# Zinc finger protein

**URL:** <https://ask.bioexcel.eu/t/zinc-finger-protein/76>\
**Category:** HADDOCK\
**Created:** [May 2, 2016, 8:22am UTC](https://ask.bioexcel.eu/t/zinc-finger-protein/76 "2016-05-02T08:22:56Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\
**Post date:** [May 2, 2016, 12:20pm UTC](https://ask.bioexcel.eu/t/zinc-finger-protein/76/3 "2016-05-02T12:20:16Z")

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Which kind of restraints did you define to maintain the geometry of the zinc finger?

To get proper results make sure to define distance restraints between:

- all atoms coordinating the zinc (basically define the tetrahedron connecting them
- each coordinating atom and the zinc atom.

Note that the distance restraints must have the zinc atom name between double quotes because of the + in the name.  
The correct nomenclature for HADDOCK for the zinc is:

- residue name: ZN2
- atom name: ZN+2 (shifted one character to the left in the PDB file

Also you might use CYF for the cysteines coordinating your zinc (those will not carry the hydrogen on the sulfur)

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