Many of the predefined sets were broken in recent releases ... they are
now fixed. The exceptions are:

cystine: this set represents cys residues that are part of disulfide
bridges. I have done nothing on ssbonds, so this set does not work.

I have several questions about 'nucleic' things. The RasMol doc is very
confusing and there is no need to repeat what it says. Here are some
questions:

Is there a predefined set 'u' ?

Does the predefined set 'at' also include 'u' ?

Is there a predefined set 'au' ?

Does the predefined set 'nucleic' also include 'u' ?


Next set of questions ...

When I look at the PDB format specification I see:


RESIDUE                                  ABBREVIATION
-----------------------------------------------------------------------
Adenosine                                  A
Modified adenosine                        +A
Cytidine                                   C
Modified cytidine                         +C
Guanosine                                  G
Modified guanosine                        +G
Inosine                                    I
Modified inosine                          +I
Thymidine                                  T
Modified thymidine                        +T
Uridine                                    U
Modified uridine                          +U


First, with respect to Inosine:

Should there be a predefined set 'i' ?

Should it be included in the 'nucleic' set?

Second, with respect to the 'Modified' versions:

Should +A be included in the sets 'a', 'at', and 'purine' ?

I don't think there is any way to select these 'modified' residues.

Should there be a predefined set so that one can select them?

Can you select these things in the RasMol/Chime atom expression syntax?

I have not tried it, but I am quite sure the Jmol expression parser will
not accept a '+' in this context. Do I need to fix the expression parser
to allow non-alpha-numeric characters as a residue name?


Miguel





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