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zhongshun

至尊木虫 (著名写手)

[求助] 求助关于solvate的一些疑惑

请问怎么判断溶解蛋白的水球是否足够大,我一直使用vmd的wat_sphere.tcl脚本将蛋白溶解于水溶液中,vmd 中看到的蛋白质肽链的末段好像有一部分在水球的外面。。。。。。。
有没有什么方法可以稍微增大水球的大小呀?求指点
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zhongshun

至尊木虫 (著名写手)

溶液的形状是球状的,但是怎么在wat_sphere.tcl脚本中增加水球的半径呢,是改变哪个参数呀?希望版主能具体指导
3楼2012-07-01 21:57:25
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jiaoyixiong

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【答案】应助回帖

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感谢参与,应助指数 +1
zh1987hs: 金币+2, 谢谢 2012-07-01 17:46:25
你所说的水球是什么意思?

是溶液的形状是球状的吗?

那你把球状的半径增大一些不就可以了吗?
2楼2012-07-01 16:47:22
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jiaoyixiong

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chaizhm: 金币+2, 谢谢~ 2012-07-02 09:15:50
引用回帖:
3楼: Originally posted by zhongshun at 2012-07-01 21:57:25
溶液的形状是球状的,但是怎么在wat_sphere.tcl脚本中增加水球的半径呢,是改变哪个参数呀?希望版主能具体指导

你需要把 wat_sphere.tcl 中的每个命令看明白,你就知道怎么修改了。

PS
我这里没有你所说的这个脚本,无法得知
4楼2012-07-01 23:45:27
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zhongshun

至尊木虫 (著名写手)

### Script to immerse ubiquitin in a sphere of water just large enough
### to cover it

set molname xia41h

mol new ${molname}.psf
mol addfile ${molname}.pdb

### Determine the center of mass of the molecule and store the coordinates
set cen [measure center [atomselect top all] weight mass]
set x1 [lindex $cen 0]
set y1 [lindex $cen 1]
set z1 [lindex $cen 2]
set max 0

### Determine the distance of the farthest atom from the center of mass
foreach atom [[atomselect top all] get index] {
  set pos [lindex [[atomselect top "index $atom"] get {x y z}] 0]
  set x2 [lindex $pos 0]
  set y2 [lindex $pos 1]
  set z2 [lindex $pos 2]
  set dist [expr pow(($x2-$x1)*($x2-$x1) + ($y2-$y1)*($y2-$y1) + ($z2-$z1)*($z2-$z1),0.5)]
  if {$dist > $max} {set max $dist}
  }

mol delete top

### Solvate the molecule in a water box with enough padding (20 A).
### One could alternatively align the molecule such that the vector
### from the center of mass to the farthest atom is aligned with an axis,
### and then use no padding
package require solvate
solvate ${molname}.psf ${molname}.pdb -t 20 -o del_water

resetpsf
package require psfgen
mol new del_water.psf
mol addfile del_water.pdb
readpsf del_water.psf
coordpdb del_water.pdb

### Determine which water molecules need to be deleted and use a for loop
### to delete them
set wat [atomselect top "same residue as {water and ((x-$x1)*(x-$x1) + (y-$y1)*(y-$y1) + (z-$z1)*(z-$z1))<($max*$max)}"]
set del [atomselect top "water and not same residue as {water and ((x-$x1)*(x-$x1) + (y-$y1)*(y-$y1) + (z-$z1)*(z-$z1))<($max*$max)}"]
set seg [$del get segid]
set res [$del get resid]
set name [$del get name]
for {set i 0} {$i < [llength $seg]} {incr i} {
  delatom [lindex $seg $i] [lindex $res $i] [lindex $name $i]
  }
writepsf ${molname}_ws.psf
writepdb ${molname}_ws.pdb

mol delete top

mol new ${molname}_ws.psf
mol addfile ${molname}_ws.pdb
puts "CENTER OF MASS OF SPHERE IS: [measure center [atomselect top all] weight mass]"
puts "RADIUS OF SPHERE IS: $max"
mol delete top

我对solvate ${molname}.psf ${molname}.pdb -t 20 -o del_water这一行命令不是很懂。。。。。还有版主一般使用什么工具来进行溶剂化呀,昨天试了下packmol,但只是得到了pdb文件,不知道psf文件怎么得到?
5楼2012-07-02 09:43:13
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