Subject: Re: CCL:About missing residues

From: Atchara Wijitkosoom <[email-masked]>
Date: Thu, 23 Jan 2003 10:33:38 -0700

Hi,

Here is the response from many people about adding the missing residues. Hope
it may be helpful for other people.

Atchara

>
>
>> At 05:18 PM 1/22/03 -0700, you wrote:
>> >To whom it may concern,
>> >
>> >Does anybody know the program that be able to add some missing residues
>> >in protein? Thanks in advance.
>
>
> Anyway, I'd like you to post (at least to me) a summary of your
> responses.
> Thanks.
>
> Nicolas
>

1. The Biopolymers module of SYBYL (Tripos Inc., St. Louis, MO) should handle
the task.

2. In principle, Molden should be able to do it but my own experience is
that it does not work in all cases.

3. The crdgrow programm which is part of AMBER7 can do this
(its automated and easy) if parts of a residue are missing
(mostly used for hydrogens, but works for heavy atoms as
well)

If whole parts of a chain are missing, you can try to use
MODELLER, a friend of mine used it to build missing loops.

4. Jackal.
http://trantor.bioc.columbia.edu/~xiang/jackal/#profix

5. SwissPdbViewer can do this, when you load a molecule.
http://www.expasy.org/spdbv/

6. Even Leap can do that. But you have to specify at least 3 atoms from
each residue that you want to add in the pdb file (with coordinates).
Alternatively you can do it with any other modeling software by building
a small peptide that contains the new residues plus 1-2 residues from
the protein (the ones adjacent to the new ones). Then you can run some
minimization with positional restraints on the common residues and then
do an rms fit with them and write a pdb file with both molecule and
remove the atoms that appear twice.