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J. Virol., 01 1998, 428-435, Vol 72, No. 1
JL Battini, O Danos and JM Heard
Hydrophilic loops in the receptor binding domain of the amphotropic murine
leukemia virus (MLV) envelope glycoprotein (SU) are predicted and may
participate in SU-receptor interactions. We have replaced five segments of
6 to 15 amino acids located in each of these regions with an 11-amino-acid
tag from the vesicular stomatitis virus glycoprotein (VSV-G). Substitution
was compatible with envelope processing, transport, and incorporation into
virions. However, three substitution mutants showed a temperature-dependent
phenotype, suggesting structural unstability. Accessibility of the tagging
epitope for a monoclonal anti- VSV-G antibody was greater in oligomeric
than in monomeric SUs when insertion was done in VRA, a domain essential
for receptor recognition. In contrast, accessibility was independent of
structural constraints when insertion was done in VRB, a domain playing an
accessory role in receptor binding. Interaction with the amphotropic
receptor was investigated by interference assay and study of binding and
infection of target cells with MLV particles coated with the substituted
envelopes. Envelope-receptor interaction was abolished when substitution
was performed in a potential loop-forming segment located at the N-terminal
half of VRA. Although interaction was affected to variable extents,
depending on the substituted segment, other mutants conserved the ability
to interact with the amphotropic receptor. These experiments indicate the
14-amino-acid segment between positions 50 and 64 of SU as an essential
determinant of amphotropic-receptor recognition. They also show that a
foreign linear epitope can be tolerated in several locations of the
amphotropic SU receptor binding site, and this result has implications for
the design of targeted retroviral vectors.
Copyright © 1998, American Society for Microbiology
Definition of a 14-amino-acid peptide essential for the interaction between the murine leukemia virus amphotropic envelope glycoprotein and its receptor
Laboratoire Retrovirus et Transfert Genetique, CNRS URA 1157, Institut Pasteur, Paris, France.
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