[Molvis-list] working with a file with two models superimposed

[Jeff Cohlberg]

One of my students is trying to work with file 2CLC, " CRYSTAL STRUCTURE 
ANALYSIS OF A FLUORESCENT FORM OF H-RAS P21 IN COMPLEX WITH GTP (2)" in 
Rasmol.

The file is one of a series from a paper on kinetic studies of a protein 
crystal using a fluorometer combined with X-ray diffraction.  The 
subject is a single polypeptide chain.  The file has two models.  One 
chain is designated Chain X Model 1, and the other Chain X Model 2.  
They have the same sequence and residue numbering.

The images of the structure show two chains not quite superimposed on 
each other.  How can you select one of the two models for display?  The 
command "select :X" selects both models. 

Clicking on an atom for model 1 identifies it as "N ;A 872  Group MET 
111 Chain: X Model: 1"
Clicking on an atom for model 2 identifies it as "N ;B 872  Group MET 
111 Chain: X Model: 2"
Typing "Select :A" or "Select :B" results in no atoms being selected.

Does anyone know how to select and work with a single model (in Rasmol 
or another program)?

Jeff Cohlberg




-- 
Jeffrey A. Cohlberg, Professor
Department of Chemistry and Biochemistry
California State University, Long Beach
Long Beach, CA 90840
562-985-4944		fax 775-248-1263
cohlberg at csulb.edu