Hi Shivam, I don't know Python so I can't answer about that part. However, you might be able to do without python, at least if each docked structure is a separate input file.

(1) first figure out what ChimeraX command(s) you want to run on each structure. You would do this by interactively using ChimeraX on one or two example structures, before you try to put commands into a script. Either you can try using the "hbonds" command directly by typing it into the command line, or you can use the H-Bonds GUI interface to choose the options that you want, and then click Apply -- this will show the resulting command in the Log. See: https://rbvi.ucsf.edu/chimerax/docs/user/commands/hbonds.html https://rbvi.ucsf.edu/chimerax/docs/user/tools/hbonds.html

If each docked structure is a separate input file (e.g. each one is a separate PDB file) then you can try the following two additional steps:

(2) put the ChimeraX command(s) from step (1) above into a plain text file named something.cxc https://rbvi.ucsf.edu/chimerax/docs/user/commands/usageconventions.html#cxc-files

(3) use the "open" command to run the .cxc file and its "forEachFile" option to specify looping through all the PDB files. For an example, see: https://rbvi.ucsf.edu/chimerax/docs/user/commands/open.html#forEachFile

However, if all the dockings are together in a single big file you may instead need to use python to loop through them as models (e.g. #2.1, 2.2, 2.3, etc.) and run the command(s) from step (1) above. Somebody else would have to advise on that.

I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On Jun 30, 2022, at 10:31 PM, Shivam Gupta via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Hello Chimera Team,

I want to explore the possibility of checking the protein-protein interaction (hydrogen bond) in the docked structure using python script.

Is it possible to check hydrogen bonds for high throughput data (docked protein structures) using Python?

Please guide me over this.

Thanks

Also, if you want to call the Python function for finding H-bonds, it’s find_hbonds() in chimerax.hbonds. I’ve appended the function’s doc string. Note that with default parameters it is going to use strict angle/distance criteria, i.e. no additional “slop” added. You can get the recommended slop values from chimerax.hbonds as rec_dist_slop and rec_angle_slop.

--Eric

Eric Pettersen UCSF Computer Graphics Lab

def find_hbonds(session, structures, *, inter_model=True, intra_model=True, donors=None, acceptors=None, dist_slop=0.0, angle_slop=0.0, inter_submodel=False, cache_da=False, status=True): """Hydrogen bond detection based on criteria in "Three-dimensional hydrogen-bond geometry and probability information from a crystal survey", J. Computer-Aided Molecular Design, 10 (1996), 607-622

If donors and/or acceptors are specified (as :py:class:`~chimerax.atomic.Atoms` collections or anything an Atoms collection can be constructued from), then H-bond donors/acceptors are restricted to being from those atoms.

Dist/angle slop are the amount that distances/angles are allowed to exceed the values given in the above reference and still be considered hydrogen bonds.

'cache_da' allows donors/acceptors in molecules to be cached if it is anticipated that the same structures will be examined for H-bonds repeatedly (e.g. a dynamics trajectory).

If 'per_coordset' is True and 'structures' contains a single structure with multiple coordinate sets, then hydrogen bonds will be computed for each coordset.

If 'status' is True, progress will be logged to the status line.

Returns a list of donor/acceptor pairs, unless the conditions for 'per_coordset' are satisfied, in which case a list of such lists will be returned, one per coordset. """

On Jul 1, 2022, at 7:40 AM, Smith, Harper E. via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Hi Shivam,

Just building on Elaine's suggestion, another easy way to loop through the pdb structures is using glob. Something like

import glob from chimerax.core.commands import run for pdb in glob.glob("your_path/*.pdb"): run(session, "open " + pdb) # whatever ChimeraX commands

Best, Harper

From: ChimeraX-users <chimerax-users-bounces@cgl.ucsf.edu mailto:chimerax-users-bounces@cgl.ucsf.edu> on behalf of Elaine Meng via ChimeraX-users <chimerax-users@cgl.ucsf.edu mailto:chimerax-users@cgl.ucsf.edu> Sent: Friday, July 1, 2022 10:30 AM To: Shivam Gupta <shivam-gupta@pharmafoods.co.jp mailto:shivam-gupta@pharmafoods.co.jp> Cc: ChimeraX Users Help <chimerax-users@cgl.ucsf.edu mailto:chimerax-users@cgl.ucsf.edu> Subject: [chimerax-users] scripting to check H-bonds in multiple structures

Hi Shivam, I don't know Python so I can't answer about that part. However, you might be able to do without python, at least if each docked structure is a separate input file.

(1) first figure out what ChimeraX command(s) you want to run on each structure. You would do this by interactively using ChimeraX on one or two example structures, before you try to put commands into a script. Either you can try using the "hbonds" command directly by typing it into the command line, or you can use the H-Bonds GUI interface to choose the options that you want, and then click Apply -- this will show the resulting command in the Log. See: < applewebdata://E8F8D6B9-E1D5-4087-9F9F-0136B6FB9CD4https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/command... https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/commands/hbonds.html__;!!KGKeukY!ywCOj9rScLmdHukt6hZ8NdcEHGq2DWt26v4lvUU-IKf0-0ytADpXYHQiDWrFYuwWlphfimVRCLAgdSQLxB7KhfANTosO49j8cpQ$ > < applewebdata://E8F8D6B9-E1D5-4087-9F9F-0136B6FB9CD4https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/tools/h... https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/tools/hbonds.html__;!!KGKeukY!ywCOj9rScLmdHukt6hZ8NdcEHGq2DWt26v4lvUU-IKf0-0ytADpXYHQiDWrFYuwWlphfimVRCLAgdSQLxB7KhfANTosO_wz-gV4$ >

If each docked structure is a separate input file (e.g. each one is a separate PDB file) then you can try the following two additional steps:

(2) put the ChimeraX command(s) from step (1) above into a plain text file named something.cxc < applewebdata://E8F8D6B9-E1D5-4087-9F9F-0136B6FB9CD4https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/command... https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/commands/usageconventions.html*cxc-files__;Iw!!KGKeukY!ywCOj9rScLmdHukt6hZ8NdcEHGq2DWt26v4lvUU-IKf0-0ytADpXYHQiDWrFYuwWlphfimVRCLAgdSQLxB7KhfANTosOYOFuYC0$ >

(3) use the "open" command to run the .cxc file and its "forEachFile" option to specify looping through all the PDB files. For an example, see: < applewebdata://E8F8D6B9-E1D5-4087-9F9F-0136B6FB9CD4https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/command... https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/commands/open.html*forEachFile__;Iw!!KGKeukY!ywCOj9rScLmdHukt6hZ8NdcEHGq2DWt26v4lvUU-IKf0-0ytADpXYHQiDWrFYuwWlphfimVRCLAgdSQLxB7KhfANTosO3bQNjp4$ >

However, if all the dockings are together in a single big file you may instead need to use python to loop through them as models (e.g. #2.1, 2.2, 2.3, etc.) and run the command(s) from step (1) above. Somebody else would have to advise on that.

I hope this helps, Elaine

---

Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

...

On Jun 30, 2022, at 10:31 PM, Shivam Gupta via ChimeraX-users <chimerax-users@cgl.ucsf.edu mailto:chimerax-users@cgl.ucsf.edu> wrote:

Hello Chimera Team,

I want to explore the possibility of checking the protein-protein interaction (hydrogen bond) in the docked structure using python script.

Is it possible to check hydrogen bonds for high throughput data (docked protein structures) using Python?

Please guide me over this.

Thanks

---

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