I'd like to report a bug.  I'm looking at a protein structure:  1RRX.pdb.
(Other structures of this same type exhibit the same problem.)

The following sets it up.

select all;

cartoon on;

wireframe off;

spacefill off;

color cartoon group;

hbonds calculate;

hbonds .1;

What is observed is that the first and last beta-sheet strands have hydrogen
bonds on only one side.  If you spin this slowly about the axis of the
barrel, you can see that the most red and the most blue strands only form
hydrogen bonds to one of their neighbors, instead of to both.

 

Chris 

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