Use of NCS in Protein Structure Refinement

[Gerard 'CD' Kleywegt]

For those interested in the use of non-crystallographic
symmetry in protein structure refinement, I have put a
preprint of a paper on the WorldWideWeb.

Point your browser to:

  http://onyx.bmc.uu.se/~gerard/ncs/ncs.html

Or got to http://onyx.bmc.uu.se/ and follow the links.

The paper deals with three aspects of NCS and refinement:
 o  methods to assess differences between NCS-related
    molecules (other than RMSDs)
 o  application of these to a set of several hundred
    structures in the PDB
 o  implications for X-ray refinement in the presence
    of non-crystallographic symmetry

The "Quality DataBase" mentioned in the paper (containing
quality and validation statistics for 476 structures from
the PDB), as well as the SGI version of a program to query
this database, are available to anyone interested via
anonymous ftp from rigel.bmc.uu.se, directory pub/qdb.

--Gerard Kleywegt
  BMC, Uppsala