Tim wrote: > answered this offlist. turns out the easiest way was by atomno range. > > a propeptide is a part of the protein that is cleaved during > post-translational modification to give the active form of the enzyme > (where it might be problematic to have the enzyme active before it is in > the proper cellular location). OK, thanks. > the residue numbers for this propeptide (file 3PBH) are 1P-62P; the rest > of the protein starts at residue 1. note that the propiece residue > numbers include the 'P'; this is not a chain designation. These are insertion codes. > but > unfortunately, we could not even select these residues using 1P, 2P, RasMol/Chime will interpret these as a chain identifier of 'P' > etc., nor using resno=1P, etc. :-( RasMol/Chime does not handle them. For those who may be wanting to work with this kind of thing in Jmol ... Jmol handles insertion codes using a ^ caret syntax. The caret is required to avoid ambiguity with a chain designation. So, in this case the syntax to select the propeptide would be select 1^P-62^P And saying select 62 Would select only residue 62, not residue 62^P Miguel