# Haddock with metalloproteins

**URL:** <https://ask.bioexcel.eu/t/haddock-with-metalloproteins/3093>\
**Category:** HADDOCK\
**Created:** [June 10, 2021, 12:34am UTC](https://ask.bioexcel.eu/t/haddock-with-metalloproteins/3093 "2021-06-10T00:34:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![crbrue](https://avatars.discourse-cdn.com/v4/letter/c/ee59a6/32.png) [@crbrue](https://ask.bioexcel.eu/u/crbrue)\
**Post date:** [June 10, 2021, 12:34am UTC](https://ask.bioexcel.eu/t/haddock-with-metalloproteins/3093/1 "2021-06-10T00:34:44Z")

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Hi Professor Bonvin,

Thank you so much for the great talk and tutorial on monday. I want to do some protein-DNA docking with a zinc finger protein transcription factor I work with, is there a way to add bond parameters from another force field (i use amber’s zinc amber forcefield, ZAFF) parameters for coordination bonds to the structural zinc ion? or is there already a method for HADDOCK for zinc proteins?

Thanks!  
Chris