東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The HIV-1 Env Gp41 Cytoplasmic Tail:...

Durham, Natasha D.

Linked to FindBook

Google Book

Amazon

博客來

The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization./
Author:	Durham, Natasha D.
Description:	92 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
Contained By:	Dissertation Abstracts International77-06B(E).
Subject:	Microbiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3746544
ISBN:	9781339399799

The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization.
Durham, Natasha D.

The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization. - 92 p.

Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.

Thesis (Ph.D.)--Icahn School of Medicine at Mount Sinai, 2016.

Neutralizing antibody responses in HIV-1 infected individuals are directed against the HIV-1 envelope (Env) protein. The Env protein has evolved to avoid exposure of neutralizing epitopes, and maintain its ability to mediate viral entry. Direct T cell-to-T cell HIV-1 infection through virological synapses (VS) has been increasingly recognized as a major mode of infection during in vitro co-culture of infected and uninfected T cells and has the potential to make significant contributions to overall infection in vivo, warranting further investigation of this mode of infection. Here, we assessed the neutralization of cell-to-cell infection by polyclonal patient sera from two HIV-1 positive individuals, as well as a panel of broadly neutralizing monoclonal antibodies (mAbs). Neutralization of cell-to-cell infection required higher concentrations of patient sera and a 7 to 70-fold higher 50% inhibitory concentration (IC50) of the anti-Env mAbs compared to cell-free infection. Recognizing the influence of the gp41 cytoplasmic tail (CT) on Env conformation and function during cell-free infection, we next carried out neutralization assays on an HIV-1 mutant with a full truncation of the gp41 CT, ?CT144. Despite higher levels of cell-surface Env expression, CT truncation specifically enhanced neutralization in our cell-to-cell assays, with little or no effect on the IC50 of cell-free infection. Although ?CT144 can replicate in vitro in specific permissive cell types, systematic truncation does not always produce infectious HIV-1 particles. Because of the key role that the Env CT plays in Env packaging, viral fusion and subsequent cell-free infectivity, we were interested in determining if these functions were conserved during cell-to-cell transmission through the VS. We identified viral mutants that were severely defective in either cell-free or cell-to-cell infection, providing further evidence that these two modes of infection are distinct. Taken together, our results indicate that there are (i) conformational differences between virion-associated and cell-associated Env that influence neutralization sensitivity, and (ii) mechanistic differences that distinguish how the Env CT participates in cell-free or cell-to-cell infection.

ISBN: 9781339399799Subjects--Topical Terms:

536250
Microbiology.

The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization.
LDR:03204nmm a2200289 4500 001 2115094
005 20161114124754.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781339399799
035 $a (MiAaPQ)AAI3746544
035 $a AAI3746544
040 $a MiAaPQ $c MiAaPQ
100 1 $a Durham, Natasha D. $3 3276728
245 1 4 $a The HIV-1 Env Gp41 Cytoplasmic Tail: Key Functions During Cell-to-Cell Infection and Neutralization.
300 $a 92 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-06(E), Section: B.
500 $a Adviser: Benjamin K. Chen.
502 $a Thesis (Ph.D.)--Icahn School of Medicine at Mount Sinai, 2016.
520 $a Neutralizing antibody responses in HIV-1 infected individuals are directed against the HIV-1 envelope (Env) protein. The Env protein has evolved to avoid exposure of neutralizing epitopes, and maintain its ability to mediate viral entry. Direct T cell-to-T cell HIV-1 infection through virological synapses (VS) has been increasingly recognized as a major mode of infection during in vitro co-culture of infected and uninfected T cells and has the potential to make significant contributions to overall infection in vivo, warranting further investigation of this mode of infection. Here, we assessed the neutralization of cell-to-cell infection by polyclonal patient sera from two HIV-1 positive individuals, as well as a panel of broadly neutralizing monoclonal antibodies (mAbs). Neutralization of cell-to-cell infection required higher concentrations of patient sera and a 7 to 70-fold higher 50% inhibitory concentration (IC50) of the anti-Env mAbs compared to cell-free infection. Recognizing the influence of the gp41 cytoplasmic tail (CT) on Env conformation and function during cell-free infection, we next carried out neutralization assays on an HIV-1 mutant with a full truncation of the gp41 CT, ?CT144. Despite higher levels of cell-surface Env expression, CT truncation specifically enhanced neutralization in our cell-to-cell assays, with little or no effect on the IC50 of cell-free infection. Although ?CT144 can replicate in vitro in specific permissive cell types, systematic truncation does not always produce infectious HIV-1 particles. Because of the key role that the Env CT plays in Env packaging, viral fusion and subsequent cell-free infectivity, we were interested in determining if these functions were conserved during cell-to-cell transmission through the VS. We identified viral mutants that were severely defective in either cell-free or cell-to-cell infection, providing further evidence that these two modes of infection are distinct. Taken together, our results indicate that there are (i) conformational differences between virion-associated and cell-associated Env that influence neutralization sensitivity, and (ii) mechanistic differences that distinguish how the Env CT participates in cell-free or cell-to-cell infection.
590 $a School code: 1734.
650 4 $a Microbiology. $3 536250
650 4 $a Virology. $3 642304
650 4 $a Immunology. $3 611031
690 $a 0410
690 $a 0720
690 $a 0982
710 2 $a Icahn School of Medicine at Mount Sinai. $b Microbiology. $3 3194085
773 0 $t Dissertation Abstracts International $g 77-06B(E).
790 $a 1734
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3746544