NOE data, contact information, and predicted local secondary
structure information of each residue. The local energy minima
are explored with a variant of simulated annealing method. The restraints
from easy-NOE data are referred to as NOE-restraints hereafter.
Flat-bottom restraining functions [18] with soft-square walls
are used as implemented in the CHARMM program [19] (Figure 1a).
The potential wall is a combined function consisting of a quadratic
function and a rational function; left- or right-half of a quadratic
function runs for 3.0 Å, and then it is changed to a rational function.
The second-order derivative for the quadratic part is set to
be 0.5 kcal/mol Å2
. The rest of parameters are used as recommended
in CHARMM manual.