problems with in text mode towards pdf and pdb files

From: Francesco Pietra (chiendarret_at_gmail.com)
Date: Fri Nov 21 2014 - 09:09:52 CST

Hello:
This is to pose two questions:

(1) why certain element symbols are not given by vmd in text mode (ff
charmm36). As far as I can see, this occurs when the atoms already existing
in the input file are renamed by vmd. For example

INPUT file (from very high resol, so also H-atoms)
ATOM 1876 N ILE A 121 18.702 56.325 54.575 1.00 9.97
PRA N
ATOM 1877 CA ILE A 121 19.542 55.205 54.968 1.00 10.09
PRA C
ATOM 1878 C ILE A 121 20.328 54.658 53.776 1.00 9.22
PRA C
ATOM 1879 O ILE A 121 19.781 54.584 52.667 1.00 10.52
PRA O
ATOM 1880 CB ILE A 121 18.662 54.113 55.632 1.00 11.33
PRA C
ATOM 1881 CG1 ILE A 121 19.508 52.942 56.194 1.00 13.73
PRA C
ATOM 1882 CG2 ILE A 121 17.478 53.649 54.787 1.00 15.02
PRA C
ATOM 1883 CD1 ILE A 121 18.648 52.172 57.211 1.00 17.54
PRA C
ATOM 1884 H ILE A 121 18.151 56.223 53.923 1.00 11.97
PRA H
ATOM 1885 HA ILE A 121 20.184 55.525 55.636 1.00 12.10
PRA H
ATOM 1886 HB ILE A 121 18.264 54.544 56.417 1.00 13.60
PRA H
ATOM 1887 HG12 ILE A 121 19.779 52.352 55.473 1.00 16.47
PRA H
ATOM 1888 HG13 ILE A 121 20.306 53.285 56.625 1.00 16.47
PRA H
ATOM 1889 HG21 ILE A 121 17.003 54.414 54.455 1.00 22.53
PRA H
ATOM 1890 HG22 ILE A 121 16.890 53.116 55.325 1.00 22.53
PRA H
ATOM 1891 HG23 ILE A 121 17.798 53.126 54.048 1.00 22.53
PRA H
ATOM 1892 HD11 ILE A 121 18.385 52.764 57.920 1.00 26.32
PRA H
ATOM 1893 HD12 ILE A 121 19.157 51.444 57.574 1.00 26.32
PRA H
ATOM 1894 HD13 ILE A 121 17.865 51.829 56.774 1.00 26.32
PRA H

PDB OUTPUT FROM VMD
ATOM 1904 N ILE A 121 18.702 56.325 54.575 1.00 0.00
PRA N
ATOM 1905 HN ILE A 121 18.089 56.129 53.813 0.00 0.00
PRA
ATOM 1906 CA ILE A 121 19.542 55.205 54.968 1.00 0.00
PRA C
ATOM 1907 HA ILE A 121 20.184 55.525 55.636 1.00 0.00
PRA H
ATOM 1908 CB ILE A 121 18.662 54.113 55.632 1.00 0.00
PRA C
ATOM 1909 HB ILE A 121 18.264 54.544 56.417 1.00 0.00
PRA H
ATOM 1910 CG2 ILE A 121 17.478 53.649 54.787 1.00 0.00
PRA C
ATOM 1911 HG21 ILE A 121 17.003 54.414 54.455 1.00 0.00
PRA H
ATOM 1912 HG22 ILE A 121 16.890 53.116 55.325 1.00 0.00
PRA H
ATOM 1913 HG23 ILE A 121 17.798 53.126 54.048 1.00 0.00
PRA H
ATOM 1914 CG1 ILE A 121 19.508 52.942 56.194 1.00 0.00
PRA C
ATOM 1915 HG11 ILE A 121 20.182 53.422 56.755 0.00 0.00
PRA
ATOM 1916 HG12 ILE A 121 19.779 52.352 55.473 1.00 0.00
PRA H
ATOM 1917 CD ILE A 121 18.679 51.833 56.863 0.00 0.00
PRA
ATOM 1918 HD1 ILE A 121 19.348 51.057 57.293 0.00 0.00
PRA
ATOM 1919 HD2 ILE A 121 18.057 52.250 57.684 0.00 0.00
PRA
ATOM 1920 HD3 ILE A 121 18.008 51.339 56.129 0.00 0.00
PRA
ATOM 1921 C ILE A 121 20.328 54.658 53.776 1.00 0.00
PRA C
ATOM 1922 O ILE A 121 19.781 54.584 52.667 1.00 0.00
PRA O

(2) Could the lack of atom symbols in the pdb associated to the psf file,
as above, pose problems in using such files for molecular dynamics? As also
MD might be involved, I am also posting ti NAMD

thanks
francesco pietra

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