AMBER Archive (2006)

Subject: RE: AMBER: antechamber

From: Ross Walker (ross_at_rosswalker.co.uk)
Date: Wed Jun 07 2006 - 11:56:01 CDT

Dear Steve,
 
Here is your error:
 

  MAXIMUM NUMBER OF ATOMS IN BFGS SEARCH EXCEDEED
 
  Max Degree = 180 NPAR= 387
 
  INCREASE MXATTS IN divcon.dim AND RECOMPILE

So try changing this, doing a make clean and then rebuilding. Note, you may
also want to consider splitting your system into smaller fragments if that
is possible. You will probably get a better charge fit this way. This is
especially true if you have buried atoms where grid based approaches don't
tend to do well.
 
All the best
Ross

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From: owner-amber_at_scripps.edu [mailto:owner-amber_at_scripps.edu] On Behalf Of
Steve Seibold
Sent: Wednesday, June 07, 2006 09:17
To: AMBER
Subject: AMBER: antechamber

I am attempting to generate lipid parameters using Antechamber. leaprc.gaff
does appear to contain all force field parameters and so no apparent
problems here. However, when I tried to calculate atomic charges, I started
running into problems. When using :

 

Antechamber -i LIP2.pdb -fi pdb -o LIP2 -fo perpi -nc 0 -c bcc

 

I get an error message in my divcon.out saying "Program terminated due to
errors" I have attached the file (divcon.out) along with my pdb file.
However, it still assigned charges in my perpi output file. I believe the
perpi charges (i.e. ANTECHAMBER_PREP.AC) are library values from AMBER
correct? I also got assigned charges AM1BCC.

 

 

I also attempted to use "resp". So, I used Gaussian to generate an output
file (pop=mk) and then used "espgen" to extract ESP information. However
when I ran:

 

Antechamber -I LIP2.ESP -fi gout -o LIP2 -fo perpi -nc -c resp

 

 

It appears to run, but I am suspicious. I let it run for 70 minutes and
still no print out ...nothing. So I killed it.

 

Does anyone know what I am doing wrong?

 

Thanks, Steve

 

 

 

 

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