國立高雄大學圖資館 |

Language: English

Back

Structure determination of HIV-1 Tat...

Akabori, Kiyotaka.

Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scattering

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scatteringby Kiyotaka Akabori.
Author:	Akabori, Kiyotaka.
Published:	Cham :Springer International Publishing :2015.
Description:	xx, 168 p. :ill., digital ;24 cm.
Contained By:	Springer eBooks
Subject:	Lipid membranes.
Online resource:	http://dx.doi.org/10.1007/978-3-319-22210-3
ISBN:	9783319222103$q(electronic bk.)

Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scattering
Akabori, Kiyotaka.

Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scattering[electronic resource] /by Kiyotaka Akabori. - Cham :Springer International Publishing :2015. - xx, 168 p. :ill., digital ;24 cm. - Springer theses,2190-5053. - Springer theses..

This Thesis in biological physics has two components, describing the use of X-ray scattering techniques to study the structure of two different stacked lipid membrane systems. The first part focuses on the interaction between a short 11-mer peptide, Tat, which is part of the Tat protein in the HIV-1 virus. Although highly positively charged, the Tat protein has been shown to translocate through hydrocarbon lipid bilayers easily, without requiring the cell's energy, which is counter to its Born self-energy. In this work Tat's location in the headgroup region was demonstrated using a combined X-ray scattering and molecular dynamics approach. Bilayer thinning was observed as well as softening of different membrane mimics due to Tat. It was concluded that Tat's headgroup location, which increases the area/lipid, and its bilayer softening likely reduce the energy barrier for passive translocation. The second part is a rigorous investigation of an enigmatic phase in the phase diagram of the lipid dimyristoylphosphatidylcholine (DMPC) The ripple phase has fascinated many researchers in condensed matter physics and physical chemistry as an example of periodically modulated phases, with many theoretical and simulation papers published. Despite systematic studies over the past three decades, molecular details of the structure were still lacking. By obtaining the highest resolution X-ray data so far, this work revealed the complex nature of the chain packing, as well as confirming that the major side is thicker than the minor side of the saw-tooth ripple structure. The new model shows that the chains in the major arm are tilted with respect to the bilayer normal and that the chains in the minor arm are slightly more disordered than all-trans gel-phase chains, i.e., the chains in the minor arm are more fluid-like. This work provides the highest resolution X-ray structure of the ripple phase to-date.

ISBN: 9783319222103$q(electronic bk.)

Standard No.: 10.1007/978-3-319-22210-3doiSubjects--Topical Terms:

340392
Lipid membranes.

LC Class. No.: QH602

Dewey Class. No.: 574.875

Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scattering
LDR:02956nmm a2200325 a 4500 001 477096
003 DE-He213
005 20160407133634.0
006 m d
007 cr nn 008maaau
008 160526s2015 gw s 0 eng d
020 $a 9783319222103$q(electronic bk.)
020 $a 9783319222097$q(paper)
024 7 $a 10.1007/978-3-319-22210-3 $2 doi
035 $a 978-3-319-22210-3
040 $a GP $c GP
041 0 $a eng
050 4 $a QH602
072 7 $a PHVN $2 bicssc
072 7 $a PSF $2 bicssc
072 7 $a SCI009000 $2 bisacsh
082 0 4 $a 574.875 $2 23
090 $a QH602 $b .A313 2015
100 1 $a Akabori, Kiyotaka. $3 731995
245 1 0 $a Structure determination of HIV-1 Tat/Fluid phase membranes and DMPC pipple phase using X-Ray scattering $h [electronic resource] / $c by Kiyotaka Akabori.
260 $a Cham : $b Springer International Publishing : $b Imprint: Springer, $c 2015.
300 $a xx, 168 p. : $b ill., digital ; $c 24 cm.
490 1 $a Springer theses, $x 2190-5053
520 $a This Thesis in biological physics has two components, describing the use of X-ray scattering techniques to study the structure of two different stacked lipid membrane systems. The first part focuses on the interaction between a short 11-mer peptide, Tat, which is part of the Tat protein in the HIV-1 virus. Although highly positively charged, the Tat protein has been shown to translocate through hydrocarbon lipid bilayers easily, without requiring the cell's energy, which is counter to its Born self-energy. In this work Tat's location in the headgroup region was demonstrated using a combined X-ray scattering and molecular dynamics approach. Bilayer thinning was observed as well as softening of different membrane mimics due to Tat. It was concluded that Tat's headgroup location, which increases the area/lipid, and its bilayer softening likely reduce the energy barrier for passive translocation. The second part is a rigorous investigation of an enigmatic phase in the phase diagram of the lipid dimyristoylphosphatidylcholine (DMPC) The ripple phase has fascinated many researchers in condensed matter physics and physical chemistry as an example of periodically modulated phases, with many theoretical and simulation papers published. Despite systematic studies over the past three decades, molecular details of the structure were still lacking. By obtaining the highest resolution X-ray data so far, this work revealed the complex nature of the chain packing, as well as confirming that the major side is thicker than the minor side of the saw-tooth ripple structure. The new model shows that the chains in the major arm are tilted with respect to the bilayer normal and that the chains in the minor arm are slightly more disordered than all-trans gel-phase chains, i.e., the chains in the minor arm are more fluid-like. This work provides the highest resolution X-ray structure of the ripple phase to-date.
650 0 $a Lipid membranes. $3 340392
650 0 $a Membranes (Biology) $x Fluidity. $3 731996
650 0 $a HIV infections. $3 329238
650 0 $a X-rays $x Scattering. $3 229799
650 1 4 $a Physics. $3 179414
650 2 4 $a Membranes. $3 510189
650 2 4 $a Crystallography. $3 194341
650 2 4 $a Membrane Biology. $3 384426
650 2 4 $a Physical Chemistry. $3 273698
710 2 $a SpringerLink (Online service) $3 273601
773 0 $t Springer eBooks
830 0 $a Springer theses. $3 557607
856 4 0 $u http://dx.doi.org/10.1007/978-3-319-22210-3
950 $a Physics and Astronomy (Springer-11651)