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Journal of Virology, August 1999, p. 6759-6768, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Structure of Adenovirus Complexed with Its
Internalization Receptor,
v
5 Integrin
Charles Y.
Chiu,1
Patricia
Mathias,2
Glen R.
Nemerow,2,* and
Phoebe L.
Stewart1,*
Department of Molecular and Medical
Pharmacology, Crump Institute for Biological Imaging, University of
California
Los Angeles School of Medicine, Los Angeles, California
90095,1 and Department of
Immunology, The Scripps Research Institute, La Jolla, California
920372
Received 19 February 1999/Accepted 21 April 1999
The three-dimensional structure of soluble recombinant integrin
v
5 bound to human adenovirus types 2 and 12 (Ad2 and
-12) has been determined at ~21-Å resolution by cryoelectron
microscopy (cryo-EM). The
v
5 integrin is known to
promote Ad cell entry. Cryo-EM has shown that the integrin-binding RGD
(Arg-Gly-Asp) protrusion of the Ad2 penton base protein is highly
mobile (P. L. Stewart, C. Y. Chiu, S. Huang, T. Muir, Y. Zhao, B. Chait, P. Mathias, and G. R. Nemerow, EMBO J. 16:1189-1198, 1997). Sequence analysis indicated that the Ad12 RGD
surface loop is shorter than that of Ad2 and probably less flexible,
hence more suitable for structural characterization of the Ad-integrin
complex. The cryo-EM structures of the two virus-receptor complexes
revealed a ring of integrin density above the penton base of each virus
serotype. As expected, the integrin density in the Ad2 complex was
diffuse while that in the Ad12 complex was better defined. The integrin consists of two discrete subdomains, a globular domain with an RGD-binding cleft ~20 Å in diameter and a distal domain with
extended, flexible tails. Kinetic analysis of Ad2 interactions with
v
5 indicated ~4.2 integrin molecules bound per
penton base at close to saturation. These results suggest that the
precise spatial arrangement of five RGD protrusions on the penton base
promotes integrin clustering and the signaling events required for
virus internalization.
*
Corresponding author. Mailing address for Phoebe L. Stewart: Department of Molecular and Medical Pharmacology, UCLA School of Medicine, A-324 CIBI, Box 951770, Los Angeles, CA 90095-1770. Phone:
(310) 206-7055. Fax: (310) 206-8975. E-mail:
pstewart{at}mednet.ucla.edu. Mailing address for Glen R. Nemerow: Department of Immunology, The Scripps Research Institute, La
Jolla, CA 92037. Phone: (619) 784-8072. Fax: (619) 784-8472. E-mail:
gnemerow{at}scripps.edu.
Journal of Virology, August 1999, p. 6759-6768, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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