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J Virol
1997 Nov 01;7111:8096-102. doi: 10.1128/JVI.71.11.8096-8102.1997.
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In vitro binding of purified murine ecotropic retrovirus envelope surface protein to its receptor, MCAT-1.
Davey RA
,
Hamson CA
,
Healey JJ
,
Cunningham JM
.
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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.
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