New 2.10 release of XPLOR-NIH can now do a refinement against order parameters. You can get an idea what this refinement can be used for from the this paper.
- new parameter/topology file naming convention: NMR protein refinement should now use topology file protein.top and parameter file protein.par.
- new command: tclXplor which calls xplor -tcl. Can be used as command interpreter
- new potential term OrderPot to enable refinement against order parameters.
- update to PrePot from Junji Iwahara
- CSAPot: 15N CSAs are now supported.
- hbdb update from Alex Grishaev: Adds ability use multiple segments. Includes fixes to prevent program crashes.
General information about XPLOR-NIH:
"XPLOR-NIH is a structure determination program which builds on the X-PLOR program, including additional tools developed at the NIH. These tools include functionality for the following:
- 3J couplings
- 1J couplings
- 13C shifts
- 1H shifts
- T1/T2
- dipolar couplings
- radius of gyration
- CSA
- refinement using paramagnetic relaxation enhancement spectroscopy
- database base-base positioning potentials for DNA
- interface to the NMR graphics package VMD-XPLOR, downloadable separately.
- embedded Python and TCL interpreters.
- addition of Generalized Born code from Tom Simonson .
- support for computing swarms of structures in parallel using multiple computers.
- paramagnetic relaxation enhancement module (Python interface) based on the modified Solomon-Bloembergen equation and multiple structure representation for paramagnetic groups. This module contributed by Junji Iwahara. Please contact him at iwahara-at-helix.nih.gov(replace -at- with a @) for further information.
- The PASD/Marvin facility for automatic NOE assignment.
- the PARArestraints module for including paramagnetism-based NMR restraints in refinement.
- the bin/seq2psf script to generate psf file from sequence.
- includes the isac code for floating RDC alignment tensor.
H.J. Sass, G. Musco, S.J. Stahl, P.T. Wingfield and S.Grzesiek, J. Biomol. NMR 21: 275-280 (2001).
- merged hbdb code from A. Grishaev. ``An empirical pseudo-potential that encodes for the relative arrangement of two protein peptidyl units linked by a backbone-backbone hydrogen bond.''
- a new CSA potential in the Python interface.
- Removed arbitrary limits on all PSF parameters. Xplor-NIH startup size has been reduced by about 25MB, and it will handle systems as large as your computer's memory will allow.
- XPLOR-NIH also includes an new internal variable module (IVM) which allows one to perform efficient molecular dynamics and minimizations using internal coordinates, such as torsion angles. The IVM permits one to do combined torsion angle/rigid body dynamics, torsion angle/cartesian coordinate dynamics, etc. We have found that a 6th order predictory-corrector integrator utilizing a time-varying, automatically time step size provides large computational advantages over the other X-PLOR dynamics engines. "
Did you find this post helpful? |
Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
[KPWU blog] water refinement in Xplor-NIH
water refinement in Xplor-NIH
Starting at Xplor-NIH 2.26 (now it’s version 2.29 on Feb. 8th, 2012), official Xplor-NIH package provides an example script doing explicit solvent refinement. The short description made by Xplor-NIH author: ============ wrefine.py: refinement with explicit solvent and full electrostatics. Includes*rdcs, noes, jcoupling terms and dihedral restraints. This is a*work-in-progress. Please compare with other protocols. In*particular, http://stats.wordpress.com/b.gif?host=kpwu.wordpress.com&blog=76132&post=636&subd=kpwu&ref=&feed=1
Go to KPWU blog to read complete...
nmrlearner
News from NMR blogs
0
02-09-2012 08:16 AM
[Question from NMRWiki Q&A forum] shake routine and ncon parameter
shake routine and ncon parameter
Trying to do molecular dynamics with explicit water molecules I came across a problem with SHAKE routine:
shake reference = parameters bonds (hydrogen) (all) tolerance = 1.0e-06 nconstraints=8000end
and error message after this is:
X-PLOR>shake SHAKE> reference = parameters SHAKE> bonds (hydrogen) (all) SELRPN: 7142 atoms have been selected out of 11032 SELRPN: 11032 atoms have been selected out of 11032 SHKSET: reference = parameters %XREFIN-ERR: allocation for SHAKE-constraints exceeded ...
nmrlearner
News from other NMR forums
0
10-27-2011 11:42 PM
[KPWU blog] Install Xplor-NIH 2.26 on new iMac (10.6)
Install Xplor-NIH 2.26 on new iMac (10.6)
A short note for installation of xplor-nih 2.26 on iMac. Few months ago, I downloaded XPLOR-NIH 2.26 for Mac OS and installed it on my new iMac (core i3, 3.06 GHz). The default configuration script does not include “Intel Core i3″ *in the processor list (at xplor-nih-xxx/arch/getDarwinCPU). The solution to make the configuration is to http://stats.wordpress.com/b.gif?host=kpwu.wordpress.com&blog=76132&post=234&subd=kpwu&ref=&feed=1
Go to KPWU blog to read complete post.
nmrlearner
News from NMR blogs
0
12-25-2010 04:09 AM
[CNS Yahoo group] cns1.2 vs Xplor-NIH2.26
cns1.2 vs Xplor-NIH2.26
Hi all, I would like to know which are the differences between cns1.2 and XPLOR-NIH2.26 for NMR structure calculations. thanks simona
More...
nmrlearner
News from other NMR forums
0
11-26-2010 07:33 PM
[NMRwiki tweet] nmrwiki: What is the meaning of the GRPDLY parameter in @bruker #nmr systems?http://q
nmrwiki: What is the meaning of the GRPDLY parameter in @bruker #nmr systems?http://qa.nmrwiki.org/question/196/
nmrwiki: What is the meaning of the GRPDLY parameter in @bruker #nmr systems?http://qa.nmrwiki.org/question/196/
Source: NMRWiki tweets
nmrlearner
Twitter NMR
0
11-11-2010 04:33 PM
[Question from NMRWiki Q&A forum] Bruker GRPDLY Parameter
Bruker GRPDLY Parameter
I am new to working with Bruker-style NMR data and am experiencing confusion with regard to Bruker's digital filtering. Some experiments on our Bruker spectrometers result in valid decim/dspfvs/grpdly values in the acqus output file, but other spectrometers give a value of -1 for grpdly. Does anyone know what this value means? More importantly, how can I calculate how many points to left-shift the Bruker fid for offline processing when grpdly does not contain the value?
Thank you.
Check if somebody has answered this question on NMRWiki QA forum
nmrlearner
News from other NMR forums
0
11-11-2010 04:33 PM
[NMR paper] Theory and application of the maximum likelihood principle to NMR parameter estimatio
Theory and application of the maximum likelihood principle to NMR parameter estimation of multidimensional NMR data.
Related Articles Theory and application of the maximum likelihood principle to NMR parameter estimation of multidimensional NMR data.
J Biomol NMR. 1995 Apr;5(3):245-58
Authors: Chylla RA, Markley JL
A general theory has been developed for the application of the maximum likelihood (ML) principle to the estimation of NMR parameters (frequency and amplitudes) from multidimensional time-domain NMR data. A computer program (ChiFit)...