Normal mode analysis

Task?

Parameters

• If possible, use a cutoff for C_α atom pairs of 15 Å.
• Calculate the 10 lowest-frequency normal modes (the six zero modes have to be considered for a few applications).
• In most cases you can upload the original .pdb file from the Protein Data Bank. In some cases, however, you can upload only the structure itself (ATOM lines of the .pdb file).

WEBnm@

Webserver:

• http://apps.cbu.uib.no/webnma/home

Params:

• try the amplitude scaling and vectors option

ElNemo

Webserver:

• http://www.igs.cnrs-mrs.fr/elnemo/start.html

Anisotropic Network Model web server

Webserver:

• http://ignmtest.ccbb.pitt.edu/cgi-bin/anm/anm1.cgi

Params:

• set the distance weight to 3.0
• try the amplitude scaling and vectors option
• have a look at the different ANM model cutoffs

oGNM – Gaussian network model

Webserver:

• http://ignm.ccbb.pitt.edu/GNM_Online_Calculation-t.htm

Params:

• set the cutoff to 15 Å

NOMAD-Ref

Webserver:

• http://lorentz.dynstr.pasteur.fr/nma/submission.php

Params:

• set the distance weight to 3.0
• set the cutoff to 15 Å

All-atom NMA using Gromacs on the NOMAD-Ref server

Webserver:

• http://lorentz.dynstr.pasteur.fr/gromacs/nma_submission.php

Params:

• All-atom calculations are only supported for small proteins of up to 2,000 atoms. Use for example BPTI, PDB entry: 1BPT. Upload a .pdb file that contains only the ATOM lines of the original .pdb file. You can also choose another small protein for the all-atom NMA.
• set the temperature to 600K and 2000K
• you can visualize the modes with PyMol or VMD.
• Compare the all-atom NMA of BPTI (or your chosen protein) with an elastic network calculation, e.g. NOMAD-Ref.

Used:

• 1a6z?