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Role of complexin in regulated exocy...

Cai, Haijiang.

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Role of complexin in regulated exocytosis.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Role of complexin in regulated exocytosis./
Author:	Cai, Haijiang.
Description:	125 p.
Notes:	Adviser: Robert H. Chow.
Contained By:	Dissertation Abstracts International68-04B.
Subject:	Biology, Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3261842

Role of complexin in regulated exocytosis.
Cai, Haijiang.

Role of complexin in regulated exocytosis. - 125 p.

Adviser: Robert H. Chow.

Thesis (Ph.D.)--University of Southern California, 2007.

Properly regulated exocytosis of neurotransmitters and hormones from membrane-delimited vesicles is essential for normal cellular function. At least 3 distinct steps are involved in regulated exocytosis: (1) the docking of vesicles at the appropriate plasma membrane, (2) priming of a subset of docked vesicles to become release-competent, i.e. able to release in response to a stimulus without further maturation steps, and (3) the fusion of the vesicle membrane with the plasma membrane, during which a fusion pore forms and dilates to release vesicle contents. A current working model to explain these steps in molecular terms is the SNARE hypothesis, which postulates that the vesicle membrane and the plasma membrane are brought into close proximity and triggered to fuse with each other by forming a stable SNARE core complex from the SNARE proteins on their membranes. Complexin, a small neuronal protein that binds to the assembled SNARE core complex, has been suggested to regulate neurotransmitter release by stabilizing the SNARE complex. Neurons lacking complexin show a dramatically reduced Ca2+-dependent neurotransmitter release, but how lacking complexin decreases the release and at which step of exocytosis does complexin participate are still unknown. In this study, we demonstrate that adrenal chromaffin cells express only one complexin isoform, complexin II. We show that chromaffin cells from complexin II knock-out mice exhibit markedly diminished readily releasable vesicle pools but show no change in kinetics of fusion pore dilation or morphological vesicle docking; overexpression of complexin II in complexin knock-out cells rescues the knock-out phenotype, and in wild-type cells, it markedly enhances the readily releasable pools. We conclude that complexin is a positive regulator for Ca2+-regulated exocytosis, acting upstream of fusion pore formation by facilitating vesicle priming. We further demonstrated that this priming function of complexin requires phosphorylation at serine-93.Subjects--Topical Terms:

1017816
Biology, Physiology.

Role of complexin in regulated exocytosis.
LDR:02824nam 2200253 a 45 001 945908
005 20110523
008 110523s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3261842
035 $a AAI3261842
040 $a UMI $c UMI
100 1 $a Cai, Haijiang. $3 1269315
245 1 0 $a Role of complexin in regulated exocytosis.
300 $a 125 p.
500 $a Adviser: Robert H. Chow.
500 $a Source: Dissertation Abstracts International, Volume: 68-04, Section: B, page: 2137.
502 $a Thesis (Ph.D.)--University of Southern California, 2007.
520 $a Properly regulated exocytosis of neurotransmitters and hormones from membrane-delimited vesicles is essential for normal cellular function. At least 3 distinct steps are involved in regulated exocytosis: (1) the docking of vesicles at the appropriate plasma membrane, (2) priming of a subset of docked vesicles to become release-competent, i.e. able to release in response to a stimulus without further maturation steps, and (3) the fusion of the vesicle membrane with the plasma membrane, during which a fusion pore forms and dilates to release vesicle contents. A current working model to explain these steps in molecular terms is the SNARE hypothesis, which postulates that the vesicle membrane and the plasma membrane are brought into close proximity and triggered to fuse with each other by forming a stable SNARE core complex from the SNARE proteins on their membranes. Complexin, a small neuronal protein that binds to the assembled SNARE core complex, has been suggested to regulate neurotransmitter release by stabilizing the SNARE complex. Neurons lacking complexin show a dramatically reduced Ca2+-dependent neurotransmitter release, but how lacking complexin decreases the release and at which step of exocytosis does complexin participate are still unknown. In this study, we demonstrate that adrenal chromaffin cells express only one complexin isoform, complexin II. We show that chromaffin cells from complexin II knock-out mice exhibit markedly diminished readily releasable vesicle pools but show no change in kinetics of fusion pore dilation or morphological vesicle docking; overexpression of complexin II in complexin knock-out cells rescues the knock-out phenotype, and in wild-type cells, it markedly enhances the readily releasable pools. We conclude that complexin is a positive regulator for Ca2+-regulated exocytosis, acting upstream of fusion pore formation by facilitating vesicle priming. We further demonstrated that this priming function of complexin requires phosphorylation at serine-93.
590 $a School code: 0208.
650 4 $a Biology, Physiology. $3 1017816
690 $a 0719
710 2 $a University of Southern California. $3 700129
773 0 $t Dissertation Abstracts International $g 68-04B.
790 $a 0208
790 1 0 $a Chow, Robert H., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3261842