Applying unidirectional pressure on a membrane protein system

From: Sruthi Sundaresan (
Date: Sat May 28 2022 - 01:38:36 CDT

Dear Users,
I would like to know how to apply pressure on a membrane protein in one
direction. I am running the simulations on NAMD3.0 and used the following
lines in the input files to apply pressure:

*useConstantArea yes;*
*useflexiblecell yes;*

*SurfaceTensionTarget 0.0;*

*langevinPiston on;*

*langevinPistonTarget 4000.00;*

*langevinPistonPeriod 100.0;*

*langevinPistonDecay 50.0;*

The above lines help to apply pressure on the z-axis alone while keeping
the area of the x-y plane constant.
My system seems to get compressed along the z-axis, however, I'd like to
know how to apply pressure selectively in one direction alone (either +z or

Thanks and regards,


Sruthi Sundaresan

Ph.D. Research Scholar

C/o Dr. Thenmalarchelvi Rathinavelan

Molecular Biophysics Lab, Department of Biotechnology




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