Coot is a toolkit for Macromolecular Crystallography and model-building. Coot uses widgets (with the gui builder glade), mmdb, clipper, and OpenGL, together with a new approach to map contouring and importing/creation and other modelling and building operations.
Coot 0.9.8.8 is released today.
Coot Tutorial 2023 Version
Gtk4 Coot Update
After something of a hiatus, I have refreshed my efforts on GTK4-based Coot!
Moorhen is “Coot on the Web”!
Moorhen Tutorial 1: Fix up the Cyclin-Dependent Kinase
Welcome to Moorhen (“Coot on the Web”).
Coot Cryo-EM Tutorial 2022: Part 3
Coot Cryo-EM Tutorial: Part 3: De Novo Model-Building
Coot Cryo-EM Tutorial 2022: Part 2
Coot Cryo-EM Tutorial: Part 2: Molecular Extraction
It’s time to talk about libcootapi.
Coot Graphics Tutorials
Lucrezia Catapano has made some introductory tutorials for Coot 1.
Coot Cryo-EM Tutorial 2022: Part 1
Coot Cryo-EM Tutorial: Part 1: Using An AlphaFold2 Model
GTK4 Coot Progress
So the way forward for Coot on MacOS is to use GTK4 (instead of Gtk3) for the GUI. And that means a whole nother rewrite. Oh boy. Oh well, in we go then (I had known that GTK4 was in Coot’s future because it’s the route to Vulkan and all those new graphical goodies you can do on the graphics card now, but had not planned to start on it for a few years).
Coot 1 on MacOS
The release of Coot 1 was met with some enthusiasm from MacOS users. The Homebrew formula for Coot, written by Yoshitaka Moriwaki was very helpful to that end.
Coot 1 Released
We are pleased to (at last) announce the release of 0.9.7
Coot-0.9.6 was released 2nd July 2021.
New Coot Tutorial Videos
I have recently added 4 videos to my YouTube channel. They cover how to do the first/basic/introduction tutorial and then how to set up your Coot for more advanced usage:
I am pleased to announce the release of Coot 0.9.5
I have added a means to dynamically change the weights during real space refinement (as the molten zone/moving atoms are being displayed)
Coot Goes Nuclear
I’ve recently updated Coot so that it preferentially uses nuclear distances for bond lengths.
Coot Speedrun Map 2
Coot Speedrun Map 2 is a step up from Map 1. The goal is to create, using de novo model-building, an accurate and full atomic model for a cryo-EM reconstruction.
I fumbled the release of 0.9.4, as I was preparing the binaries I found a critical bug. So, I’ve made 0.9.4.1 a few days later. Today, that is. Here’s the combined release notes:
Here’s a bit of holiday fun: A Coot Speedrun! Pit your Coot skills against the rest of the world!
Release 0.9.3 of Coot is now available. This fixes the Colour-by-chain colours and (perhaps more importantly) fixes the problem apparent when using mmCIF files for backup/undo/redo.
This is a bug-fix release, I’d made of a mess of “colour by B-factor” colouring. This releases fixes most of that.
Nature Front Cover Image
My colleagues recently published a paper (Nakane et al. (2020) “Single Particle cryo-EM at atomic resolution”) and asked me to make a figure. I did so and it is this week’s front cover image.
Coot Cryo-EM Tutorial 2: Fitting and MutatingBy Ana Casañal & Paul Emsley
This tutorial is designed for 0.9.1 or later.
Coot Cryo-EM Tutorial 1: BasicsBy Ana Casañal & Paul Emsley
This tutorial is designed for 0.9.1 or later
Adding in Clustalw2
Clustalw2 has now joined the Coot dependencies - that means that we can use it for alignments locally (yay!) This replaces the need to use MUSCLE on the EBI web server - which causes cut and paste kerfuffle, and that is entirely non-winning at tutorials.
Back to the Sticks
Some people, maybe even myself, don’t much like having atoms in default represention. The can now be turned of globally:
How to Make a Bug Report for Coot
I may have sent you this to this post. It’s because I am bored of typing out basically the same message every week for the last several years.
When Graphics Go Wrong: Eye-Catching or Funny Screenshots of Incorrect Geometry
I find myself spending quite a lot of time working on the graphics system of Coot-0.9.9. There is (or has been) a lot of graphics infrasture to write/re-write/update and as I am no graphics expert, there have been many errors along the way. Some of them amused me and so I reproduce them here. Some of them are the “unselected” from a group of related images.
Molecular architecture of the SARS-CoV-2 virus Image
Sai Li and co-workers (not least of whom is Max Crispin, a recent co-author of my own) published “Molecular architecture of the SARS-CoV-2 virus” in Cell today: https://t.co/pQAbjhGh2V
Making a Link with Coot and Acedrg
Coot makes use of the CCP4 Program “Acedrg” to make links between ligands and proteins.
The Coot Utility Refinement Library Extension Wrangler (Curlew) is, the means by which one can easily install extensions.
Density Fit Graph Scale
A long-requested feature has now (eventually) been implemented. The scale for the density fit graph is now easy to find:
Turn off Missing-Residue Loops
It turns out the the missing-residue loops feature was not found to be desirable by everyone - including bucanneer users.
Waters and ions are now drawn with a larger radius than atoms in residues.
Backup file-names for Windows
I have heard reports from Windows users that their backup file names fail to be written out. I think that this is because there are colons in the file name. To prevent this, use the following setting:
Protein Representation has Bond Orders
Bond orders for protein have been enabled in Colour-by-chain mode (0.9.1-pre). I am not sure that I like it yet.
Coot Python API
Compression of Backup Files
Sometime Coot reports that it fails to compress the backup files in the coot-backup directory. This might be, perhaps, because the full path of the directory contains a space. In such a case you can turn off the backup compression:
'Too Long' CA-CA distance loop markup
At the request of John Berrisford and Oliver Clarke, I have changed the representation of loops where the inter-residue number difference is too short for the actual distance between the residue - to say it another way, there are not enough residues in the sequence to span the gap.
Hamish has recently made a demonstration video for CootVR. Slightly non-optimal video and audio, but interesting.
New Ramachandran Plot
The data for the Ramachandran Plot in Clipper have been updated to Top8000 and these are now used in Coot. Here is an example of the atom selection in use and a plot for the Pre-PRO residue type.
Missing Loops in CA Mode
Coot now displays missing loops with dotted lines when in CA Mode:
Models with Duplicate Residue Numbers are Now Allowed
I have now enabled the reading of models with duplicate residue-numbers and insertion codes for different residues by default.
The Coot Spin Test
- Open a new coot, with no state script
Burn-up for 0.8.9.2 Converges
Yay, bug fix list emptied - Here is the progress over the last couple of months:
Variable Bond Thickness
Now we can render our model molecules with “variable” bond thickness, so that molecules that are further away have thinner bond widths (and as we zoom in, they get thicker). You might call this “Natural” Bond Width Mode.
Headless N-linked CHO
Now you can build N-linked carbohydrate without a gui:
Raster3D Output has Atom Labels
So now we have labels, thanks to a request from Vito Calderone.
Post-Madrid Burn-up State
We were looking like a release was imminent. But now, post-Madrid, there is more work to do.
User-defined Unimodal Torsion Restraints
Planar Peptide Restraints added for PTRANS
Trans Proline links (PTRANS) now have planar peptide restraints applied by default.
Link info in Header Browser
The LINK records are now represented in the header browser:
CootVR at Keele University
CootVR was demonstrated to the public for the first time at the CCP4-EM Meeting at Keele University on the 11th April 2018.
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