Bob wrote:

> Neither of these solutions is impossible. I propose we implement the
> second -- a ribbon associated with carbohydrates. Jmol already identifies
> chains of carbohydrates and can show a trace through the anomeric carbon
> atoms. 

Wow, I didn't know that ribbons were already implemented for carbohydrates! 
This makes my 
efforts to draw curves unneccesary.

On models with straight amylose helix (30 to 100 residues), ribbons are already 
quite 
adequate, at least in this PDB model where all the C1 atoms are correctly 
labeled. Some 
funny effects at seen at spots, but I need to check if the atoms are properly 
labeled before I 
complain.


> What is needed to make ribbons would be to identify the second
> atom. This could be easy or difficult, depending upon how that is defined.
> Can you tell us what you would use to define the ribbon? Once we have
> that, it is possible that this could be implemented very easily.

Right now the orientation of the ribbon is OK (tangent to the helix). I will 
have to look at other 
models that are not so regular and have other monosaccharides than glucose.
Will come back to this when I have some hints.
(I'm leaving for vacation this afternoon)


> If you will work with me and have a good idea of

This can be a promising starting point. Some people have published two nice 
algorithms for 
cartoon-type rendering of carbohydrates, implemented in their own software and 
on the way 
to get implemented in VMD. I have already talked to them about the possibility 
to add that to 
Jmol. If we have a simple ribbon already worked out, it will help future work 
for the more 
sophisticated renderings.




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