東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Role of new virulence mechanisms/fac...

Pillai, Lakshmi.

FindBook

Google Book

Amazon

博客來

Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila./
作者:	Pillai, Lakshmi.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2006,
面頁冊數:	182 p.
附註:	Source: Dissertations Abstracts International, Volume: 70-01, Section: B.
Contained By:	Dissertations Abstracts International70-01B.
標題:	Cellular biology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3308277
ISBN:	9780549569589

Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila.
Pillai, Lakshmi.

Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila. - Ann Arbor : ProQuest Dissertations & Theses, 2006 - 182 p.

Source: Dissertations Abstracts International, Volume: 70-01, Section: B.

Thesis (Ph.D.)--The University of Texas Medical Branch Graduate School of Biomedical Sciences, 2006.

Aeromonas hydrophila, a gram-negative bacterium that causes gastroenteritis, wound infections, septicemia, and other diseases in humans, produces many different virulence factors. A clinical isolate SSU of A. hydrophila possesses a cytotoxic enterotoxin Act, a potent virulence factor that is secreted into the environment through the bacterium's type 2 secretion system (T2SS) and possesses several biological activities, including cytotoxicity, enterotoxicity, and lethality in a mouse model. The purpose of this study was to identify new virulence factors that contribute to the pathogenesis of this bacterium. We identified and characterized a type 3 secretion system (T3SS) in A. hydrophila SSU. By marker-exchange mutagenesis of the aopB gene, a crucial gene involved in the formation of the translocon apparatus, the functionality of the T3SS was elucidated, both in in vitro and in vivo models. Further, the characterization of the regulatory gene DNA adenine methyltransferase (Dam) from SSU and its role in modulating the function of both the T3SS and Act was investigated. The role of the T3SS in influencing the phenomenon of quorum sensing (QS) in A. hydrophila SSU was also conducted. This study highlights a unique link between the T3SS and Act of A. hydrophila and the production of QS molecules or lactones. While searching for potential effector proteins secreted through the T3SS of A. hydrophila SSU, the identification of a new virulence factor, ToxR regulated lipoprotein (TagA), was revealed. TagA is a zinc metalloprotease which has only been identified in the gram-negative pathogens, Escherichia coli O157:H7 and Vibrio cholerae . In A. hydrophila, TagA has been shown to play a role in the inhibition of complement by binding to and cleaving the serpin C1-INH. By recruiting C1-INH to the surface of the bacteria and cleaving it, TagA is able to significantly prevent the activation of complement at the cell surface, ultimately increasing the serum resistance of the pathogen. TagA can also target C1-INH to erythrocyte surfaces and decrease the lysis that occurs in the presence of serum. Confocal fluorescence microscopy revealed that the serpin C1-INH binds to TagA on the surface of the bacteria.

ISBN: 9780549569589Subjects--Topical Terms:

3172791
Cellular biology.
Subjects--Index Terms:

Aeromonas hydrophila

Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila.
LDR:03569nmm a2200385 4500 001 2402835
005 20241104055709.5
006 m o d
007 cr#unu||||||||
008 251215s2006 ||||||||||||||||| ||eng d
020 $a 9780549569589
035 $a (MiAaPQ)AAI3308277
035 $a AAI3308277
035 $a 2402835
040 $a MiAaPQ $c MiAaPQ
100 1 $a Pillai, Lakshmi. $3 3773084
245 1 0 $a Role of new virulence mechanisms/factors (type 3 secretion system and Tox -R regulated lipoprotein [TagA]) in the pathogenesis of the emerging human pathogen Aeromonas hydrophila.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2006
300 $a 182 p.
500 $a Source: Dissertations Abstracts International, Volume: 70-01, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Chopra, Ashok K.
502 $a Thesis (Ph.D.)--The University of Texas Medical Branch Graduate School of Biomedical Sciences, 2006.
520 $a Aeromonas hydrophila, a gram-negative bacterium that causes gastroenteritis, wound infections, septicemia, and other diseases in humans, produces many different virulence factors. A clinical isolate SSU of A. hydrophila possesses a cytotoxic enterotoxin Act, a potent virulence factor that is secreted into the environment through the bacterium's type 2 secretion system (T2SS) and possesses several biological activities, including cytotoxicity, enterotoxicity, and lethality in a mouse model. The purpose of this study was to identify new virulence factors that contribute to the pathogenesis of this bacterium. We identified and characterized a type 3 secretion system (T3SS) in A. hydrophila SSU. By marker-exchange mutagenesis of the aopB gene, a crucial gene involved in the formation of the translocon apparatus, the functionality of the T3SS was elucidated, both in in vitro and in vivo models. Further, the characterization of the regulatory gene DNA adenine methyltransferase (Dam) from SSU and its role in modulating the function of both the T3SS and Act was investigated. The role of the T3SS in influencing the phenomenon of quorum sensing (QS) in A. hydrophila SSU was also conducted. This study highlights a unique link between the T3SS and Act of A. hydrophila and the production of QS molecules or lactones. While searching for potential effector proteins secreted through the T3SS of A. hydrophila SSU, the identification of a new virulence factor, ToxR regulated lipoprotein (TagA), was revealed. TagA is a zinc metalloprotease which has only been identified in the gram-negative pathogens, Escherichia coli O157:H7 and Vibrio cholerae . In A. hydrophila, TagA has been shown to play a role in the inhibition of complement by binding to and cleaving the serpin C1-INH. By recruiting C1-INH to the surface of the bacteria and cleaving it, TagA is able to significantly prevent the activation of complement at the cell surface, ultimately increasing the serum resistance of the pathogen. TagA can also target C1-INH to erythrocyte surfaces and decrease the lysis that occurs in the presence of serum. Confocal fluorescence microscopy revealed that the serpin C1-INH binds to TagA on the surface of the bacteria.
590 $a School code: 0764.
650 4 $a Cellular biology. $3 3172791
650 4 $a Microbiology. $3 536250
653 $a Aeromonas hydrophila
653 $a Tox-R regulated lipoprotein
653 $a Type III secretion
653 $a Virulence
690 $a 0379
690 $a 0410
710 2 $a The University of Texas Medical Branch Graduate School of Biomedical Sciences. $3 1021861
773 0 $t Dissertations Abstracts International $g 70-01B.
790 $a 0764
791 $a Ph.D.
792 $a 2006
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3308277