Re: [gmx-users] Thiolate cysteine

2013-05-06 Thread Justin Lemkul



On 5/6/13 7:03 AM, Sathish Kumar wrote:

  I want to do simulation of protein at pH 12, in this case experimentally
reported that the disulphide bonds of protein was broken and sulphurs
become S negative  . Can you please tell me making of disulphide as S-  and
S- is it correct and how to set force field to this.


Some force fields (like the Amber parameter sets and some others) have the CYM 
residue, which is the thiolate form of cysteine.  Find which force fields have 
this residue, read about their use, and make a choice based on what you find.


-Justin

--


Justin A. Lemkul, Ph.D.
Research Scientist
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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Re: [gmx-users] Thiolate cysteine

2013-05-06 Thread Sathish Kumar
Thank you sir


On Mon, May 6, 2013 at 4:39 PM, Justin Lemkul jalem...@vt.edu wrote:



 On 5/6/13 7:03 AM, Sathish Kumar wrote:

   I want to do simulation of protein at pH 12, in this case experimentally
 reported that the disulphide bonds of protein was broken and sulphurs
 become S negative  . Can you please tell me making of disulphide as S-
  and
 S- is it correct and how to set force field to this.


 Some force fields (like the Amber parameter sets and some others) have the
 CYM residue, which is the thiolate form of cysteine.  Find which force
 fields have this residue, read about their use, and make a choice based on
 what you find.

 -Justin

 --
 ==**==

 Justin A. Lemkul, Ph.D.
 Research Scientist
 Department of Biochemistry
 Virginia Tech
 Blacksburg, VA
 jalemkul[at]vt.edu | (540) 231-9080
 http://www.bevanlab.biochem.**vt.edu/Pages/Personal/justinhttp://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

 ==**==
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regards
M.SathishKumar
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