Re: [AMBER] How to calculate the tilt angle of TM helix

From: Dickson, Callum <>
Date: Fri, 9 Aug 2019 20:49:44 +0000

Hi Maria,

You can use cpptraj and the vector command with type "principal" to get the principal axes of inertia of your helix.


-----Original Message-----
From: Maria Bzwka <>
Sent: Friday, August 9, 2019 4:18 AM
To: AMBER Mailing List <>
Subject: [AMBER] How to calculate the tilt angle of TM helix

Dear All,

During the simulation I can see quite a lot of changes in the position of my TM helix immersed in the lipid bilayer, so I would like to calculate the tilt angle between the transmembrane helix principal axis and the vector along the Z-axis. However, I'm not so sure how to do that...
As a principal axis of TM helix I mean the C-alpha atoms from the helix (which is 30 residues) and I suppose that I should somehow use the vector command from cpptraj?

Do you have any suggestions?

Thank you in advance

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Received on Fri Aug 09 2019 - 14:00:01 PDT
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