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Cat1 forms filament networks to degrade NAD+ during the type III CRISPR-Cas antiviral response. Baca CF, Majumder P et al. Science. 2025 Jun 12;388(6752):eadv9045.

Swinging lever mechanism of myosin directly shown by time-resolved cryo-EM. Klebl DP, McMillan SN et al. Nature. 2025 Jun 12;642(8067):519–526.

Structural insights into chromatin remodeling by ISWI during active ATP hydrolysis. Sia Y, Pan H et al. Science. 2025 Jun 5;388(6751):eadu5654.

Identification of covalent inhibitors of Staphylococcus aureus serine hydrolases important for virulence and biofilm formation. Upadhyay T, Woods EC et al. Nat Commun. 2025 May 30;16(1):5046.

Wastewater sequencing from a rural community enables identification of widespread adaptive mutations in a SARS-CoV-2 alpha variant. Conway MJ, Novay MP et al. Sci Rep. 2025 May 28;15(1):18657.

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March 6, 2025

Chimera production release 1.19 is now available, fixing the ability to fetch structures from the PDB (details...).

December 25, 2024

The RBVI wishes you a safe and happy holiday season! See our 2024 card and the gallery of previous cards back to 1985.

October 14, 2024

Planned downtime: The Chimera and ChimeraX websites, web services (Blast Protein, Modeller, ...) and cgl.ucsf.edu e-mail will be unavailable starting Monday, Oct 14 10 AM PDT, continuing throughout the week and potentially the weekend (Oct 14-20).

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Please note that UCSF Chimera is legacy software that is no longer being developed or supported. Users are strongly encouraged to try UCSF ChimeraX, which is under active development.

UCSF Chimera is a program for the interactive visualization and analysis of molecular structures and related data, including density maps, trajectories, and sequence alignments. It is available free of charge for noncommercial use. Commercial users, please see Chimera commercial licensing.

We encourage Chimera users to try ChimeraX for much better performance with large structures, as well as other major advantages and completely new features in addition to nearly all the capabilities of Chimera (details...).

Chimera is no longer under active development. Chimera development was supported by a grant from the National Institutes of Health (P41-GM103311) that ended in 2018.

Feature Highlight

dopamine receptor with axes and planes

Axes and Planes

Axes, planes, and centroids can be calculated from sets of atoms using the Axes/Planes/Centroids tool or the command define. Axes can be shown as cylinders, planes as disks, and centroids as spheres, and any of these can be used in distance and angle measurements.

For example, the figure shows the dopamine D3 receptor and bound inhibitor (PDB entry 3pbl) as modeled into the membrane in the OPM database. The planes of the inner and outer membrane boundaries are shown as transparent blue and red disks, respectively. The protein ribbon is rainbow-colored from blue at the N-terminus to red at the C-terminus, and the axis of each helix is shown as a cylinder of matching color. The axis of the red helix forms an angle of 15.1° with the membrane and comes within 3.5 Å of the inner boundary. The yellow and orange helices are nearly antiparallel (crossing angle 5.9°). The average (minimum, maximum) distance of inhibitor atoms from the outer boundary is 7.9 (5.1, 11.7) Å.

(More features...)

Gallery Sample

Binding Site Similarity

β-1,4-glycanase (gold, PDB 1exp) and cellobiohydrolase I (cyan, PDB 1cel) have similar glucose-binding sites but different folds. Ribbons were slimmed with Ribbon Style Editor and the title and captions were added with 2D Labels (see image how-to). (More samples...)


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