Just use dssp and cite it. For cartoon figures, if you provide a disclaimer, it 
doesn't hurt to tweak it a bit to make it look better.

The idea is that readers are supposed to know that a protein doesn't really 
look like a cartoon--and those who don't understand the distinction probably 
won't have enough knowledge to have an opinion about your assignments anyway.

James



On Apr 8, 2011, at 9:19 AM, Cale Dakwar wrote:

> Hello all,
> 
> Given a PDB file of a newly solved protein structure, what is the standard 
> procedure for assigning regions of secondary structure?  And by this I mean 
> to ask, how does one decide which residues form beta strands, which alpha 
> helices, and so on?  Is DSSP sufficient for this?  Are we supposed to 
> manually walk through the entire molecule and assign secondary structure as 
> we deem appropriate based on hydrogen bonding behaviour?  Some other 
> procedure?  And what of structures solved to ~2.7 A (or worse) where we can't 
> be sure of H-bonding.
> 
> Cheers,
> Cale

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