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J. Virol., 11 1997, 8096-8102, Vol 71, No. 11
RA Davey, CA Hamson, JJ Healey and JM Cunningham
An amino-terminal portion of the Friend murine leukemia virus (MLV)
envelope surface protein [SU, residues 1 to 236 [SU:(1-236)]] and its
receptor, MCAT-1, were each purified from insect cells after expression by
using recombinant baculoviruses. Friend SU:(1-236) bound specifically to
Xenopus oocytes that expressed MCAT-1 with an affinity (Kd, 55 nM) similar
to that of viral SU binding to permissive cells. Direct binding of Friend
SU:(1-236) to purified MCAT-1 was observed in detergent and after
reconstitution into liposomes. Analysis of binding demonstrated that MCAT-1
and Friend SU:(1-236) interact with a stoichiometry of near 1:1. These
findings demonstrate that the amino- terminal domain from the SU of
ecotropic murine retroviruses contains an MCAT-1 binding domain.
Copyright © 1997, American Society for Microbiology
In vitro binding of purified murine ecotropic retrovirus envelope surface protein to its receptor, MCAT-1
Howard Hughes Medical Institute, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
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