Adjustable β-Strand Smoothing
Cartoon ribbons are drawn to pass through the exact positions of peptide α-carbons in helix and coil, but by default, strands are smoothed to appear less ripply. This means that α-carbons in strands may not fall on the ribbon. A tether is drawn wherever a sidechain is displayed but would otherwise be detached from the ribbon. (Tether appearance can be adjusted with cartoon tether.)
However, β-strand ribbon smoothing can be tuned continuously between zero (off) and 1.0 (default, fully on), and this can be done for all residues or for specific residues only. The image compares ribbon positions for residues 139 and 164 in the active site of mandelate racemase (PDB 2mnr) with and without smoothing. The unsmoothed position (transparent blue) can be obtained with:
cartoon :139,164 smooth 0
This leaves ribbon smoothing at other residues unchanged. Values between 0 and 1 would give intermediate positions.More features...
Interactive H-Bond Histogram
The ChimeraX graphics window shows the complex between a natural killer cell receptor 2B4 and its ligand CD48 (PDB 2ptt). The receptor protein is blue, the ligand protein pink, and H-bonds between them dashed yellow, with H-bonding residues labeled. Although not done here, the H-bonds could also be labeled by distance.
The histogram of H-bond distances on the top right is interactive: when the cursor is placed over a bar in the histogram, the corresponding H-bonds are temporarily enlarged in the 3D view and the others hidden. For image setup other than orientation, see the command file hb3.cxc.More features...
Interactive Chain Network
Chain-chain interfaces can be identified by buried surface areas and displayed as a network diagram with the interfaces command or the Molecule Display icon . In the diagram, nodes (circles) represent chains, larger for greater surface areas, and edges (lines) between nodes represent chain-chain interfaces (default ≥ 300 Å2 buried area). Dotted lines represent interfaces smaller than half the size of the largest in the structure. Diagram context menus enable a variety of actions, such as “exploding” the structure by moving chains apart, hiding all but the chains in contact with a given chain, and showing a more detailed plot of the residues forming a given interface.
The structure is an HIV envelope glycoprotein trimer bound by three copies of a broadly neutralizing antibody (PDB 5v8m), with chain information shown in the Log. Glycosylations (not displayed) were included in the surface area calculations. For setup, see the command file trimer-network.cxc.More features...
AlphaFold is an artificial intelligence method for predicting protein structures. With the AlphaFold tool or command, ChimeraX can search for and load predicted structures from the freely available AlphaFold Database, automatically coloring them by confidence value:
The figure shows the predicted structure of UniProt entry TOM40_HUMAN, a channel protein needed to import other proteins into mitochondria. See the command file tom40.cxc for fetching data and other setup (background color, etc.).
Opening a sequence from UniProt also opens a dialog in which its annotations or “features” can be clicked to highlight those regions in both the sequence and the associated 3D structure. The low-confidence part of this structure (orange and red) maps to compositionally biased and likely disordered regions near the N-terminus of the sequence.More features...
Coulombic Electrostatic Potential
Coulombic electrostatic potential (ESP) can be calculated and displayed with surface coloring using the command coulombic or the Molecule Display icon . No separate calculation or input ESP file is required. The image shows the first assembly defined for PDB 3eeb, the protease domain of a toxin from Vibrio cholerae, with the default Coulombic coloring: red-white-blue over the value range –10 to 10. For image setup other than orientation, see the command file coulombic.cxc.
For how to add a color key and associated label, see the Protein-Ligand Binding Sites tutorial.More features...
Assemblies from mmCIF Symmetry Information
Multimeric assemblies defined in a structure's mmCIF file are automatically listed when the file is opened and can be reconstituted with the sym command. The complex of selenocysteine synthase and tRNASec (PDB 3w1k) is shown as molecular surfaces of different colors for different chains. The asymmetric unit is on the left and the assembly specified in the mmCIF file is on the right, with arrow and text annotations from 2dlabels. See the command file sym.cxc.
Alternatively, biological assemblies can be fetched by specifying rcsb_bio or pdbe_bio as the source database.More features...
The Matchmaker tool (or matchmaker command) is convenient for superimposing related structures without having to worry about numbering or missing residues. It superimposes proteins or nucleic acids by creating a pairwise sequence alignment, then matching the sequence-aligned residues in 3D. Secondary structure helps guide the sequence alignment for better performance on more distantly related proteins with harder-to-align sequences. By default, the fit is iterated to exclude structurally dissimilar regions and superimpose the most similar parts more closely.
The resulting sequence alignments can be displayed, as in this example of three pectate lyases: PDB 1jta, 1bn8, and 2pec (see the command file peclyases.cxc). In the sequence alignments, residues used in the final fit iteration are enclosed in light orange boxes. RMSD values and other fit statistics are reported in the Log.More features...
