Showing posts with label ion channel. Show all posts
Showing posts with label ion channel. Show all posts

Thursday, December 17, 2009

Steered MD in GROMACS (pull code)

The pull code allows to apply a force between two centers of mass (for >1 groups). It appears to be useful to simulate protein penetration into lipid membrane (channel formation). Config must have a following lines:
pull_start = yes
pull_init1 = 0
pull = umbrella
pull_geometry = direction
pull_group0 = Protein
pull_group1 = POPC
pull_vec1 = 0 0 0.5
pull_k1 = 3000
pull_rate1 = 0.01 ; nm/ps Extreme parameters for extreme pulling

discussions: [1], [2]

Friday, October 2, 2009

b-Amyloid Ion Channels

Models of b-Amyloid Ion Channels in the Membrane Suggest That Channel Formation in the Bilayer Is a Dynamic Process: amyloid ion channel formation mechanism suggested (src)