Poly(amidoamine) dendrimers on lipid bilayers I: Free energy and conformation of binding.
Poly(amidoamine) dendrimers on lipid bilayers I: Free energy and conformation of binding.
复制标题
DOI:
10.1021/jp801377a
复制
发表时间:
2008-08-07
期刊:
影响因子:
--
通讯作者:
Andricioaei I
中科院分区:
文献类型:
--
作者:
Kelly CV;Leroueil PR;Nett EK;Wereszczynski JM;Baker JR Jr;Orr BG;Banaszak Holl MM;Andricioaei I
Third-generation (G3) poly(amidoamine) (PAMAM) dendrimers are simulated approaching 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) bilayers with fully atomistic molecular dynamics, which enables the calculation of a free energy profile along the approach coordinate. Three different dendrimer terminations are examined: protonated primary amine, uncharged acetamide, and deprotonated carboxylic acid. As the dendrimer and lipids become closer, their attractive force increases (up to 240 pN) and the dendrimer becomes deformed as it interacts with the lipids. The total energy release upon binding of a G3–NH3+, G3–Ac, or G3–COO– dendrimer to a DMPC bilayer is, respectively, 36, 26, or 47 kcal/mol or, equivalently, 5.2, 3.2, or 4.7 × 10–3 kcal/g. These results are analyzed in terms of the dendrimers’ size, shape, and atomic distributions as well as proximity of individual lipid molecules and particular lipid atoms to the dendrimer. For example, an area of 9.6, 8.2, or 7.9 nm2 is covered on the bilayer for the G3–NH3+, G3–Ac, or G3–COO– dendrimers, respectively, while interacting strongly with 18–13 individual lipid molecules.
登录
查看更多内容
DOI:
10.1021/jp8013783
发表时间:
2008-08-07
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
Kelly CV;Leroueil PR;Orr BG;Banaszak Holl MM;Andricioaei I
通讯作者:
Andricioaei I
影响因子:
3.3
作者:
Chang, R;Violi, A
通讯作者:
Violi, A
影响因子:
17.1
作者:
Landmark, Kevin J.;DiMaggio, Stassi;Orr, Bradford G.
通讯作者:
Orr, Bradford G.
影响因子:
3
作者:
BROOKS, BR;BRUCCOLERI, RE;KARPLUS, M
通讯作者:
KARPLUS, M
影响因子:
3.3
作者:
Dominy, BN;Brooks, CL
通讯作者:
Brooks, CL