The distance to your modelled water seems to be in agreement with an
ionic interaction. What are the components of all buffers in the
crystallisation components ?
Fred.
ruheng wrote:
> Dear all,
>
> Recently we are working on an archaebacteria protein which was
> expressed and purified from /E.coli /by conventional procedures. After
> we solved the structure, we found that there is an extra density in
> one of the argninine as shown in the attached picture. It seems that
> the density is larger than a methyl group and the atoms in the density
> are not on one plane. So we are curious about whether the density is a
> kind of posttranslational modification of arginine residues in the
> protein, if it is, what kind of modification could it be? And most
> important, what is the biological significance of this kind
> modification? Any suggestions and dicussions are appreciated!
>
> Best,
> Heng
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> Strange density in arginine
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