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Re: RMSD calculation



Hi,

The log file says that you have 112 CA positions which are superposable
to better than 4.0A and the RMSD over the equivalent positions is
1.3642. 

Eashwar.

Douglas Kojetin wrote:
> 
> Hi-
> 
> I figured out how to get an RMSD fit using the following script (look
> correct?):
> 
> ########################################
> #  RMSD script
> ########################################
> SET OUTPUT_CONTROL = 1 1 1 1 1
> 
> READ_MODEL FILE = 'B99990100'
> SEQUENCE_TO_ALI ATOM_FILES = 'B99990100', ALIGN_CODES = 'B99990100'
> READ_MODEL FILE = '../../atom_files/template'
> SEQUENCE_TO_ALI ADD_SEQUENCE = on, ATOM_FILES = ATOM_FILES 'template', ;
>     ALIGN_CODES = ALIGN_CODES 'template'
> ALIGN GAP_PENALTIES_1D = -600 -400
> ALIGN3D GAP_PENALTIES_3D = 0 2.0
> WRITE_ALIGNMENT FILE = 'B99990100.ali'
> 
> READ_MODEL  FILE = 'sB99990100'
> PICK_ATOMS ATOM_TYPES = 'CA'
> READ_MODEL2 FILE = '../../atom_files/template'
> SUPERPOSE FIT_ATOMS = 'CA'
> ########################################
> 
> This is my output from the .log file
> 
> ########################################
> # output
> ########################################
> Least-squares superposition:
> 
>      PICKed MODEL atoms are used for superposition if
>      they have equivalent atoms in MODEL2
> 
>      Superposition done               :         T
>      Numb of residues in MODEL        :       120
>      Numb of atoms/sel atoms in MODEL :       959      120
>      Numb of residues in MODEL2       :       122
>      Numb of atoms in MODEL2          :       980
>      Equivalences refinement          :         F
>      Numb of aligned equiv positions  :       113
>      Numb of aligned equiv distances  :      6328
>      RMS before superposition         :   44.1902
>      RMS after superposition          :    1.3978
>      DRMS                             :    1.1250
> 
>      Distance cutoff                  :    3.5000
>      Numb of equiv cutoff positions   :       112
>      Numb of equiv cutoff distances   :      6304
>      Cutoff RMS after superposition   :    1.3642
>      Cutoff DRMS                      :    1.1009
> ########################################
> 
> My question is -- what exactly do all the categories/listings mean?  I
> looked (briefly) in the manual for an explanation for each but could not
> find one.
> 
> I guess in a round-about way -- which value should I use for my alpha
> carbon value RMSD when comparing models?
> 
> Many thanks,
> Doug Kojetin
> 
> Bozidar Yerkovich wrote:
> 
> >Hi,
> >
> >Look at MODELLER commands: SUPERPOSE and COMPARE.
> >
> >Good luck,
> >Bozidar
> >
> >
> >
> >On Monday May 20 2002 01:49 pm, Douglas Kojetin wrote:
> >
> >>Hi-
> >>
> >>Will modeller perform a calculation of RMSD (Ca, etc) between the target
> >>and template and output the RMSD?  I'm looking to have a semi-automated
> >>(or automatable) method for doing this (to compare 50+ models at once
> >>quickly).
> >>
> >>Many thanks,
> >>Doug Kojetin
> >>

-- 
Eashwar Narayanan 
Research Associate (Sali Lab)
The Rockefeller University 
1230 York Avenue, New York, NY 10021-6399
Phone: +1 212 327 7757 ; Fax +1 212 327 7540
E-mail: