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Helix clamp motifs of polymerases possessing the helix-turn-helix secondary structure are crucial for their polymerase activity by binding to the nucleic acid template/primer via the alpha helices. To study the functions of turn in helix clamp motif of human immunodeficiency virus (HIV)-1 RT, clones with turn mutants at rt271–274 of HIV-1 RT were generated and studied by one cycle infection assay...
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