Coloring by Sequence Conservation
Atomic structures, including cartoons and molecular surfaces, can be colored by the conservation in an associated multiple sequence alignment. The figure shows a structure of the β2-adrenergic receptor signaling complex (PDB 3sn6) with receptor cartoon colored blue→white→red from least conserved to most conserved. The β2-adrenergic receptor is a member of the class A G-protein-coupled receptor superfamily. Conservation was calculated from a superfamily alignment from PASS2 using the entropy-based measure from AL2CO (included with ChimeraX courtesy of Pei and Grishin). The sequence alignment and step-by-step instructions for making this image are given in the Coloring by Sequence Conservation tutorial.More features...
Front/back (rotatable) clipping can be applied selectively to some models but not others. This is most often used to slice a molecular surface but not the corresponding atomic structure.
For example, the protein in PDB entry 1g74 has an oleic acid residue OLA in an interior pocket. The script in pmc.cxc shows the protein surface, activates front clipping for all models, and then turns it off for just the atomic model, as shown in the figure. The clipping plane can be translated and rotated interactively with the mouse .More features...
Multichannel Light Microscopy
3D images and time series from multichannel optical microscopy are shown in the Volume Viewer tool, with easy access to hiding/showing individual channels, changing their colors, and adjusting threshold levels with the mouse. The menu of style options includes “volume” (translucent blobs, as in the image), surface, mesh, maximum intensity projection, single plane, and orthoplanes. For convenience, the step size, region bounds, and display style of different channels of the same dataset are coupled, in that changing the setting of one channel automatically changes it for the others.
The image shows human induced pluripotent stem cells, with plasma membrane in violet red, EGFP-tagged fibrillarin (as a marker for nucleolus) in yellow, and DNA (nucleus) in turquoise. The data are publicly available from the Allen Cell Explorer website, dataset: AICS-14_0.More features...
ChimeraX virtual reality works with HTC Vive, Oculus Rift, and Samsung Odyssey systems (those supported by SteamVR). Any structures, maps, etc. that can be displayed in ChimeraX can be viewed in the headset and manipulated with the hand controllers. Icon toolbars visible in the headset allow changing the scene display or hand-controller button assignments with a single click. Besides rotation, translation, and zooming, useful functions include labeling, distance measurement, bond rotation, placing markers into a map, and changing map contour levels. Virtual-reality (VR) mode can be turned on and off with the vr command, and the meeting command allows multiple users to share a single session in VR.More features...
Curved Helix Cylinders
Protein α-helices can be shown as curved-cylinder “tubes“ with the cartoon style command. Helix tube mode is an alternative to the standard spiraling ribbons, and both modes are fully integrated with coil and β-strand cartoons. The structure at left is an AMPA-subtype glutamate receptor bound to the antiepileptic drug perampanel (PDB 5l1f). The receptor is tetrameric, and each chain is rainbow color-coded from blue at the N-terminus to red at the C-terminus. Four molecules of perampanel (pink) are bound near the bottom, between the transmembrane domain and the rest of the receptor. For image setup other than orientation, see the command file ampar.cxc.
See also: Presets menuMore features...
Struts for 3D Printing
Structures can be reinforced for 3D printing with pseudobonds. In this DNA-transcription factor complex (PDB 5ego), proteins are shown as ribbons and the DNA as a molecular surface. The pseudobonds in blue were read in from a manually created file, 5ego.pb, and further reinforcements in light gray were added automatically with the struts command. For image setup other than orientation, see the command file struts.cxc.More features...
Rotamers and Swapaa Virtual Mutation
Rotamers is an interface for showing amino acid sidechain rotamers and optionally replacing the original sidechain, also implemented as the swapaa command. The rotamers can be shown all at once, as in the figure, or individually by choosing rows in the dialog.
The figure shows binding-site residues of the thyroid hormone receptor β with hormone bound, PDB 3gws. Rotamers for the hormone-resistance mutations N331H and L346R are shown as partially transparent sticks, with H-bonds (light blue dashed line) and clashes (light purple dashed lines) calculated for the histidine rotamers at position 331. The rotamer-list dialog for this position is also shown. Command script rotamers.cxc contains the initial, noninteractive part of the setup.
These mutations are described in Cardoso et al., Endocrine (2020). Although one histidine rotamer may be able to form the same pocket-stabilizing H-bond as the wild-type asparagine, it also clashes with several atoms (third row in the dialog). H-bonds and clashes are not shown for the arginine rotamers at 346, but they all clash significantly with the hormone and/or other pocket atoms.More features...
