generating psf for RNA using psfgen

From: MinSoo Kim (
Date: Fri Jan 30 2004 - 01:53:40 CST

i've attempted to generate psf file for an RNA using charmm topology
files for nucleotides. The BPTI example worked fine. But when i create
a segment from the rna pdb file it gives me an output:
% segment RNA {
pdb /Users/visitor2/NAMD/backup/RNA.pdb
building segment RNA
reading residues from pdb file /Users/visitor2/NAMD/backup/RNA.pdb
extracted 0 residues from pdb file
Info: generating structure...
Info: segment complete.

why is it that it fails to extract any residue?
i would be very thankful if anyone could provide any help


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