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Metal ion electron density

Miriam Hasson mhasson at BRAGG.BIO.PURDUE.EDU
Tue Jun 4 15:14:31 EST 1996

In answer to:
>We have a protein that coordinates Ca2+.  The electron density is oblong
>instead of spherical.  This is true in both the Fo-Fc without Ca2+ in the model
>and in the 2Fo-Fc with Ca2+.
>Does any one else see this non-spherical density phenomenom in a Ca2+ (or other
>metal ion) coordinating a macromolecule?

Your data may represent an average of two states of the protein, with the
metal in a slightly different position in each.  This was the case for one
xylose isomerase structure.


Miriam Hasson
Assistant Professor
Purdue University
Department of Biological Sciences
Lilly Hall of Life Sciences
West Lafayette, IN  47907-1392

Telephone:  (317)496-2928, 496-1984
Fax:        (317)496-1189
E-mail:     mhasson at bragg.bio.purdue.edu


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