timothy driscoll wrote:

> at 12:12 pm EDT on (Thursday) 20 November 2003 jr said:
> > >
> > >
> > > > The Insertion code is really important and I'm very sad about the
> > > > lack of a primitive for it, but RasMol in contrary to Jmol is able
> > > > to deal with it (there must be an internal primitive). Try 1hag
> > > > http://www.imb-jena.de/cgi-bin/SCOPlnk3.pl?ASK=1hag
> > > > Jmol wouldn't load the molecule, and if, how do I select between
> > > > ATOM     20  CA  GLY E   1F     20.593  14.133  18.600  1.00 50.00
> > > > 1HAG 213
> > > > ATOM     30  CA  GLY E   1D     18.774  17.420  21.596  1.00 50.00
> > > > 1HAG 223
> >
> > the insertion code is the char (here F and D) in column 27 of the ATOM
> > or HETATM record
> >
> > >
> > >
> > > How was it marked again to be two complementary, alternative
> locations?
> >
> > This aren't alternative locations, this is for compatibility in residue
> > number e.g. the homologous molecule in different species or think of a
> > splice variant ...
> >
> so the insertion code identifies atoms from a homologous structure?  I
> grow more confused.  if this is true, don't they belong in a separate
> structure file altogether?

no, it should make it easier for humans to compare different but related structures, 
e.g. for the  Trypsin-like serin protease prethrombin2 in 1hag the numbering is done 
like in chymotrypsin
it may become clearer if you read the REMARKs
REMARK   4 CHYMOTRYPSIN NUMBERING (RATHER THAN SEQUENTIAL) SYSTEM IS    1HAG  74
REMARK   4 USED, BASED ON THE TOPOLOGICAL ALIGNMENT WITH THE            1HAG  75
REMARK   4 STRUCTURE OF CHYMOTRYPSIN (W.BODE ET AL., 1989, EMBO J. 8,   1HAG  76
REMARK   4 3467-3475).                                                  1HAG  77

Regards, Jan



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