Have you looked for other possible models in the PDB?
Eleanor

On 21 July 2017 at 02:16, 张士军 <[email protected]> wrote:

> Hi everyone
>
>    I have got a anti-parallel coiled-coil structure in a short fragment
> recently, then I want to solve a longer fragment structure with phenix-MR
> using this short fragment structure as a model.The result is not good
> because of the Rwork and Rfree is high.So I think the longer fragment will
> be parallel coiled-coil which is different with the shorter one. I am
> wondering whether there are any other methods to handle this phenomenon
> besides heavy atom phasing? Thanks a lot!!!
>

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