From: DeLano, W. <wa...@su...> - 2002-11-27 16:49:13
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Keith, Thank you for bringing this issue to my attention. I can confirm that PyMOL doesn't currently read SCALE records. In order = to generate correct crystal symmetry, it requires the input PDB = coordinates to be properly oriented and translated with respect to the = crystal lattice origin and axes. However, I think this is the default = case with most of the standard refinement programs. At the very least, = PyMOL should print a warning if it finds a SCALE record! I'll see if we can't get SCALE handling in before the next release. Cheers, Warren > -----Original Message----- > From: Keith Refson [mailto:kr...@is...] > Sent: Wednesday, November 27, 2002 7:02 AM > To: pym...@li... > Subject: [PyMOL] Pymol ignores SCALE records in PDB files >=20 >=20 > Just to repeat the subject, it appears that pymol takes no account of > the SCALE records in a PDB file. >=20 > The built in assumptions of the orientation of the unit cell therefore > gives an erroneous relationship between the unit cell and the atomic > co-ordinates. The attached file demonstrates the problem. > "Show->Cell" puts the long dimension of the cell perpendicular to the > line of the atoms, rather than collinear with them as it ought to be. > More seriously then, "symexp" gives a completely wrong expansion. >=20 > HEADER UNKNOWN > TITLE > AUTHOR GENERATED BY XX2PDB (Keith Refson, 1998) > CRYST1 5.024 5.024 5.024 39.69 39.69 39.69 P 1 > SCALE1 0.338511 0.000000 0.072121 0.00000 > SCALE2 -0.169255 0.293159 0.072121 0.00000 > SCALE3 -0.169255 -0.293159 0.072121 0.00000 > HETATM 1 H00 NON A 1 0.000 0.000 6.933 1.00 =20 > 0.00 H > HETATM 2 F00 NON A 1 0.000 0.000 5.792 1.00 =20 > 0.00 F > HETATM 3 F00 NON A 1 0.000 0.000 8.073 1.00 =20 > 0.00 F > HETATM 4 Na00 NON A 1 0.000 0.000 0.000 1.00 =20 > 0.00 Na > TER 4 NON A 1 > END >=20 > sincerely >=20 > Keith Refson > --=20 > Dr Keith Refson,=20 > Building R3 > Rutherford Appleton Laboratory > Chilton > Didcot > Oxfordshire OX11 0QX > T: 01235 778023 K.Refson@ > F: 01235 445720 @rl.ac.uk >=20 >=20 >=20 > ------------------------------------------------------- > This SF.net email is sponsored by: Get the new Palm Tungsten T=20 > handheld. Power & Color in a compact size!=20 > http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0002en > _______________________________________________ > PyMOL-users mailing list > PyM...@li... > https://lists.sourceforge.net/lists/listinfo/pymol-users >=20 |