A “palette” or ordered series of colors is used to color items sequentially (rainbow) or by values such as density. The ten chains in PDB 5o3l (paired tau filament) have been colored with the commands shown as 2D labels in the images. The first two examples at left use predefined palettes (credit to www.ColorBrewer.org, color specifications and designs by Cynthia A. Brewer, Pennsylvania State University), whereas the third shows specifying colors individually.More features...
Multichain Comparative Modeling
The example shows modeling the human (shades of blue) from the mouse (brown and tan) complex of programmed death-1 (PD-1) with its ligand PD-L2, PDB 3bp5.
Comparative modeling requires a template structure and a target-template sequence alignment for each unique chain. The sequences of human PD-1 and PD-L2 targets were fetched from UniProt and associated with the corresponding chains in the template structure, see model-pdl-setup.cxc. (Pairwise or multiple sequence alignments could have been used, but in this case, the template structure was simply associated with the target sequence.) Sequence-structure association shows mismatches in the Sequence Viewer: pink boxes for sequence differences between mouse and human, and gray outlines around the parts missing from the structure.
Three models were made with with default settings (other than the number of models), and the best-scoring model is shown. Two positions where sequence differences change the interfacial H-bonds are displayed.More features...
Morphing between atomic structures can be calculated wih the morph command and played back in an animation. This movie shows morphing between two conformations of the FGFR1 kinase domain:
- inactive structure (PDB 3c4f, chain A)
- activated structure (PDB 3gqi, chain A) with phosphorylated tyrosines and bound ATP analog
Morphing and other setup was done with the command file kmorph-prep.cxc, followed by interactively positioning the structure and saving the view with the command view name p1 (generally a session would also be saved at this point), then running kmorph-play.cxc to add 2D labels and record the movie.More features...
Coloring by Molecular Lipophilicity Potential
Molecular lipophilicity potential (MLP) can be calculated for a protein and displayed with surface coloring using the command mlp or the Molecule Display icon . The image shows the photosynthetic reaction center from a purple sulfur bacterium, with MLP coloring on the molecular surface and membrane boundaries from OPM (Orientations of Proteins in Membranes entry 1eys). Blue and red balls represent the cytoplasmic and periplasmic sides of the bacterial inner membrane, respectively. Parts of the L, M, and H chains span the membrane, whereas the cytochrome subunit sits on the periplasmic side, at the top. The surface coloring ranges from dark goldenrod for the most hydrophobic potentials, through white, to dark cyan for the most hydrophilic. Ligands including lipid, detergent, heme, and various other cofactors are shown as purple surfaces.
For image setup after the structure from OPM has been opened, see the command file mlp.cxc.More features...
Fitting to Density Maps
Atomic structures and/or maps can be fit rigidly into other maps with the Map icon , the Fit in Map tool, or the fitmap command. A common use is to locally optimize the fit after initial placement by hand. The command includes options for symmetrical and sequential fitting, as well as global search to generate multiple starting points for local optimization.
Elongator is a highly conserved complex that associates with RNA polymerase II during transcriptional elongation. In the image, one of its six subunits, Elp2 (PDB 5m2n), has been fit into a map of the Elp123 subcomplex (EMDB 4151).More features...
Ambient Occlusion Molecular Surfaces
Several lighting modes are available, including ambient occlusion. The image shows hemoglobin (PDB 4hhb) with the four chains shown as surfaces of different colors and heme residues as spheres. The command lighting soft or the Graphics icon can be used to turn on ambient shadowing from 64 directions. The command lighting gentle gives a similar result, except tuned to emphasize larger indentations.More features...
The Presets menu includes a few different combinations of cartoon and nucleotide styles, shown here along with overall settings from the Publication preset plus lighting depthcue false. The style settings of cartoons and nucleotides can be controlled individually (and with many more possibilities than shown here) with cartoon style and nucleotides, respectively. See also: Toolbar nucleotides icons
ribbons/slabs cylinders/stubs licorice/ovals
Different representations of nucleotides can be shown with the nucleotides command or Toolbar icons. Options include filled rings, slabs for bases (box, muffler, or ellipsoid shape), bumps on slabs to show base orientation, simple tubes instead of ribose atoms, and continuous or broken ladder rungs. Nucleotide representations can be the same color as the ribbon or a different color, and multiple nucleotide styles can be used within a single structure.
See also: Presets menuMore features...
cryoEM Ambient Occlusion
A cryoelectron microscopy map of the 26S proteasome (EMD-4321) is shown at the author-recommended contour level in two different lighting modes: “simple” on the left and “soft” on the right. Soft lighting includes ambient lighting and shadowing (occlusion) and can be turned on with the command lighting soft or by clicking the Graphics icon .
For setup of the righthand image, see the command file ambient.cxc.More features...