I am working on a student exercise on lysozyme, file 2LYZ, in which I want the students to see the locations of the helices and sheets in the overall structure. 

To get a view of the beta sheet with clearly visibile H-bonds, I type
wireframe 100;spacefill off
restrict sheet; hbonds calculate; hbonds 40
Then to show where this is located in the molecule I type
select not sheet; wireframe
Now I want to do something similar with one of the helices.  I type
select 5-14
and immediately the H-bonds in the sheet shrink to the narrow default wireframe width.
Typing       select sheet;hbonds 40    will not restore them.
When I type
select 5-14; hbonds calculate; hbonds 40
I see only the narrow H-bonds, and I have no control over their width any more.

Does anyone know why this is happening and how to get around it?

Jeff Cohlberg

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



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