From High to Low

This site contains information on how you can compute low-resolution density from an atomic model. This method is described in D.M. Belnap, A. Kumar, J.T. Folk, T.J. Smith, and T.S. Baker (1999) Low-Resolution Density Maps from Atomic Models: How Stepping 'Back' Can Be a Step 'Forward' J. Struct. Biol., 125:166-175. There are four basic steps to the method (detailed instructions are given under each heading):

1) Retrieve an atomic model

2) Edit the model, for XPLOR or CCP4

3) Compute structure factors with XPLOR or CCP4

4) Compute 3D density with XPLOR or CCP4

Download EMSF3DBT program

Get DealPDB, a program to manipulate PDB files.

Click here for XPLOR and CCP4 resources.

For questions regarding the XPLOR procedure, please contact David Belnap

For questions regarding the CCP4 procedure, please contact Jon Folk