There are many different software tools available to visualize and sometimes to edit protein structure files, eg. in PDB format. I am working on a protein with close to 1900 amino acids. I have tried Pymol but it does not display the features visibly. I am using a Windows PC.
What do you mean by "I have tried Pymol but it does not display the features visibly"? The size should not be the problem, as I have successfully displayed entire virus capsids and superpositions of hundreds of structures in PyMol. What features are you trying to display? If the information is in the coordinate file, you can get PyMOL to display it - however, you may need to learn how to do it. There is a limited repertoire of automated display modes, for more specialised visualisation of specific features, you have to learn the commands needed to specify what exactly you want to see.
The same is true for any other visualisation program. You might want to try ChimeraX (https://www.cgl.ucsf.edu/chimerax/), which like its predecessor UCSF chimera is quite good at handling large structures (see https://www.cgl.ucsf.edu/chimerax/docs/videos/), but again you will have to learn how to build up the specific representation that best displays the features of your protein you wish to highlight.
Dear Robert Adamu Shey
One of the best protein structural viewers for viewing big protein structures on a Windows PC is UCSF ChimeraX. UCSF ChimeraX was created especially for handling huge molecular structures, including proteins with a lot of amino acids.
Satyendra
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