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The Carboxyl-Terminus of Human Immunodeficiency Virus Type 2 Circulating Recombinant form 01_AB Capsid Protein Affects Sensitivity to Human TRIM5a
Published: Friday, October 19, 2012
Author: Tadashi Miyamoto et al.

by Tadashi Miyamoto, Emi E. Nakayama, Masaru Yokoyama, Shiro Ibe, Shunpei Takehara, Ken Kono, Yoshiyuki Yokomaku, Massimo Pizzato, Jeremy Luban, Wataru Sugiura, Hironori Sato, Tatsuo Shioda

Human immunodeficiency virus (HIV) type 2 shows limited geographical distribution compared with HIV type 1. Although 8 genetic groups of HIV type 2 (HIV-2) have been described, recombinant viruses between these groups are rarely observed. Recently, three HIV-2 patients in Japan were described with rapidly progressive, acquired immunodeficiency. These patients were infected with an A/B inter-group recombinant designated CRF01_AB. Here, we characterize the capsid protein (CA) encoded by the viruses from these patients. HIV-2 CRF01_AB CA showed unique amino acid sequence almost equally distinct from group A and group B viruses. Notably, HIV-2 CRF01_AB CA showed potent resistance to human TRIM5a. In addition to the previously identified amino acid position 119 in the N-terminal domain of CA, we found that HIV-2 CRF01_AB-specific amino acid substitutions in the C-terminal domain also were necessary for resistance to human TRIM5a. These results indicate that retroviruses can evade TRIM5a by substitution at residues within the C-terminal domain of CA.