) in the N-terminal domain of human immunodeficiency virus type 1 capsid protein (CA). All of the mutants produce noninfectious virions that lack conical cores and, despite having a functional reverse transcriptase (RT), are unable to initiate reverse transcription in vivo. Here, we have focused on elucidating the mechanism by which these CA mutations disrupt virus infectivity. We also report that cyclophilin A packaging is severely reduced in W23A and F40A virions, even though these residues are distant from the cyclophilin A binding loop. To correlate loss of infectivity with a possible defect in an early event preceding reverse transcription, we modeled disassembly by generating viral cores from particles treated with mild nonionic detergent; cores were isolated by sedimentation in sucrose density gradients. In general, fractions containing mutant cores exhibited a normal protein profile. However, there were two striking differences from the wild-type pattern: mutant core fractions displayed a marked deficiency in RT protein and enzymatic activity (<5% of total RT in gradient fractions) and a substantial increase in the retention of CA. The high level of core-associated CA suggests that mutant cores may be unable to undergo proper disassembly. Thus, taken together with the almost complete absence of RT in mutant cores, these findings can account for the failure of the three CA mutants to synthesize viral DNA following virus entry into cells. [ABSTRACT FROM AUTHOR]

Published
2003
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