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Proline puckering.

Prolines with funny puckers:

Date= 2011-05-23 14:37:27
Puckering amplitudes for all PRO residues are within normal ranges.
The proline residues listed in the table below have a puckering phase that is
not expected to occur in protein structures. Puckering parameters were
calculated by the method of Cremer and Pople [REF]. Normal PRO rings
approximately show a so-called envelope conformation with the C-gamma atom
above the plane of the ring (phi=+72 degrees), or a half-chair conformation
with C-gamma below and C-beta above the plane of the ring (phi=-90 degrees).
If phi deviates strongly from these values, this is indicative of a very
strange conformation for a PRO residue, and definitely requires a manual
check of the data. Be aware that this is a warning with a low confidence
level. See: Who checks the checkers? Four validation tools applied to eight
atomic resolution structures [REF].

71 PRO ( 71 ) A -116.2 envelop C-gamma (-108 degrees)

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If you have detected any error, or have any question or suggestion,
please send an Email to Gert Vriend.
Roland Krause, Jens Erik Nielsen, Gert Vriend .

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Last modified Mon May 23 14:37:32 2011