[ccp4bb] B-factor & Space gr questions!

Protein crystallography Programs for crystallography X-ray detectors
Basic tutorials:
Protein Peptide

CCP4bb navigation

CCP4bb <-- 2007 <-- June 2007 <-- 04 June 2007

Previous message:
Subject: Re: Conservation of momentum - was "Is anomalous signal a different wavelength?"
From: "Nave, C (Colin)" c {- dot -} nave {- at -} DL {- dot -} AC {- dot -} UK
Date: 2007-06-04

Next message:
Subject: error using NCS in dm
From: Jay Thompson jay {- dot -} xtalman {- at -} GMAIL {- dot -} COM
Date: 2007-06-04

Subject: B-factor & Space gr questions!
From: "Ibrahim M {- dot -} Moustafa" I {- dot -} moustafa {- at -} PSU {- dot -} EDU
Date: 2007-06-04

Hi all,

While reading a crystallographic paper describing the structure
of an apo-protein and its complex I noticed that

the authors described the space goup as P6122 for the unit cell:
a=141.9, b=143.9, c=380.4 !

Could this be considered as a typo or I'm missing something here!
the requirement for the hexagonal is a = b # C....right?

Another observation in that paper too: the B-factors for the 2.4 A
and 3.2 A structures are 39 and 40?? Does this make sense to anyone??

The last question: In the same paper, for the complex structure R and
Rfree are equal (30%) is that an indication for improper refinement
in these published structure? I'd love to hear your comments on that too.

thanks,
Ibrahim

----------------------------------------------------------------------------------------------------------
Ibrahim M. Moustafa, Ph.D.
Biochemistry and Molecular Biology Dept.
201 Althouse Lab., Uinversity Park
Pennsylvania State University, PA16802

Tel. (814)863-8703
Fax. (814)865-7927
----------------------------------------------------------------------------------------------------------

CCP4bb navigation

CCP4bb <-- 2007 <-- June 2007 <-- 04 June 2007

Next message:
Subject: error using NCS in dm
From: Jay Thompson jay {- dot -} xtalman {- at -} GMAIL {- dot -} COM
Date: 2007-06-04