A brief reflection on IDPs


Increasingly, people with a computer science background are analyzing the
data deposited in the Protein Data Bank. In the case of conformation
disorder analyses, they consider residues that are explicitly stated to be
disordered (the old REMAR 465 records). This is not quite correct as there
are two problems.

- The first is that some crystallographers consider “visible,” and deposit
their coordinates, even amino acids that have stratospheric B-factors, so
large as to indicate that those amino acids are definitely “invisible” in
electronic density maps.

- The second problem has to do with crystallographic resolution. The amount
of “invisible” amino acids increases as the crystallographic resolution
decreases. At low resolution, electron density maps are often not very
detailed, and some parts of them cannot be interpreted. But this does not
mean that the amino acids found there are definitely “invisible.” It simply
means that resolution might be insufficient.

Editors and reviewers may find it useful to keep these considerations in
mind when evaluating articles on conformational disorder submitted by
scientists that lack a structural biology background. Or is there something
else that can be done?

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