SEQUENCE NOTE Analysis of HIV Type 1 gp41 and Enfuvirtide Susceptibility among Men in the United States Who Were HIV Infected Prior to Availability of HIV Entry Inhibitors

We analyzed HIV gp41 from 195 men in the United States who were HIV-1 infected between 1999 and 2002, before enfuvirtide (ENF) was approved for clinical use in the United States. gp41 genotyping results were obtained for 175 samples. None of the samples had major ENF resistance mutations. Six (3.4%) samples had minor ENF resistance mutations in the HR1 region (V38G, N43K, L44M, L45M). Twenty-eight (16%) samples had the N42S polymorphism, which is associated with ENF hypersusceptibility. Accessory mutations in the HR2 region were identified in some samples (E137K, S138A). Five of the six samples with HR1 resistance mutations were analyzed with a phenotypic assay; one sample had reduced ENF susceptibility (a sample with N42Sþ L44MþE137K). Prior to the availability of ENF, some men in the United States were infected with HIV that contained mutations associated with ENF resistance or hypersusceptibility. However, most of the mutations were not associated with phenotypic ENF resistance. The HIV envelope glycoproteins gp120 and gp41 in-teract with cell surface proteins to mediate entry of HIV into target cells. The ectodomain of gp41 contains two highly conserved heptad repeat domains, HR1 and HR2. These domains interact to form a six-helix bundle that is critical for viral fusion.1,2 In 2003, the United States Food and Drug Administration (FDA) licensed the first HIV fusion inhibitor