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Dear Eike,

depending on what your structure is - you can try interface search in
PISA (google on "ebi pisa"). Select the most "representative" interface
in your complex (the one that makes the non-standard arrangement) and
see whether there are similar interfaces in the PDB. It shouldn't be
a too long list, you may then shorthen it to structures with given
oligomeric state and finally check them by eye.

Cheers,

Eugene.

On Mon, 15 Jun 2009, Eike - Christian Schulz wrote:

> Dear All,
>
> I solved a structure that has a very common tertiary structure motif but it
> appears as if the arrangement of the monomers is somewhat Œnon-standart¹.
>
> Of course I performed a DALI search, which resulted in a great number of
> hits  due to the similarity of the tertiary structure (Z¹s: 250 >8; 100 >
> 10).
>
> In order to  check whether this arrangement that I see is something new I
> would like to perform a quaternary structure comparison. Is there any such
> tool available? A Google search wasn't very conclusive. Or is there a clever
> combination of available resources?
>
> Kind regards
>
>    Eike
>