Alessandro Casoni wrote:
hi users,
I want to simulate a position restraint md.
pdb2gmx creates a correct protein.top and  a posre.itp file.
but when I use " define = -DPOSRES" I have this error:

Step 1004, time 2.008 (ps)  LINCS WARNING
relative constraint deviation after LINCS:
rms 0.026978, max 1.366297 (between atoms 646 and 647)
bonds that rotated more than 30 degrees:
atom 1 atom 2  angle  previous, current, constraint length
   646    647   90.0    0.2562   0.2366      0.1000

and the simulation gives me a fatal error...

in my gro file atom 646 and 647 are:
65ASN      N  646   8.608   5.187   2.517
65ASN      H  647   8.510   5.206   2.518

please, give me some tips...


This has to be the most frequently-reported problem. Therefore, there are thousands of posts in the list archive that may help. Also, from the wiki:

http://wiki.gromacs.org/index.php/Errors#LINCS.2FSETTLE.2FSHAKE_warnings

-Justin

Alessandro
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--
========================================

Justin A. Lemkul
Graduate Research Assistant
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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