Hi,

A general note: make_ndx and index files are not magical in any way. You can 
usually construct an index group from e.g. a pdb file with awk. It's just lists 
of atom indices.

Best,

Erik

28 nov 2012 kl. 22.33 skrev Justin Lemkul:

> 
> 
> On 11/28/12 3:43 PM, Hovakim Grabski wrote:
>> Dear Gromacs users,
>> I set a  simulation of 26 base pairs  of  DNA with Ethidium Bromide for 5 ns.
>> After a while Thymine rotated for about 70 degrees and then returned to its 
>> initial position.
>> I wanted to find out hbonds between Adenine and Thymine but with make_ndx 
>> things don't work so well.
>> How can I select Adenine from one strand and Thymine from the other strand 
>> and then run g_hbond ?
> 
> You can use make_ndx to select any residues you want.  You'll have to 
> describe exactly what you did that produced insufficient results.  Saying it 
> didn't work well doesn't tell us anything, because it is in fact quite easy 
> to produce usable index groups.
> 
> -Justin
> 
> -- 
> ========================================
> 
> Justin A. Lemkul, Ph.D.
> Research Scientist
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu | (540) 231-9080
> http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> 
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-----------------------------------------------
Erik Marklund, PhD
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,    75124 Uppsala, Sweden
phone:    +46 18 471 6688        fax: +46 18 511 755
er...@xray.bmc.uu.se
http://www2.icm.uu.se/molbio/elflab/index.html

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