[phenixbb] Simple Phaser Question

Joseph Noel noel at salk.edu
Fri Dec 24 17:11:37 PST 2010

Hi All,

I am working with a protein that is a physiological dimer. On occasion I obtain a unit cell with one monomer in the asymmetric unit but most often I obtain an enantiomorphic space group with an expanded C axis that contains two molecules in the asymmetric unit. Anyway, that is all moot to some extent. I am wondering if for the case of my NCS dimer, is there a way using Phaser in Phenix to ensure that when both monomers are found, they are "close together" representative of the physiological dimer? When I search with individual monomers I often obtain a solution with two monomers but in different asymmetric units. Of course, I could easily do the transformation to form the physiological NCS dimer for later refinement but just wondering if I could avoid this from the get go with the appropriate Phaser keyword input (GUI if possible).

Thanks and Happy Holidays!

Joseph P. Noel, Ph.D.
Investigator, Howard Hughes Medical Institute
Professor, The Jack H. Skirball Center for Chemical Biology and Proteomics
The Salk Institute for Biological Studies
10010 North Torrey Pines Road
La Jolla, CA  92037 USA

Phone: (858) 453-4100 extension 1442
Cell: (858) 349-4700
Fax: (858) 597-0855
E-mail: noel at salk.edu

Web Site (Salk): http://www.salk.edu/faculty/faculty_details.php?id=37
Web Site (HHMI): http://hhmi.org/research/investigators/noel.html

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