Hi all,

We are trying to optimise a histidine interaction where NE2 would ideally make a hydrogen bond with an adjacent tyrosine hydroxyl. The starting point contains the hydrogen bond. However upon refinement the ring flips (chi2 x 180 degrees) to place the CE1 adjacent to the tyrosine hydroxyl.

Is it possible to stop this as I see no reason why phenix.refine would want to do this

Regards

Joel

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Joel Tyndall, PhD

Associate Professor in Medicinal Chemistry
National School of Pharmacy
University of Otago
PO Box 56 Dunedin 9054
New Zealand  

Skype: jtyndall

Ph: +64 3 479 7293