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R vs Rfree in simulated annealing refinement

Pedro M. Matias matias at itqb.unl.pt
Tue Oct 22 07:52:30 EST 1996

Hi all.

We had a strange thing happening in one of our protein structure
refinements using X-PLOR 3.1 (2.5 A data):
The model was first refined as a rigid body, and both R and R-free
converged to about 31 %
When we applied the SA protocol (3000K) the Rfree ended up at
35% while the R-factor dropped to 27%.
Does this make sense ???


Pedro Matias

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