[phenixbb] change sigma for an already restrained bond
Jorge Iulek
iulek at uepg.br
Fri Apr 12 12:45:58 PDT 2024
Dear all,
I would like to change the sigma value for an already restrained bond.
I enter for phenix.refine:
"
bond {
action = add delete *change
atom_selection_1 = chain D and resid 493 and name CA
atom_selection_2 = chain D and resid 493 and name CB
symmetry_operation = None
distance_ideal = 1.532
sigma = 1.02e-2
slack = None
limit = -1.0
top_out = False
}
"
In the log I get:
"
...
Custom bonds:
bond:
atom 1: "ATOM 14355 CA ALA D 493 .*. C "
atom 2: "ATOM 14358 CB ALA D 493 .*. C "
symmetry operation: x,y,z
distance_model: 1.511
distance_ideal: 1.532
ideal - model: 0.021
slack: 0.000
delta_slack: 0.021
sigma: 0.0102
Total number of added/changed bonds: 1
...
"
But in the .geo file I read:
"
User supplied restraints: 1
Sorted by residual:
bond pdb=" CA ALA D 493 "
pdb=" CB ALA D 493 "
ideal model delta sigma weight residual
1.532 1.511 0.022 1.28e-02 6.10e+03 2.85e+00
"
1.28e-02 is the default value.
On the other hand, sigma changes for angles and dihedrals seem to work
as expected (the intended values are echoed to the .geo file).
To add up, if a bond is *added*, the value is in the .geo file.
I observe this for both
1.20.1-4487
1.21-5207
versions.
So, in short, should I be allowed to *change the sigma* for a specific
*bond*? How should I do it?
Thanks
Jorge
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