Is there any tool by which i can find the residues involved in helix-helix interaction in case of proteins mainly in membrane proteins.
You could use iCn3D (https://structure.ncbi.nlm.nih.gov/icn3d) by selecting two sets (https://www.ncbi.nlm.nih.gov/Structure/icn3d/icn3d.html#selsubset) and retrieving the interactions between two sets with the menu "Analysis > Interactions". Here is one example: https://structure.ncbi.nlm.nih.gov/icn3d/share.html?zNuNNLjR6bB3eVS78
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