From: Josh Vermaas (
Date: Mon Jan 31 2022 - 11:43:36 CST

What is your selection for protein? I think contactFreq needs two
arguments, one that is atomselection text that picks out protein, and
another text that picks out the ligand. "Selection for protein" is not
valid atomselection text.


On 1/31/22 11:39 AM, Maryam wrote:
> Hello
> I'd like to find the number of close contacts and contact areas for a
> receptor-ligand interactions. I use the
> source ContactFreq.tcl
> in the TkConsoleĀ and then run
> contactFreq "selection for protein" "selection for ligand"
> but it gives me this error
> atomselect: cannot parse selection text: selection for protein and noh
> and within 4 of (selection for ligand and noh)
> Is there a point I am missing?
> Your help isĀ appreciated.
> Thanks

Josh Vermaas
Assistant Professor, Plant Research Laboratory and Biochemistry and Molecular Biology
Michigan State University;!!DZ3fjg!pe7Lz-6Qsuy_gWQi87O3tLim30tTDPDYEk9olY8g-etwz2cuvpB9sVg9jaVwHAwOGQ$