Have you tried including a small amount of chymotrypsin? There were quite a few 
papers about this technique 10-15 years ago. It worked for one of our proteins, 
but I'm not sure about its success with complexes.

Good luck, Jon.C.

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-------- Original Message --------
On 27 Jul 2021, 16:54, Rakesh Chatterjee wrote:

> Hi everyone
>
> I was working on a protein complex where one protein binds with the other 
> protein majorly based on its surface charge. The protein complex yields nice 
> crystals but does not diffract. Additionally the crystals used to dissolve 
> within the drop when allowed for incubation both at 18 degrees and 4 degrees. 
> Repeated rMMS microseeding, construct variations and changes in purification 
> strategies did not yield any diffractions. Conditions involved for the 
> protein complexes primarily involved PEG with various strengths and pH 
> variations. Looking for your suggestions and valuable ideas
>
> Thanks in advance
>
> Dr Rakesh Chatterjee
> Umea University
> Umea Sweden
>
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