The receptor complex associated with human T-cell lymphotropic virus type 3 (HTLV-3) Env-mediated binding and entry is distinct from, but overlaps with, the receptor complexes of HTLV-1 and HTLV-2.

Abstract:

:Little is known about the transmission or tropism of the newly discovered human retrovirus, human T-cell lymphotropic virus type 3 (HTLV-3). Here, we examine the entry requirements of HTLV-3 using independently expressed Env proteins. We observed that HTLV-3 surface glycoprotein (SU) binds efficiently to both activated CD4(+) and CD8(+) T cells. This contrasts with both HTLV-1 SU, which primarily binds to activated CD4(+) T cells, and HTLV-2 SU, which primarily binds to activated CD8(+) T cells. Binding studies with heparan sulfate proteoglycans (HSPGs) and neuropilin-1 (NRP-1), two molecules important for HTLV-1 entry, revealed that these molecules also enhance HTLV-3 SU binding. However, unlike HTLV-1 SU, HTLV-3 SU can bind efficiently in the absence of both HSPGs and NRP-1. Studies of entry performed with HTLV-3 Env-pseudotyped viruses together with SU binding studies revealed that, for HTLV-1, glucose transporter 1 (GLUT-1) functions at a postbinding step during HTLV-3 Env-mediated entry. Further studies revealed that HTLV-3 SU binds efficiently to naive CD4(+) T cells, which do not bind either HTLV-1 or HTLV-2 SU and do not express detectable levels of HSPGs, NRP-1, and GLUT-1. These results indicate that the complex of receptor molecules used by HTLV-3 to bind to primary T lymphocytes differs from that of both HTLV-1 and HTLV-2.

journal_name

J Virol

journal_title

Journal of virology

authors

Jones KS,Huang YK,Chevalier SA,Afonso PV,Petrow-Sadowski C,Bertolette DC,Gessain A,Ruscetti FW,Mahieux R

doi

10.1128/JVI.02285-08

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

5244-55

issue

10

eissn

0022-538X

issn

1098-5514

pii

JVI.02285-08

journal_volume

83

pub_type

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