Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Sagar De'Biomimic
Dear all, I forgot to mention the resolution for our structure. It's 3.2 A. -Sagar On Wed, May 27, 2015 at 4:33 PM, Sagar De'Biomimic < sagarbiophys...@gmail.com> wrote: > Dear all, > > We have solved a structure of Protein-DNA complex. In an ASU we have two > protein homodimers and two DNA dup

Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Pavel Afonine
Hi All, perhaps rank scaling of maps as described here Acta Cryst. (2014). D70, 2593-2606 instead of "sigma" scaling is a way to eliminate the ambiguity inherent to "sigma" scaling. Pavel On Wed, May 27, 2015 at 1:31 PM, Gerard Bricogne wrote: > Dear Sagar and Pavel, > > Yes, it may be

Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Gerard Bricogne
ut-off of 1.0 > > > Thierry > > -Original Message- > From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Gerard > Bricogne > Sent: Wednesday, May 27, 2015 8:32 AM > To: CCP4BB@JISCMAIL.AC.UK > Subject: Re: [ccp4bb] Validity of Modeling of

Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Fischmann, Thierry
UK] On Behalf Of Gerard Bricogne Sent: Wednesday, May 27, 2015 8:32 AM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels Dear Sagar and Pavel, Yes, it may be model bias, but you also have to bear in mind that the rmsd that

Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Gerard Bricogne
Dear Sagar and Pavel, Yes, it may be model bias, but you also have to bear in mind that the rmsd that is used as a unit in the choice of contouring level should not be thought of as the standard deviation of a Gaussian random variable and therefore implicitly associated to a "significance lev

Re: [ccp4bb] Validity of Modeling of Highly flexible region at low sigma levels

2015-05-27 Thread Pavel Afonine
Sagar, what you see may be model bias unless you calculated these maps without that region of molecule. Pavel On Wed, May 27, 2015 at 12:03 PM, Sagar De'Biomimic < sagarbiophys...@gmail.com> wrote: > Dear all, > > We have solved a structure of Protein-DNA complex. In an ASU we have two > protei