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Recent Citations

Structural basis for inactivation of PRC2 by G-quadruplex RNA. Song J, Gooding AR et al. Science. 2023 Sep 22;381(6664):1331-1337.

Structural basis of mitochondrial protein import by the TIM23 complex. Sim SI, Chen Y et al. Nature. 2023 Sep 21;621(7979):620–626.

Neutralization, effector function and immune imprinting of Omicron variants. Addetia A, Piccoli L et al. Nature. 2023 Sep 21;621(7979):592–601.

A pentameric TRPV3 channel with a dilated pore. Lansky S, Betancourt JM et al. Nature. 2023 Sep 7;621(7977):206–214.

DELE1 oligomerization promotes integrated stress response activation. Yang J, Baron KR et al. Nat Struct Mol Biol. 2023 Sep;30(9):1295-1302.

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April 19, 2023

Chimera production release 1.17.1 is now available, fixing an issue with 1.17 for Windows and Linux. See the release notes for details.

April 13, 2023

Chimera production release 1.17 is now available. Updating is required to keep using the tools that run Blast Protein, Modeller, and multiple sequence alignment with Clustal Omega or MUSCLE, as these will soon stop working in older versions. See the release notes for details.

December 21, 2022

The RBVI wishes you a safe and happy holiday season! See our 2022 card and the gallery of previous cards back to 1985.

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Upcoming Events

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.

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Gallery Sample

Peroxiredoxin Wreath

Peroxiredoxins are enzymes that help cells cope with stressors such as high levels of reactive oxygen species. The image shows a decameric peroxiredoxin from human red blood cells (Protein Data Bank entry 1qmv), styled as a holiday wreath.

See also the RBVI holiday card gallery.

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