It is relatively common for protein crystals to crystallize with more than a single molecule per asymmetric unit, which could lead to various pathological conditions. Under such circumstances, is there a way to distinguish, between NCS and pseudo-symmetry?
Dear Rahul Singh ,
Trying not to belong, generic non-crystallographic symmetry is a local phenomenon, generally approximate, not been in general case periodically repeated.
By another hand, pseudo symmetry is a global phenomenon, approximate, sometimes misinterpreted as crystallographic symmetry.
Only true crystallographic symmetry is represented by exact crystallographic rules as a global phenomenon.
The rules repeated all over the space covered by the measurement, as predictable crystal relationships.
Crystallographic translation modes the crystal behavior by symmetric relations, the pseudo-translation is local, may not repeat along with the space.
When present, pseudo-translation increases the fraction of weak reflections in diffraction images.
I hope it is useful
Best regards,
WNM
The pseudo-symmetry in crystallography is the higher symmetry that appears or experimentally observed where as .Non-crystallographic symmetry arises when there are multiple copies of a molecule with the asymmetric unit of the crystal.
Hi Dr Rahul Singh . See the following useful RG link : Article Surprises and pitfalls arising from (pseudo)symmetry
Kindly see also the following useful RG link: Article Non-crystallographic symmetry of crystal of neutral phosphol...
Thanks, everyone.. Wagner Da Nova Mussel Aref Wazwaz Madhukar Baburao Deshmukh
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