Abstract
Eleven in-frame vif gene mutants of HIV type 1 produced in non-permissive cells were examined for their replication potentials in various CD4-positive and -negative cell lines. Virus replication for each mutant was monitored by using several single- and multiple-cycle infectivity assays. Except for a mutant with wild-type phenotype, most mutants were severely defective for replication in all the cell lines as expected from the producer cell-dependent functioning of Vif so far reported. In contrast, two mutants, which have mutations in the hydrophilic or effector regions of Vif were found to have target cell-dependent replication potentials. These results demonstrate the presence of a novel category of the vif mutants important for elucidation of the Vif function.
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