Dear Xiuwen,
First, I cant see how the space group is C2221 with a beta of 92.3
Maybe you need to clear the symmetry confusion before getting
additional pseudo-symmetry suggestions.
A.
On Nov 29, 2010, at 14:16, xiuwen zhang wrote:
Dear colleages,
Currently I met problem in a MR case and hope somebody could
advise me.
The crystals belong to sg C2221 with the cell parameters a=59A,
b=302A, c=97A, beta=92.3. The searching model shares 43% identities
(300aa) with target protein. When searching in PHASER program, only
one clear solution could be found with high Z-score: RZF=9.8 and
TZF=24.2. However, though the density is interpretative, the
solution coordinate could not fit in the density (Rfactor high to
54%). Moreover, as suggested by matthews_coff, there should be at
least 2 molecules in one ASU. But I could not find the other
molecules in the ASU in this case (though the other solution are
defined with high Z-score RZF=7.8 and TZF=59, this solution has 115
clashes with the first one). I also find that this solution
coordinate occupied some "layers" and most of the unit cell are lack
of density. As Phenix.xtrage suggested the data is not twinned, I
was totally confused by this situation.
I will appreciate if you could share your opinions and
experience on similar case with me.
Best Regards,
Xiuwen
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Anastassis (Tassos) Perrakis, Principal Investigator / Staff Member
Department of Biochemistry (B8)
Netherlands Cancer Institute,
Dept. B8, 1066 CX Amsterdam, The Netherlands
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