Windows
Compatible Applications
What is a .mmcif file?
File Extension Details
The mmCIF (Macromolecular Crystallographic Information File) format is a standard for representing structural data of biological macromolecules, such as proteins, DNA, and RNA. It was developed by the International Union of Crystallography (IUCr) to overcome the technical limitations of the legacy PDB (Protein Data Bank) format, which featured strict column-width constraints and a maximum limit on the number of atoms and chains it could describe. mmCIF utilizes the Self-defining Text Archive and Retrieval (STAR) syntax, allowing for a highly flexible and extensible dictionary-based structure. This format is now the mandatory standard for depositing structural data into the Worldwide Protein Data Bank (wwPDB) because it can accurately represent massive molecular complexes, such as ribosomes, which exceed the capacity of older formats. Beyond atomic coordinates, mmCIF files store extensive metadata including experimental methods, refinement statistics, chemical descriptions, and biological assembly information. Its machine-readable nature makes it a cornerstone of modern bioinformatics, structural biology, and computational drug discovery, facilitating the automated parsing and analysis of complex three-dimensional biological structures.
Software Compatibility
Programs that can open and work with .mmcif files
macOS
Compatible Applications
Linux
Compatible Applications
Mobile
Mobile Applications
Frequently Asked Questions
About .mmcif files
To open a .mmcif file, you need compatible software. Here are some options:
- PyMOL
- UCSF ChimeraX
- Mol*
To convert a .mmcif file to another format, you can:
- Use compatible software Many programs that open .mmcif files also allow you to save or export them to different formats.
- Try online conversion services: Websites like Zamzar, CloudConvert, or Online-Convert allow you to convert files between different formats without installing software.
- Specialized conversion tools: Search for '.mmcif converter' to find tools specifically designed for this file type.
- Verify the file extension is correct:
- Update your software:
- Try alternative software:
- Check for file corruption:
Like any file type, .mmcif files can be safe or potentially risky depending on their source:
- Always scan files with antivirus software before opening
- Keep your operating system and applications updated.
- Be especially cautious with executable file types
Chat with AI about .mmcif files
Suggested Questions