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硕博科研从0到1|Gromacs下载安装&计算

  • 2026-07-25 09:29:13
硕博科研从0到1|Gromacs下载安装&计算
一、下载&安装
Conda一键下载安装.
具体命令(linux):

conda install -c conda-forge gromacs=2025.2 安装指定版本

conda create -n gromacs_env (创建一个名为 gromacs_env 的新环境

conda activate gromacs_env 激活该环境

conda install -c conda-forge gromacs (在新环境中安装 GROMACS

conda search -c conda-forge gromacs (安装支持 GPU 的版本)

gmx --version

二、计算
1. 准备工作
(1)力场选择和力场文件下载
① CHARMM36 力场:由MacKerell等开发的全原子生物大分子力场,旨在高精度模拟蛋白质、核酸、脂质和碳水化合物等生物大分子。
下载链接:http://mackerell.umaryland.edu/CHARMM_ff_params.html

② OPLS-AA 力场:由Jorgensen等开发的全原子力场,其参数优化目标是精确再现纯有机液体的热力学和结构性质。

下载链接:https://traken.chem.yale.edu/oplsaam.html

③ CGenFF力场:主要由 Kenno Vanommeslaeghe 和 Alexander D. MacKerell Jr. 及其团队开发专门为类药分子和广泛有机分子提供参数,使其能与CHARMM力场完美兼容。

下载链接:http://dogmans.umaryland.edu/~kenno/cgenff/download.html

④ AMBER力场 :其中通用小分子力场 GAFF 由 Junmei Wang(王军梅)、David A. Case、Peter A. Kollman 等开发(2004 年);而蛋白质/核酸等生物大分子力场(如 ff14SB、ff99)则由 AMBER 开发团队历代成员持续贡献。

下载链接:https://ambermd.org/GetAmber.php,也可以conda一键下载

整个模拟体系(溶质 + 所有溶剂)应使用 同一力场家族 的参数(如都使用 GAFF/AMBER 体系,或都使用 CHARMM/CGenFF 体系),混用不同家族的力场会导致原子类型冲突。

(2)溶剂(除水外)的力场文件准备
SwissParam 为溶剂生成拓扑文件(成与 CHARMM36 力场兼容的 .itp 拓扑文件)。
Acpype 默认调用 AmberTools 的antechamber,其默认力场是 GAFF。
LigParGe OPLS-AA力场参数生成工具由Jorgensen团队开发。
CGenFF力场在CGenFF 的参数生成网站 https://www.paramchem.org/生成。
需要用到的几种文件格式:
  • .mol2转化gromacs的输入文件

  • .top (或 .topol.top)主拓扑文件,引用所有 .itp 文件,定义体系组成。

  • .itp最核心的gromacs计算输入文件,直接放到 topol.top 里引用。

  • .pdb:可作为坐标输入,但建议转成 .gro 格式再使用。坐标文件,定义原子的初始位置。

  • .rtf.prm.psf.crd过程文件,可以保留作为备份或检查,但对 GROMACS 模拟不是必需的。

  • .trr/.xtc轨迹文件原子坐时间的

  • .edr能量文件,记录体系的能量、温度、压力等随时间的变化

  • .mdp模拟参数文件,定义模拟条件(温度、压力、步长等)

  • .tpr最终的二进制输入文件,由 gmx grompp 生成,是 gmx mdrun 的唯一输入,.gro,.top,.mdp完整合并、压缩、二进制化成一个 .tpr 文件

  • .xvg计算输出文件,分析提取可读的数值数据通过gmx energy/rmsd等命令从.edr/.xtc中提取,用于绘图

2. 模拟计算
(1)建立盒子→填充溶剂(水、有机溶剂)→添加离子(中和电荷)
nano topol.top (建立top文件)
gmx editconf -f GG.gro -o box.gro -c -d 1.0 -bt cubic (将溶质GG置于盒子中心,与边缘保持 1.0 nm 距离)
gmx insert-molecules -f box.gro -ci 溶剂.gro -o box_溶剂.gro -nmol N (插入指定数量的其它溶剂分子)
gmx solvate -cp box_溶剂.gro -cs spc216.gro -o solv.gro -p topol.top(用水填满盒子剩余空间,自动更新拓扑)
gmx grompp -f ions.mdp -c solv.gro -p topol.top -o ions.tpr (插入离子前的准备)
gmx genion -s ions.tpr -o solv_ions.gro -p topol.top -pname NA -nname CL -neutral (插入离子替换部分溶剂)
(2)模拟:能量最小化 (升温至目标温度)→NPT 平衡(调整密度和压力)生产模拟(采集数据)
gmx grompp -fem.mdp -c solv_ions.gro -p topol.top -o em.tpr -maxwarn1(建立输入文件)
gmx mdrun -v -deffnm e(运行能量最小化)
gmx grompp -f nvt.mdp -c em.gro -p topol.top -o nvt.tpr -maxwarn 1 (准备 NVT输入文件)
gmx mdrun -v -deffnm nvt -ntmpi 1 (运行NVT平衡,升温至目标温度
gmx grompp -f npt.mdp -c nvt.gro -t nvt.cpt -p topol.top -o npt.tpr -maxwarn(准备 NPT输入文件)
gmx mdrun -v-deffnm npt -ntmpi1 (运行NPT平衡,调整密度和压力)
gmx grompp -f md.mdp -c npt.gro -t npt.cpt -p topol.top -o md.tpr -maxwarn 1 (生产模拟)
gmx mdrun -v -deffnm md -ntmpi 1 (运行生产模拟(时间根据需要设定)
输出md.xtc(轨迹)、md.edr(能量)、md.log(日志
(3)数据分析
gmx rms -s md.tpr -f md.xtc -o rmsd.xvg (构象变化分析(RMSD)RMSD 值越低且平稳 )
gmx gyrate -s md.tpr -f md.xtc -o gyrate.xvg (计算回转半径(Rg):Rg衡量分子尺寸和紧凑程度。Rg 值越小,分子结构越紧凑)
gmx hbond -s md.tpr -f md.xtc -num hbnum.xvg (氢键分析)
gmx energy -f md.edr -o energy.xvg(能量分析)
gmx rdf -s md.tpr -f md.xtc -o rdf.xvg(计算径向分布函数:分析溶剂在溶质周围的分布密度)
gmx sasa -s md.tpr -f md.xtc -o sasa.xvg计算溶剂可及表面积:分析溶质与溶剂的接触面积
vmd md.gro md.xtc(vmd可视化轨迹)
输出.xvg (作图数据)
对比不同数据时取稳定段的平均值 ± 标准差。

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  1. CONNECT:[ UseTime:0.000529s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000932s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000562s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000609s ]
  8. SELECT * FROM `article` WHERE `id` = 486628 LIMIT 1 [ RunTime:0.000459s ]
  9. UPDATE `article` SET `lasttime` = 1784957184 WHERE `id` = 486628 [ RunTime:0.003075s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000306s ]
  11. SELECT * FROM `article` WHERE `id` < 486628 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000453s ]
  12. SELECT * FROM `article` WHERE `id` > 486628 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000827s ]
  13. SELECT * FROM `article` WHERE `id` < 486628 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002270s ]
  14. SELECT * FROM `article` WHERE `id` < 486628 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001102s ]
  15. SELECT * FROM `article` WHERE `id` < 486628 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000962s ]
0.083926s