Sang Hoon Joo wrote:
I am refining my crystal structure in which I have two identical
chains in one asymmetric unit.
Space group is H32 and each chain yields me a biological trimer as expected.
The problem is, do I have to assume they are identical, or they are
really different.
After each cycle
I am refining my crystal structure in which I have two identical
chains in one asymmetric unit.
Space group is H32 and each chain yields me a biological trimer as expected.
The problem is, do I have to assume they are identical, or they are
really different.
After each cycle of refinement, if I
Dear Sang
They are really different!
And I guess you would probably want to use NCS restraints depending on
your resolution.
Regards,
Folmer
2009/3/24 Sang Hoon Joo s...@duke.edu:
I am refining my crystal structure in which I have two identical
chains in one asymmetric unit.
Space group is
Sang Hoon,
Each molecule in the asymmetric unit is most likely different. I work on a
protein that crystallizes as a homodimer with 2 molecules per asymmetric
unit and there are some differences between the two (eg: electron density
visible for the 14 N-terminal residues in one molecule, but not
Dear SHJ,
there is no reason to expect that the 3D structure of two molecules within
the same asymmetric unit are identical even if their chemical formula is
identical.
These two molecules experience slightly different crystal packing contacts
are are expected to be different. Obviously, in
Hi Sang Hoon,
You should do the refinement in BUSTER, which uses a novel method to
impose NCS restraints. These restraints (called LSSR restraints) were
designed specifically to provide an answer to your question in a
systematic way, by comparing the local environments of corresponding
Sang,
They are always different. But depending on your data/parameter ratio,
you may be better of assuming they are similar (with NCS restraints) or
even identical (with strict NCS). Ask to a friendly crystallographer
around you when employing NCS is good for you. Crystallographers with
high
Subject: Re: [ccp4bb] two identical proteins in one asymmetric unit
Sang Hoon,
Each molecule in the asymmetric unit is most likely different. I work
on a protein that crystallizes as a homodimer with 2 molecules per
asymmetric unit and there are some differences between the two (eg:
electron
o.edu/~ewa
From: CCP4 bulletin
board [mailto:CCP4BB@JISCMAIL.AC.UK]
On Behalf Of Jim
Fairman
Sent: Tuesday, March
24, 2009
11:25 AM
To:
CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb]
two identical proteins in one asymm
[mailto:ccp...@jiscmail.ac.uk] On Behalf
Of Jim Fairman
Sent: Tuesday, March 24, 2009 11:25 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] two identical proteins in one asymmetric unit
Sang Hoon,
Each molecule in the asymmetric unit is most likely different. I
work on a protein
proteins in one asymmetric unit
Sang Hoon,
Each molecule in the asymmetric unit is most likely different. I
work on a protein that crystallizes as a homodimer with 2 molecules
per asymmetric unit and there are some differences between the two
(eg: electron density visible
Fairman
Sent: Tuesday, March 24, 2009 11:25 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] two identical proteins in
one asymmetric unit
Sang Hoon,
Each molecule in the asymmetric unit is most
likely different. I work
From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of Jim
Fairman
Sent: Tuesday, March 24, 2009 11:25 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] two identical proteins in one asymmetric unit
Sang Hoon,
Each
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