Re: [ccp4bb] criteria to set resolution limit

2021-09-11 Thread Rajiv gandhi.s
Dear Chang, One need to set resolution cut off, to have a meaningful data without losing high resolution data and keeping data integrity. Some key quality indicators like I/Sigma I, CC 1/2 and Rpim etc., at outer most shell need to be considered. What was the CC 1/2 value in outer shell ?

Re: [ccp4bb] Structural Alignment

2020-04-08 Thread Rajiv gandhi.s
UCSF chimera or chimeraX versions both could do the alignment of multiple structures that also pop up the sequence alignment with secondary structures highlighted in different colors through Match Maker. Up-to six structures I have aligned. Best regards Rajivgandhi Sundaram. On Wed, Apr 8,

Re: [ccp4bb] AW: [EXTERNAL] Re: [ccp4bb] on-topic: your opinions requested!

2020-04-07 Thread Rajiv gandhi.s
Any paper published should share the data publicly, it is the job of the journal editor to ask so. If they don't want to disclose to scientific community then, how one could trust the data published in that paper describes active site and key structural information. Contact the editor of the

Re: [ccp4bb] Crystal screen for DNA binding proteins

2019-10-15 Thread Rajiv gandhi.s
This following screen Is generally used for DNA but one can give a try for dna-protein complex as well. https://hamptonresearch.com/product-Individual-Natrix-Natrix-2-Natrix-HT-Reagents-512.html https://www.jenabioscience.com/crystallography-cryo-em/screening/crystal-screens/jbscreen-nuc-pro

Re: [ccp4bb] ITC question -dimer vs monomer

2019-10-03 Thread Rajiv gandhi.s
Dear Dr.BR There could be two possibilities, you could try to do titration of dimer into monomer loaded in cell or vice versa, and with subtraction of heat of dilution from protein-protein titration. These kind of molecular interaction involving distinct oligomer units need be addressed by any

Re: [ccp4bb] Reg: water pentagon at dimer interface

2019-09-27 Thread Rajiv gandhi.s
There are literature shown this kind of possiblity to have dimerization via water mediated interactions. But look whether in solution also they could form dimer or not. How to figure out it is not non specific, it is physiological relevant. Cheers SR On Fri, Sep 27, 2019, 5:04 PM Vijaykumar

Re: [ccp4bb] Optimization from needle shaped crystals

2019-09-08 Thread Rajiv gandhi.s
Dear prem, I am sharing my experience with needle crystal that worked for me. 1.First check that salt or a protein crystal by SDS PAGE or mass spectroscopy. 2. For improvement of morphology and size, you could try microseeding of your crushed crystal, generally needle crystal appear quickly,

Re: [ccp4bb] SEC and MALS

2019-08-27 Thread Rajiv gandhi.s
Because MALS can capture distinct migrant form of the same protein, sometimes protein with disorder and elongated structure behave differently in SEC. In SEC we can't distinguish them. Whereas MALS have scattering at three different angles, by that we can captures those multiple forms of the