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Featured Citations

Convolutional neural networks for automated annotation of cellular cryo-electron tomograms. Chen M, Dai W et al. Nat Methods. 2017 Oct;14(10):983-985.

PDB-Dev: A prototype system for depositing integrative/hybrid structural models. Burley SK, Kurisu G et al. Structure. 2017 Sep 5;25(9):1317-1318.

Atomic structure of Hsp90-Cdc37-Cdk4 reveals that Hsp90 traps and stabilizes an unfolded kinase. Verba KA, Wang RY et al. Science. 2016 Jun 24;352(6293):1542-7.

Structure and membrane remodeling activity of ESCRT-III helical polymers. McCullough J, Clippinger AK et al. Science. 2015 Dec 18;350(6267):1548-51.

See also RCSB PDB images...

News

October 3, 2017

A third alpha release is available. See the change log listing salient changes and when they occurred.

August 15, 2017

A second alpha release is available. To help users decide when to update, we have created a change log listing some of the more significant changes and when they occurred.

July 18, 2017

Our ChimeraX paper is accessible online! UCSF ChimeraX: Meeting modern challenges in visualization and analysis. Goddard TD, Huang CC et al.. Protein Sci. 2017, in press.

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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 licensing.

ChimeraX development is funded by the National Institutes of Health (NIGMS P41-GM103311).

Feature Highlight

2ptt interchain H-bonds screenshot

Interactive H-Bond Histogram

Hydrogen bonds (H-bonds) can be identified with the command hbonds and plotted as an interactive histogram with the command crosslinks 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...

Example Image

cyclodextrin pore

Cyclodextrin Pore

The outer-membrane protein CymA admits bulky molecules into the periplasmic space of Klebsiella oxytoca. Here, CymA (PDB 4d5d chain A) is depicted in a style reminiscent of a diagnostic X-ray, with transparent molecular surface and β-strand “ribs” in white. The protein has ingested α-cyclodextrin (top) and β-cyclodextrin (bottom), bound at the entry site and near the exit, respectively. Cyclodextrin carbon atoms are shown in blue-gray and oxygen atoms in brick red. For image setup other than orientation, see the command file xray.cxc.

More images...