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A MERS-CoV-like mink coronavirus uses ACE2 as an entry receptor. Wang N, Ji W et al. Nature. 2025 Jun 19;642(8068):739–746.

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.

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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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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

mda p08648 limit 4 percent 50

Find and Summarize Structures for a Sequence

One use of Multidomain Assembler is to set up comparative modeling and concatenation of existing structures to generate a full-length model of a multidomain protein. However, even without model-building, the byproduct is also useful: a visual summary of the structures available for a query sequence, optionally filtered by criteria such as BLAST score and % identity, laid out horizontally in approximate N→C order relative to the query. Overlapping hits are stacked vertically, and segments without structural coverage are indicated with spheres. By default, the multiple sequence alignment of the hits to the query is also displayed.

The figure shows the results of command:
    mda p08648 ~/Desktop/MDA limit 4 percent 50
with sequence mismatches in red and molecules other than the hit chains in blue. Text and pointers have been added with 2D Labels.

Multidomain Assembler is described in a paper.

(More features...)

Gallery Sample

Orexin Receptor Complex

The image shows the structure of the human OX2 orexin receptor bound to the insomnia drug suvorexant, Protein Data Bank entry 4s0v. The drug is shown as spheres colored by element, and the receptor as ribbons with secondary structure elements rainbow-colored from blue at the N-terminus to red at the C-terminus. (More samples...)


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