Alternate locations

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Some PDB files have alternate locations (altlocs) for some atoms. Each atom that has altlocs is marked with an altloc identifier, typically A and B.

The OCA Database and Browser highlights the structure with the most 'altlocs'. See Believe It or Not! within Proteopedia for that Protein Data Bank entry and other information mined from OCA.

The altloc identifier occupies the 17th column for the ATOM records section of the PDB format.


It looks like in the mmCIF format correspondence may be 'alt_id'. However, because that is listed as corresponding to 'alt_loc' , it is unclear if that is the same as 'altLoc' listed in the PDB format guide.

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Proteopedia Page Contributors and Editors (what is this?)

Wayne Decatur

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