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Effect of cholesterol on DMPC phospholipid membranes and QSAR model construction in membrane-interaction QSAR study through molecular dynamics simulation.

Abstract：

:In this study, both pure DMPC and DMPC/cholesterol mixed membrane monolayer were built to compare the physical-chemical properties and dynamics properties through molecular dynamics simulation and normal-mode analysis. The results show that the addition of cholesterol decreases the area of per molecule of membrane, increases the lipid amplitude motion, and changes the solute diffusion coefficient. It is also found that the addition of cholesterol greatly changes the solute-membrane 1,4-nonbonded interaction energy (deltaE14). MI-QSAR models were constructed based on solute-membrane interaction energy descriptors and other intramolecular descriptors. The results show that deltaE14 substitutes deltaE(HB) as the second important descriptor compared with the previous study. Final results suggest that short range solute-membrane interaction energy changes due to the uptake of the solute may play an important decision on permeability in DMPC/cholesterol membrane. A test set was applied to evaluate the predictivity of MI-QSAR models. The result suggests that the combination of F(H2O) and deltaE14 not only improves r2 and q2, but also greatly improves the model predictivity. Based on the combination of q2 and r(pre)2 values, a two-term model is better used to predict the solute permeability in this study (r2 = 0.859, q2 = 0.803, and r(pre)2 = 0.540). Due to the small sample both in training set and test set, more datasets are necessary to make a final decision about the model construction and prediction.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Liu J,Yang L

doi

10.1016/j.bmc.2005.11.009

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

2225-34

issue

7

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(05)01070-9

journal_volume

14

pub_type

杂志文章

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