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Computationally restoring the potency of a clinical antibody against Omicron. Desautels TA, Arrildt KT et al. Nature. 2024 May 23;629(8013):878–885.

Mechanism of single-stranded DNA annealing by RAD52-RPA complex. Liang CC, Greenhough LA et al. Nature. 2024 May 16;629(8012):697–703.

Structural and functional characterization of the interaction between the influenza A virus RNA polymerase and the CTD of host RNA polymerase II. Keown J, Baazaoui A et al. J Virol. 2024 May 14;98(5):e0013824.

Structures and activation mechanism of the Gabija anti-phage system. Li J, Cheng R et al. Nature. 2024 May 9;629(8011):467–473.

Nanobody repertoire generated against the spike protein of ancestral SARS-CoV-2 remains efficacious against the rapidly evolving virus. Ketaren NE, Mast FD et al. eLife. 2024 May 7;12:RP89423.

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May 10, 2024

The ChimeraX 1.8 release candidate is available – please try it and report any issues. See the change log for what's new.

January 22, 2024

ChimeraX 1.7.1 is available, with fixes for a few miscellaneous bugs that were identified after the 1.7 release.

December 19, 2023

The ChimeraX 1.7 production release is available! See the change log for what's new. Future Mac releases will require macOS 11 or higher.

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UCSF ChimeraX

UCSF ChimeraX (or simply ChimeraX) is the next-generation molecular visualization program from the Resource for Biocomputing, Visualization, and Informatics (RBVI), following UCSF Chimera. ChimeraX can be downloaded free of charge for academic, government, nonprofit, and personal use. Commercial users, please see ChimeraX commercial licensing.

ChimeraX is developed with support from National Institutes of Health R01-GM129325, Chan Zuckerberg Initiative grant EOSS4-0000000439, and the Office of Cyber Infrastructure and Computational Biology, National Institute of Allergy and Infectious Diseases.

Feature Highlight

simple lighting soft lighting

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.

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Example Image

The Human Ribosome

The architecture of the human ribosome has been determined at near-atomic resolution by electron microscopy (Anger et al., Nature 497:80 (2013)). The structure, comprising 82 proteins and five RNA molecules, is shown with shadows cast from all directions to accentuate depth. In the background are schematic representations of contacts between the component molecules.

See the image setup script card.cxc using the 'Tis the Season color palette (credit to MrsP). See also the RBVI holiday card gallery.

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