Modification of a loop sequence between alpha-helices 6 and 7 of virus capsid (CA) protein in a human immunodeficiency virus type 1 (HIV-1) derivative that has simian immunodeficiency virus (SIVmac239) vif and CA alpha-helices 4 and 5 loop improves replication in cynomolgus monkey cells.
BACKGROUND
Human immunodeficiency virus type 1 (HIV-1) productively infects only humans and chimpanzees but not cynomolgus or rhesus monkeys while simian immunodeficiency virus isolated from macaque (SIVmac) readily establishes infection in those monkeys. Several HIV-1 and SIVmac chimeric viruses have been constructed in order to develop an animal model for HIV-1 infection. Construction of an HIV-1 derivative which contains sequences of a SIVmac239 loop between alpha-helices 4 and 5 (L4/5) of capsid protein (CA) and the entire SIVmac239 vif gene was previously reported. Although this chimeric virus could grow in cynomolgus monkey cells, it did so much more slowly than did SIVmac. It was also reported that intrinsic TRIM5alpha restricts the post-entry step of HIV-1 replication in rhesus and cynomolgus monkey cells, and we previously demonstrated that a single amino acid in a loop between alpha-helices 6 and 7 (L6/7) of HIV type 2 (HIV-2) CA determines the susceptibility of HIV-2 to cynomolgus monkey TRIM5alpha.


RESULTS
In the study presented here, we replaced L6/7 of HIV-1 CA in addition to L4/5 and vif with the corresponding segments of SIVmac. The resultant HIV-1 derivatives showed enhanced replication capability in established T cell lines as well as in CD8+ cell-depleted primary peripheral blood mononuclear cells from cynomolgus monkey. Compared with the wild type HIV-1 particles, the viral particles produced from a chimeric HIV-1 genome with those two SIVmac loops were less able to saturate the intrinsic restriction in rhesus monkey cells.


CONCLUSIONS
We have succeeded in making the replication of simian-tropic HIV-1 in cynomolgus monkey cells more efficient by introducing into HIV-1 the L6/7 CA loop from SIVmac. It would be of interest to determine whether HIV-1 derivatives with SIVmac CA L4/5 and L6/7 can establish infection of cynomolgus monkeys in vivo.
Kuroishi
Ayumu
A
Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan. kuroishi@biken.osaka-u.ac.jp
Saito
Akatsuki
A
Shingai
Yasuhiro
Y
Shioda
Tatsuo
T
Nomaguchi
Masako
M
Adachi
Akio
A
Akari
Hirofumi
H
Nakayama
Emi E
EE
D000818:Animals; D036022:Capsid Proteins / Q000235:genetics*; D002460:Cell Line; D002478:Cells, Cultured; D015497:HIV-1 / Q000235:genetics* / Q000502:physiology; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000821:virology; D008252:Macaca fascicularis; D011995:Recombination, Genetic; D015302:Simian Immunodeficiency Virus / Q000235:genetics*; D013601:T-Lymphocytes / Q000821:virology; D017361:Viral Nonstructural Proteins / Q000235:genetics*; D014779:Virus Replication
D036022:Capsid Proteins; D017361:Viral Nonstructural Proteins