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This tutorial was last updated on 02-03-2026. <br>
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## Introduction
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### C82 AlphaFold model
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The C82 AlphaFold model can be accessed [here](https://alphafold.ebi.ac.uk/entry/A0A816BHH4){:target="\_blank"}.
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The C82 AlphaFold model can be accessed [here](https://alphafold.ebi.ac.uk/entry/P32349){:target="\_blank"}.
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<aclass="prompt prompt-info">
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Inspect the 3D model and in particular the color-coding which indicates the model confidence.
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<detailsstyle="background-color:#DAE4E7">
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<summarystyle="font-weight: bold">
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<i>See the AlhpaFold model and PAE plot</i>
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<i>See the AlphaFold model and PAE plot</i>
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<br>
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</summary>
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<figurealign="center">
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<detailsstyle="background-color:#DAE4E7">
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<summarystyle="font-weight: bold">
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<i>See the AlhpaFold model and PAE plot</i>
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<i>See the AlphaFold model and PAE plot</i>
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<br>
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</summary>
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<figurealign="center">
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<detailsstyle="background-color:#DAE4E7">
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<summarystyle="font-weight: bold">
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<i>See the AlhpaFold-multimer PAE plot</i>
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<i>See the AlphaFold-multimer PAE plot</i>
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<br>
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</summary>
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<figurealign="center">
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<detailsstyle="background-color:#DAE4E7">
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<summarystyle="font-weight: bold">
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<i>See the AlhpaFold model and PAE plot</i>
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<i>See the AlphaFold model and PAE plot</i>
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<br>
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</summary>
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<figurealign="center">
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PowerFit is open-source and available for download from our [Github repository][link-powerfit]{:target="_blank"}.
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To facilitate its use, we have developed a [web portal][link-powerfit-web]{:target="_blank"} for it.
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The server makes use of either local resources on our cluster, using the multi-core version of the software, or GPGPU-accelerated grid resources of the
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The server makes use of either local resources on our cluster, using the multi-core version of the software, or GPU-accelerated grid resources of the
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[EGI](https://www.egi.eu){:target="_blank"} to speed up the calculations. It only requires a web browser to work and benefits from the latest
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developments in the software, based on a stable and tested workflow. Next to providing an automated workflow around
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PowerFit, the web server also summarizes and higlights the results in a single page including some additional postprocessing
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On this page, you will find the most relevant information about the server as well as the links to the local and grid versions of the portal's submission page.
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__Note__: The ChimeraX Fit in Map function does not move the model to the density if they are far apart. If this is the case you can first perform a more exhaustive search. Note that this might take a while since it is a large system
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<aclass="prompt promt-pymol">
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fitmap #model inMap #density search 100
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<aclass="prompt prompt-pymol">
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fitmap #model inMap #density search 5
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</a>
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You can now optimize the fit by using the previously described instructions
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<hr>
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### Setting up the full docking run using the cryo-EM fitted and refined core and C82 domains
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We will setup a docking run to model the full complex including some information about the C31 cross-links and the missing two first wHTH domains of C34. For this we will use the PowerFit/Chimera, HADDOCK-refined structure (Core+C82+C34wHTH3) which we have generated as starting point. We will fix those domains in their original positions for the initial rigid-body docking stage and dock the two missing C34 wHTH domains including fragments of C31 for which we have cross-links.
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We will setup a docking run to model the full complex including some information about the C31 cross-links and the missing two first wHTH domains of C34. For this we will use the PowerFit/ChimeraX, HADDOCK-refined structure (Core+C82+C34wHTH3) which we have generated as starting point. We will fix those domains in their original positions for the initial rigid-body docking stage and dock the two missing C34 wHTH domains including fragments of C31 for which we have cross-links.
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Connect to the [HADDOCK2.4 interface](https://wenmr.science.uu.nl/haddock2.4/submit/1){:target="_blank"} of the HADDOCK web server.
<aclass="prompt prompt-info">Select 1F3G and click on the save button</a>
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<aclass="prompt prompt-info">Name your file *e2a_1F3G.pdb*, make sure to select *PDB* as format and note the location of the saved file</a>
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<aclass="prompt prompt-pymol">
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select histidines, resn HIS+NEP<br>
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show spheres, histidines<br>
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show sticks, histidines<br>
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util.cnc<br>
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</a>
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* high quality model: l-RMSD<1Å
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<aclass="prompt prompt-question">
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Q19: What is based on this CAPRI criterion the quality of the best model?
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Q19: Based on this CAPRI criterion, what is the quality of the best model?
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</a>
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**Note:** On some machines the pymol rms_cur command can fail due to a bug in the PyMOL software. In this case you can use the following command instead:
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<aclass="prompt prompt-question">
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Q21: Referring to the article describing the NMR structure of this complex (Wang et al. 2000), next to chemical shift perturbation data, what are the other types of NMR restraints that have been used to calculate the structure of the complex?
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