ERRAT is a protein structure verification algorithm that is especially
well-suited for evaluating the progress of crystallographic model
building and refinement. The program works by analyzing the
statistics of non-bonded interactions between different atom types.
A single output plot is produced that gives the value of the
error function vs. position of a 9-residue sliding
window. By comparision with statistics from highly refined structures,
the error values have been calibrated to give confidence limits.
This is extremely useful in making decisions about reliability.
For more information on the program
click here or refer to the
by Colovos and Yeates.
The coordinates should be submitted in PDB format.
To submit a crystal structure for analysis, simply select
it with the file dialog which is activated by clicking on the Browse
button below, then click the Send File button and away we
File must be ASCII and cannot be in any compressed form, gzipped or otherwise
ERRAT takes just a couple of seconds to run and finish.
If it takes longer than about 10 seconds, it is hanging and is most likely due to problems
with the input file that were difficult to correct.
If it hangs, please contact us holton at mbi.ucla.edu so that we
can look into the problem in order to provide a fix for the future.
A couple of most recent problems include