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Structural basis of odorant recognition by a human odorant receptor. Billesbølle CB, de March CA et al. Nature. 2023 Mar 23;615(7953):742–749.

Structures of BIRC6-client complexes provide a mechanism of Smac-mediated release of caspases. Hunkeler M, Jin CY, Fischer ES. Science. 2023 Mar 17;379(6637):1105-1111.

Blebs promote cell survival by assembling oncogenic signalling hubs. Weems AD, Welf ES et al. Nature. 2023 Mar 16;615(7952):517-525.

Coordination of bacterial cell wall and outer membrane biosynthesis. Hummels KR, Berry SP et al. Nature. 2023 Mar 9;615(7951):300–304.

Architecture of chloroplast TOC-TIC translocon supercomplex. Liu H, Li A et al. Nature. 2023 Mar 9;615(7951):349–357.

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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.

December 20, 2022

Brought to you by the Brown Lab at Virginia Tech: ChimeraX Tutorial: Making a Holiday Tree!

November 23, 2022

The ChimeraX 1.5 production release is available! See the change log for what's new.

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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

smoothed (tan) vs. unsmoothed (blue)

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.

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Example Image

photosynthetic reaction center

Photosynthetic Reaction Center

The photosynthetic reaction center from a purple sulfur bacterium is shown as a cartoon with “tube” helices and membrane boundaries from the OPM database (Orientations of Proteins in Membranes, entry 1eys). Blue and red balls represent the cytoplasmic and periplasmic sides of the bacterial inner membrane, respectively. The title and other text labels were added with the 2dlabels command and repositioned interactively with the move label mouse mode . ChimeraX session file: prc.cxs

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