# Water coordinates for TIP4P-D water model

**URL:** <https://gromacs.bioexcel.eu/t/water-coordinates-for-tip4p-d-water-model/935>\
**Category:** User discussions\
**Created:** [October 8, 2020, 7:08am UTC](https://gromacs.bioexcel.eu/t/water-coordinates-for-tip4p-d-water-model/935 "2020-10-08T07:08:30Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![venkatareddy](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@venkatareddy](https://gromacs.bioexcel.eu/u/venkatareddy)\
**Post date:** [October 8, 2020, 7:08am UTC](https://gromacs.bioexcel.eu/t/water-coordinates-for-tip4p-d-water-model/935/1 "2020-10-08T07:08:30Z")

</div>

GROMACS version: 2020.3  
GROMACS modification: Yes/No  
Hi,  
I am simulating protein-protein complex with a small molecule ligand (Acetyl CoA).  
I am using DES-Amber-SF1.0.ff. The water model suggested for  
this force field is TIP4P-D.  
Where do I get coordinate fiel (.gro) file for this water model  
to use while solvating the system.  
And also some tips on simulating protein-protein complexes.

Thank you,  
Venkat

---

<div class="post-metadata">

**Author:** ![alevilla](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/alevilla/32/439_2.png) [@alevilla](https://gromacs.bioexcel.eu/u/alevilla)\
**Post date:** [October 8, 2020, 8:02am UTC](https://gromacs.bioexcel.eu/t/water-coordinates-for-tip4p-d-water-model/935/2 "2020-10-08T08:02:06Z")

</div>

Hi,

I guess that TIP4P-D is a four-site model. You can use tip4p.gro as coordinate file for gmx solvate.

Best regards  
Alessandra