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J Virol, April 1998, p. 3066-3071, Vol. 72, No. 4
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
A Novel Membrane Protein Is a Mouse Mammary
Tumor Virus Receptor
Tatyana V.
Golovkina,1,
John
Dzuris,1
Bernadette
van
den Hoogen,1
Aron B.
Jaffe,1
Paul C.
Wright,2
Shelagh M.
Cofer,2 and
Susan
R.
Ross1,*
Department of Microbiology/Cancer Center,
University of Pennsylvania, Philadelphia, Pennsylvania
19104-6142,1 and
Department of
Biochemistry, University of Illinois School of Medicine, Chicago,
Illinois 606122
Received 1 August 1997/Accepted 23 December 1997
Mouse mammary tumor virus (MMTV) infects a number of different cell
types, including mammary gland and lymphoid cells, in vivo. To identify
the cellular receptor for this virus, a mouse cDNA expression
library was transfected into Cos-7 monkey kidney cells, and those
transfected cells able to bind virus were selected by using antibody
against the virus's cell surface envelope protein, gp52. One clone
isolated from a library prepared from newborn thymus RNA, called MTVR,
was able to confer virus binding to both monkey and human cells; this
binding was blocked by anti-MTVR antibody. Moreover, transfection of
MTVR into CV1 cells rendered them susceptible to infection by a murine
leukemia virus-based retrovirus vector pseudotyped with the MMTV
envelope protein. An epitope-tagged MTVR cofractionated with cellular
membranes. Coimmunoprecipitation of the MMTV envelope protein and a
MTVR-rabbit Fc fusion protein showed that these two proteins bound to
each other. The MTVR sequence clone is unique, shows no homology to known membrane proteins, and is transcribed in many tissues.
*
Corresponding author. Mailing address: Department of
Microbiology/Cancer Center, University of Pennsylvania, 526 CRB, 415 Curie Blvd., Philadelphia, PA 19104-6142. Phone: (215) 898-9764. Fax:
(215) 573-2028. E-mail: rosss{at}mail.med.upenn.edu.

Present address: The Jackson Laboratory, Bar Harbor, Maine.
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