[ccp4bb] electrostatic potential and charged residues

2012-09-14 Thread Qiang Chen
Hi all, I'm working on a protein structure which showed a special electrostatic potential on its surface: positive on one end and negative on the other end. I wonder to what extent I can say this pattern is determined by the charged residues? If the residues are conserved, could I make a

[ccp4bb] correlations of B-factors and resolution

2012-05-16 Thread Qiang Chen
Dear all, I have a 2.4A structure(pdb code 3LAF)with an average protein b-factor of 48. I wonder whether it's acceptable. Is there a direct correlation of b-factor and resolution? The R and Rfree are 21.1% and 23.1%, respectively. This structure has a very high solvent content, 75%. Does it

Re: [ccp4bb] correlations of B-factors and resolution

2012-05-16 Thread Qiang Chen
according to Axel Brunger's article about that topic. Cheers, Tim On 05/16/12 15:46, Qiang Chen wrote: Dear all, I have a 2.4A structure(pdb code 3LAF)with an average protein b-factor of 48. I wonder whether it's acceptable. Is there a direct correlation of b-factor and resolution? The R

[ccp4bb] Positions in Structural Biology of Signaling and HIV-related Immunology

2012-04-06 Thread Qiang Chen
There are two immediate openings for protein crystallographer position in Harvard Medical School. One of the research projects is focused on the structural and functional investigation of Wnt signaling pathway. The project is the close collaborative efforts between Professor Xi He’s lab at

[ccp4bb] Position in Structural Biology of Signaling

2012-04-05 Thread Qiang Chen
There is an immediate opening for a protein crystallographer position in Harvard Medical School’s Children’s Hospital. The research is focused on the structural and functional investigation of Wnt signaling pathway. The project is the close collaborative efforts between Professors Xi He and

Re: [ccp4bb] real dimer vs crystal packing

2012-02-20 Thread Qiang Chen
structures, I think. Artem On Thu, Jan 12, 2012 at 10:03 AM, Qiang Chen c...@red.dfci.harvard.eduwrote: Hi, I'm working on a multi-domain protein which uses three domains to form homodimer, and the full-length structure is available. We have solved the structure of one binding domain

[ccp4bb] real dimer vs crystal packing

2012-01-12 Thread Qiang Chen
Hi, I'm working on a multi-domain protein which uses three domains to form homodimer, and the full-length structure is available. We have solved the structure of one binding domain alone and found its homo-binding mode is totally different from that of the full-length protein. Do you know

[ccp4bb] multi domain restriction for protein binding

2011-12-16 Thread Qiang Chen
Hi guys, I'm working on a multi-domain protein which uses three domains to form homodimer, and the full-length structure is available. We have solved the structure of one binding domain alone and found its homo-binding mode is totally different from that within the context of the full-length

[ccp4bb] Postdoctoral fellow position in structural biology

2011-09-09 Thread Qiang Chen
Peking University, College of Life Sciences seeks to recruit dedicated postdoctoral fellows to carry out structural and functional investigation of cell surface receptors in nervous systems. The successful candidates will focus his/her research on elucidation of molecular mechanism with which

[ccp4bb] O-linked glycosylation refinement in Phenix

2011-04-10 Thread Qiang Chen
Dear all, I'm refining a structure which has both N-linked and O-linked glycosylation. I use Phenix to do the refinement. It works well for the N-linked NAG. I defined the link as the following: apply_cif_link { data_link = NAG-ASN residue_selection_1 = chain A and resname NAG

[ccp4bb] Postdoctoral fellow position in structural biology

2011-03-29 Thread Qiang Chen
Dear all, on behalf of Jia-huai Wang, I post this message. For inquiries please contact Jia-huai at jw...@dfci.harvard.edu. Postdoctoral fellow position in structural biology Peking University, College of Life Sciences seeks to recruit dedicated postdoctoral fellows to carry out structural

[ccp4bb] twinned?

2008-04-02 Thread Qiang Chen
Hi all, The data I am working on has a strong translation vector. The space group is C2221 and resolution is 2.3 angstrom. There are two molecules per AU with a pseudo-2-fold axis. On the cumulative intensity distribution plot, the theor and obser curves totally do not overlap. I did