Abstract
A series of human immunodeficiency virus type 1 (HIV-1) proviralgaggene mutants carrying bacterial CAT gene were constructed and monitored for the expression of reverse transcriptase and CAT in a highly sensitive single-round replication assay system to determine the defective replication phase in lymphocytic cells. All the mutants displayed no abnormality in the process of transcription and translation at late replication stage. In contrast, some matrix, capsid, and p6 mutants were defective at final phase, that is, assembly and virion release. Most of the mutants including nucleocapsid mutants, which showed normal phenotype at late stage, were defective at early replication phase. From the functional domain map thus obtained, it is evident that HIV-1 Gag proteins are required for both early and late replication phases.
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