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      The cell biology of receptor-mediated virus entry

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      The Journal of Cell Biology
      The Rockefeller University Press

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          Abstract

          The cell imposes multiple barriers to virus entry. However, viruses exploit fundamental cellular processes to gain entry to cells and deliver their genetic cargo. Virus entry pathways are largely defined by the interactions between virus particles and their receptors at the cell surface. These interactions determine the mechanisms of virus attachment, uptake, intracellular trafficking, and, ultimately, penetration to the cytosol. Elucidating the complex interplay between viruses and their receptors is necessary for a full understanding of how these remarkable agents invade their cellular hosts.

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          Angiotensin-converting enzyme 2 is a functional receptor for the SARS coronavirus

          Spike (S) proteins of coronaviruses, including the coronavirus that causes severe acute respiratory syndrome (SARS), associate with cellular receptors to mediate infection of their target cells 1,2 . Here we identify a metallopeptidase, angiotensin-converting enzyme 2 (ACE2) 3,4 , isolated from SARS coronavirus (SARS-CoV)-permissive Vero E6 cells, that efficiently binds the S1 domain of the SARS-CoV S protein. We found that a soluble form of ACE2, but not of the related enzyme ACE1, blocked association of the S1 domain with Vero E6 cells. 293T cells transfected with ACE2, but not those transfected with human immunodeficiency virus-1 receptors, formed multinucleated syncytia with cells expressing S protein. Furthermore, SARS-CoV replicated efficiently on ACE2-transfected but not mock-transfected 293T cells. Finally, anti-ACE2 but not anti-ACE1 antibody blocked viral replication on Vero E6 cells. Together our data indicate that ACE2 is a functional receptor for SARS-CoV. Supplementary information The online version of this article (doi:10.1038/nature02145) contains supplementary material, which is available to authorized users.
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            Isolation of a common receptor for Coxsackie B viruses and adenoviruses 2 and 5.

            A complementary DNA clone has been isolated that encodes a coxsackievirus and adenovirus receptor (CAR). When transfected with CAR complementary DNA, nonpermissive hamster cells became susceptible to coxsackie B virus attachment and infection. Furthermore, consistent with previous studies demonstrating that adenovirus infection depends on attachment of a viral fiber to the target cell, CAR-transfected hamster cells bound adenovirus in a fiber-dependent fashion and showed a 100-fold increase in susceptibility to virus-mediated gene transfer. Identification of CAR as a receptor for these two unrelated and structurally distinct viral pathogens is important for understanding viral pathogenesis and has implications for therapeutic gene delivery with adenovirus vectors.
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              Virus Entry: Open Sesame

              Detailed information about the replication cycle of viruses and their interactions with host organisms is required to develop strategies to stop them. Cell biology studies, live-cell imaging, and systems biology have started to illuminate the multiple and subtly different pathways that animal viruses use to enter host cells. These insights are revolutionizing our understanding of endocytosis and the movement of vesicles within cells. In addition, such insights reveal new targets for attacking viruses before they can usurp the host-cell machinery for replication.
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                Author and article information

                Journal
                J Cell Biol
                J. Cell Biol
                jcb
                The Journal of Cell Biology
                The Rockefeller University Press
                0021-9525
                1540-8140
                26 December 2011
                : 195
                : 7
                : 1071-1082
                Affiliations
                Cell Biology Unit, Medical Research Council Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, England, UK
                Author notes
                Correspondence to Joe Grove: j.grove@ 123456ucl.ac.uk
                Article
                201108131
                10.1083/jcb.201108131
                3246895
                22123832
                014b1daf-e3ac-49af-8d9f-8c21f88660c1
                © 2011 Grove and Marsh

                This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).

                History
                : 22 August 2011
                : 19 October 2011
                Categories
                8
                Reviews
                Review
                Host–pathogen interactions

                Cell biology
                Cell biology

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