Re: [ccp4bb] coiled coil question

2009-10-05 Thread Xie Jiabao
Dear all, I thank everyone who directed me to coiled coil structures where the alpha helical chains are related by a crystallographic axis. My question was prompted by an examination of structures (mainly parallel homodimers) where this is not the case. In most structures, including 2zta (the

[ccp4bb] coiled coil question

2009-10-04 Thread Xie Jiabao
Dear all, I thank everyone who directed me to coiled coil structures where the alpha helical chains are related by a crystallographic axis. My question was prompted by an examination of structures (mainly parallel homodimers) where this is not the case. In most structures, including 2zta (the c

[ccp4bb] coiled coil question

2009-10-03 Thread Xie Jiabao
Dear all,  Is anyone aware of a structure where the individual alpha helical chains of a coiled coil are related by a crystallographic axis? Or does anyone know of a coiled coil structure (dimer or higher order oligomer) that is perfectly symmetric at least in terms of the protein backbone or al

[ccp4bb] PHIDM AND FOMDM from DM

2009-02-05 Thread Xie Jiabao
Dear all, I am using the density modification tool in ccp4 to generate improved phases for/from my model. I find that the electron density map I generate using Fobs, and density modified phases (PHIDM) are not the same as that generated using Fobs, phicalc (original calculated phases) and FOMDM

Re: [ccp4bb] brute force molecular replacement

2009-02-01 Thread Xie Jiabao
#x27;t be solved faster with Phaser using the fast search methods. (If anyone has such a case, we'd be delighted to learn what it has to teach us!) Is there a particular reason you'd like to try a brute-force search? Regards, Randy Read On Jan 24 2009, Xie Jiabao wrote: > Dear a

[ccp4bb] brute force molecular replacement

2009-01-24 Thread Xie Jiabao
Dear all, >From where can I download the molecular replacement program BRUTE? What are >the other brute force programs for molecular replacement out there? Thanks in advance, Xie

[ccp4bb] Create a dual boot windows-linux machine

2009-01-17 Thread Xie Jiabao
Dear all, My sincere apologies at the outset for a non-ccp4 question. I am trying to install ubuntu-8.04.1 (64-bit) linux on my windows xp containing core2 laptop so as to create a dual boot system. At the moment windows xp is installed on a 30GB partition and there is another 20 GB FAT32 parti

Re: [ccp4bb] problem running DISTANG

2008-08-11 Thread Xie Jiabao
onday, August 11, 2008 4:25:02 AM Subject: Re: [ccp4bb] problem running DISTANG It is not accepting your input pdb; can you give more details? eg the command script.. eleanor Xie Jiabao wrote: > Hello, > > > I am trying to run the CCP4 program DISTANG from the command line (in or

[ccp4bb] problem running DISTANG

2008-08-06 Thread Xie Jiabao
Hello, I am trying to run the CCP4 program DISTANG from the command line (in order to do a translational grid search of a molecule over the asymmetric unit). But the program aborts with the following error message when I type DISTANG at the command line.

[ccp4bb]

2008-05-28 Thread Xie Jiabao
Hi, Can anyone direct me to a program that calculates a protein cavity's dimensions (average) and not just its volume? Thanks in advance, Xie