On 24/02/2012 6:31 PM, James Starlight wrote:
Up! :)

Please provide me with the best sollution of my problem! I just want to copy some water mollecules from X-ray structure to my model and place it in the identical possitions inside the TM budle of my protein. What are the most trivial way to solve this task?

You have a non-trivial problem. You can either build the model on the structure that has the waters (pdb2gmx doesn't strip water, IIRC), or work out some geometric criteria for placing the waters afterwards. Not every problem has an existing tool for its solution.

Mark


James

2012/2/22 James Starlight <jmsstarli...@gmail.com <mailto:jmsstarli...@gmail.com>>

    Dear Gromacs Users!

    I want to perform simulation of the membrane receptor in the
    membtane environment. There are some evidence about precense of
    the functional-relevant internal water mollecules in the
    transmembrane alpha-helix bundle of the receptor.


    I want to take into account that internal water in my model. I
    have coordinates of the X-ray structures wich have all that water.
    Also I have perfect model of the same protein wich have not that
    water but have full-length structure ( there are some missing
    residues in the X-ray structures- e.g in the loop regions).

    So what the best way to build system would  be in my case?

    1-  Should I use X-ray structure where internal water has already
    present and build missing loops via model software ? How I could
    preserve the internal waters in that starting structure when this
    structure will be processed by pdb2gmx ?

    2- Or the best way is to incorporate all waters in the model of my
    protein ? If this aproach could be better what is the simplest way
    to transfer exact coordinates of water in that holo model ? )

    Thanks for help


    James





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