Hi Dave,

You can set the chain identifier for each object

alter object, chain="A"

And then you can create a new object

create alltogether, chain A+B+C+D

That object you can then use for fitting.

Hope it helps,

Tsjerk

On Wed, Oct 3, 2012 at 7:22 PM, Bourgaize David <dbourga...@whittier.edu> wrote:
> Hello, all.
>
> First let me announce that I am not a PyMOL poweruser, and I have virtually
> no experience with crystallography and its data files. I have been plugging
> along using the PyMOLwiki as my knowledge-base for years, but cannot seem to
> wrap my head around certain issues.
>
> For example, 6pfk (phosphofructokinase) exists as a file that, when fetched,
> opens as a complete biological unit (a tetramer), with chains A, B, C, and
> D. However, 4pfk is only one subunit. When I then fetch 4pfk, type=pdb1 in
> order to obtain the biological unit, I can split_states and delete the
> original 4pfk. This leaves me with  a biological unit, but one in which each
> chain is its own object.
>
> Ultimately, I would like to be able to align/superimpose various parts of
> these two structures. Is there an easy way to do this, given that one is a
> single object with multiple chains, and the other is four separate objects?
> Or. Alternatively, is there a way to convert the 4pfk biological unit into a
> single object, with chains A, B, C, and D?
>
> Thanks-
>
> Dave Bourgaize
> Whittier College
>
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-- 
Tsjerk A. Wassenaar, Ph.D.

post-doctoral researcher
Biocomputing Group
Department of Biological Sciences
2500 University Drive NW
Calgary, AB T2N 1N4
Canada

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