And the resolution of your data is... ?

On Mon, 2012-03-26 at 19:58 +0100, Alok Shenoy wrote:
> Hello,
> 
> I'm working on a structure using coot, and I have a peculiar problem. 
> Searching www didn't quite provide me with an answer, hence requesting more 
> knowledgeable users for some help.
> 
> Background: 
> The structure has 2 chains, Chain A and Chain B. Chain B has all the residues 
> that should be present according to our sequence, and the numbering on both 
> chains are complete.
> 
> Problem:
> 1) Chain A has a couple of residues missing. The numbering shows 231 232 234. 
> Clearly marking out the spot where the residue is missing. Sequence shows 
> that there is an aspartic acid missing in position 233. Problem is - both 232 
> and 234 are connected quite normally, inserting a terminal residue at 232 
> (alanine at first) results in absolutely weird connections. Deleting specific 
> atoms in the backbone on the protein at that position (between 232 and 234) 
> don't quite help either - as that results in 234 missing a peptide bond. 
> 
> 2) At some points, there is no backbone -by which I mean - lets say residue 
> 100 and 101 side chains are showing up (and have appropriate electron 
> density). What is missing is the peptide bond that connects these two 
> residues (again - electron density for the backbone is present). Is there a 
> way to fix this?
> 
> Can someone walk me through the solution to this problems? 
> 
> 
> Thank You,
> 
> Alok Shenoy

-- 
Oh, suddenly throwing a giraffe into a volcano to make water is crazy?
                                                Julian, King of Lemurs

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