Dear Gihan,

The most likely thing I can think of is that the sequence contains a character 
not recognised as a legitimate one-letter code.  This could happen if you use a 
special letter coding for an ambiguous residue, or if you say it’s a nucleic 
acid sequence instead of a protein sequence.

Something else we have seen occasionally is that people save a sequence file 
from a program that writes rich text format or something other than pure text.  
You could try looking at the file with a pure text editor, or using the “file” 
command from the terminal on a Unix (Linux, Mac) system.

If neither of these explain the problem, please send the offending sequence 
file to me (off-list) and I’ll see if I can find out what’s wrong.

Best wishes,

Randy Read
-----
Randy J. Read
Department of Haematology, University of Cambridge
Cambridge Institute for Medical Research     Tel: +44 1223 336500
The Keith Peters Building                               Fax: +44 1223 336827
Hills Road                                                       E-mail: 
rj...@cam.ac.uk
Cambridge CB2 0XY, U.K.                              
www-structmed.cimr.cam.ac.uk

> On 22 Mar 2020, at 03:26, Gihan Ketawala <gketa...@asu.edu> wrote:
> 
> Hi. 
> 
> I get this "INPUT ERROR: Erro interpreting Composition sequence" message when 
> I try to MR in ccp4 Pherser MR. I've been using regular *.fasta file for the 
> sequence. First, I thought the error coming from the changes I made to the 
> *.fasta fill, but even when I'm using the original file straight from the PDB 
> I still get the error. Any help you guys can give to point me in the right 
> direction is highly appreciated.
> 
> Gihan
> 
> i.e. I'm getting the same error with Phenix-Phaser MR as well
> 
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