The microstructure of DNA-egg yolk phosphatidylcholine-gemini surfactants complexes: effect of the spacer length.
Drug Metabol Drug Interact
; 27(1): 47-54, 2012 Feb 14.
Article
em En
| MEDLINE
| ID: mdl-22718624
ABSTRACT
BACKGROUND:
The length of spacer of gemini surfactants affects the DNA packing in DNA-neutral phospholipid-gemini surfactant complexes.METHODS:
The microstructure of complexes DNA-egg yolk phosphatidylcholine (EYPC)-alkane-α,ω-diyl-bis(dodecyl\xaddimethylammonium bromides) (CnGS, spacer n=2-12, n is even) was studied using small angle X-ray diffraction.RESULTS:
At EYPCCnGS=11 mol/mol, the condensed lamellar phase was identified in complexes with CnGS, n=2-4, whereas longer spacer (n≥6) induced a hexagonal phase. The condensed lamellar phase Lαc was observed in the range 2\≤ EYPCGnGS≤10 (mol/mol) in all complexes. The distance between adjacent DNA strands increases linearly with decreasing surface charge density of EYPC-CnGS vesicles. We determined the increase in dDNA 0.40±0.03 nm/1 mol of EYPC from the slope of dDNA=f (molEYPC/molCnGS) in the range of molar ratios 2≤EYPCCnGS≤5. At lower surface charge density, EYPCCnGS>5 mol/mol, the length of CnGS spacer (n=6-10) modulates the DNA-DNA distance.CONCLUSIONS:
Both the short spacer of CnGS and the low molar ratio EYPCCnGS result in the closest DNA-DNA packing. A high surface charge density of membrane was reported as a key parameter for transfection efficiency of Lαc phase-forming complexes.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatidilcolinas
/
Tensoativos
/
DNA
/
Gema de Ovo
/
Compostos de Amônio Quaternário
Idioma:
En
Revista:
Drug Metabol Drug Interact
Assunto da revista:
FARMACOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Eslováquia