Hi Martin -

** Short answer:

Use `resn asp+glu` (although your original command actually works for me).

** Not-so-short answer, with a bonus question about comment syntax:

The Asp/Glu line of your script can be condensed slightly using a plus sign, 
but the original syntax of that line actually works fine for me (PyMOL v.1.3, 
Fink/X11 build on Mac OS 10.6.6).  However, for me, the lines to remove waters 
and add hydrogens fail.

To elaborate, I've found that, with certain commands (but oddly not all of them 
-- for example, the `color` statements in your original script handle this just 
fine), adding a comment on the same line returns a "Malformed selection" error. 
 I don't know if this is by design or an "unintended feature."  I would expect 
these comments to be handled the same way as in Python code, but for whatever 
reason, they are not.

(Query for the developers: Is there a specific reason some PyMOL functions 
attempt to include the hash mark and comment in the selection, rather than 
ignoring everything after the #?  Perhaps it has something to do with the 
number of arguments--both the commands below that fail with an inline comment 
take only a single selection argument.)

If you really want to keep the comment on the same line, add a semicolon 
between the command and the comment.  The other option, of course, is to place 
the comment on the previous line.

Also, you can use `remove solvent` to cover all the different ways of 
describing water (HOH, WAT, H2O).

Try this:

# remove water
remove solvent;                              # or put the comment on the same 
line after a semicolon

# add hydrogens
h_add;                                       # this one also requires a 
semicolon

# basic view
as surface
color grey90

# color lys blue, cys yellow, asp/glu red
color slate, resn lys                        # comments here seem to work 
without the semicolon
color paleyellow, resn cys
color tv_red, resn asp+glu

Hope that helps,
--
Jared Sampson
Xiangpeng Kong Lab
NYU Langone Medical Center
New York, NY 10016
212-263-7898

On Mar 1, 2011, at 7:44 AM, Martin Hediger wrote:

Dear all
What is the selection syntax to select all GLU and ASP residues within an 
object?

I'm trying it the way its written on the wiki:

remove resn hoh    # remove water
h_add              # add hydrogens

as surface
color grey90

color slate, resn lys       # lysines in light blue
color paleyellow, resn cys  # cysteines in light yellow
color tv_red, (resn asp or(resn glu))  # aspartic and glutamic acid in light red



but, the selection kind of does not work for me (I'm assuming the operator for 
the logical AND is 'and').
What is it that I need to do differently?

Kind regards
Martin
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