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[資源]
分享一篇用namd2做模擬來解釋二甲基化的文章
大家好!
這篇文章結(jié)合hole和namd2做的一篇文章,通過孔道來論證SET9是如何二甲基化的底物分子的,并與JBC上的一篇文章的實驗結(jié)論吻合。
下載地址:http://dx.plos.org/10.1371/journal.pone.0019856
摘要:
SET9, a protein lysine methyltransferase, has been thought to be capable of transferring only one methyl group to target lysine residues. However, some reports have pointed out that SET9 can dimethylate Lys372 of p53 (p53-K372) and Lys4 of histone H3 (H3-K4). In order to understand how p53 can be dimethylated by SET9, we measured the radius of the channel that surrounds p53-K372, first on the basis of the crystal structure of SET9, and we show that the channel is not suitable for water movement. Second, molecular dynamic (MD) simulations were carried out for 204 ns on the crystal structure of SET9. The results show that water leaves the active site of SET9 through a new channel, which is made of G292, A295, Y305 and Y335. In addition, the results of molecular docking and MD simulations indicate that the new water channel continues to remain open when S-adenosyl-L-methionine (AdoMet) or S-adenosyl-L-homocysteine (AdoHcy) is bound to SET9. The changes in the radii of these two channels were measured in the equilibrium phase at the constant temperature of 300 K. The results indicate that the first channel still does not allow water to get into or out of the active site, but the new channel is large enough to allow this water to circulate. Our results indicate that water can be removed from the active site, an essential process for allowing the dimethylation reaction to occur.[ Last edited by JPPF on 2011-12-14 at 19:05 ] |
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- 附件 1 : SET9.pdf
2011-12-14 18:59:15, 1.69 M
- 附件 2 : SET9_experiment.pdf
2011-12-14 18:59:22, 2.42 M
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