Hi

A simple-minded approach might be to calculate the principal components (e.g. 
in Python use scikit-learn) and construct an enclosing box that would be big 
enough to contain the model completely. Shouldn’t be more than about a dozen 
lines of Python including IO?

There are probably better tools.

Harry

> On 10 Nov 2025, at 06:28, Zhang Xin 
> <[email protected]> wrote:
> 
> Dear all,
> 
> I would like to ask a brief question.
> When only an AlphaFold-predicted PDB model is available and no diffraction 
> data yet, is there any existing tool to estimate a reasonable unit cell 
> (assuming space group P1)?
> 
> If there are recommended tools or common practices for this, I would 
> appreciate any suggestions.
> 
> Best regards,
> Xin
> 
> 
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