[ccp4bb] Hydrophobic/ vander waal forces

2021-07-02 Thread amit gaur
Hi everyone,
 I hope everything is going well with all of you. I want to
know that, Are hydrophobic and vander waal forces are similar? and what is
criteria for formation of these and interatomic distances needed to form
these interactions between amino acids? What kinds of atoms have propensity
to form these interactions?

Thank you,
-- 
*Dr. Amit Gaur*

*Research AssociateThomas Jefferson University*
*Department of Translational medicine*
*1020, Locust Street, Jefferson Alumni Hall*
*Philadelphia, PA 19107*



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[ccp4bb] hydrophobic forces

2020-10-25 Thread amit gaur
Hi All,
 I have a question that, I have a loop region with hydrophilic
residues(TNETRERE) that lie close to methionine. Can, repulsive forces may
occur because between methionine and hydrophilic residues?

-- 
*Dr. Amit Gaur*
*Post Doctoral Researcher*


*Thomas Jefferson University*



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[ccp4bb] Homology modeling

2020-08-14 Thread amit gaur
Hi All,

   I am trying to generate a model using comparative modeling. Can
anybody suggest the quality of the model based on procheck summary.

 +--<<<  P  R  O  C  H  E  C  K S  U  M  M  A  R  Y  >>>--+
 ||
 | /var/www/PROCHECK/Jobs/7358861/7358861.pdb   1.5 1253 residues |
 ||
*| Ramachandran plot:   87.9% core   10.2% allow1.4% gener0.4% disall |
 ||
*| All Ramachandrans:   67 labelled residues (out of1235) |
+| Chi1-chi2 plots:  3 labelled residues (out of 771) |
 | Side-chain params:5 better 0 inside  0 worse   |
 ||
*| Residue properties: Max.deviation: 4.9  Bad contacts:0 |
*| Bond len/angle:9.9Morris et al class:  1  1  2 |
 ||
 | G-factors   Dihedrals:  -0.13  Covalent:  -0.07Overall:  -0.10 |
 ||
*| Planar groups:90.0% within limits  10.0% highlighted  13 off graph |
 ||
 ++
   + May be worth investigating further.  * Worth investigating further.



Thanks,



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Re: [ccp4bb] technical question

2019-12-01 Thread amit gaur
Thanks every one. I tried this and worked pretty well.

On Fri, Nov 29, 2019 at 4:42 PM Robbie Joosten 
wrote:

> Or use the residue name MHO if SME has the wrong hand around the sulfur.
>
> Cheers,
> Robbie
>
> On 29 Nov 2019 21:47, Paul Emsley  wrote:
>
> On 29/11/2019 18:06, amit gaur wrote:
>
> > I want to replace a particular methionine in a pdbwith methionine
> sulfoxide( an oxidized form of
> > methionine). Can body please tell me how to do this? I am familiar with
> pymol, chimera and coot software.
>
> In Coot:
>
> Extensions -> Modelling -> Replace Residue -> SME -> Mutate
>
> 
>
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> --
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-- 
*Dr. Amit Gaur*


*Post Doctoral ResearcherPI: Dr. Ji-Fang ZhangThomas Jefferson University*
*1020, Locust Street, Suite 418*
*Philadelphia, PA 19107*



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[ccp4bb] technical question

2019-11-29 Thread amit gaur
Hi everbody,
I want to replace a particular methionine in a pdb with methionine
sulfoxide( an oxidized form of methionine). Can body please tell me how to
do this? I am familiar with pymol, chimera and coot software.
-- 
*Amit Gaur*

*Post Doctoral ResearcherThomas Jefferson University*
*1020, Locust Street, Suite 418*
*Philadelphia, PA 19107*



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[ccp4bb] Dimer in SDS-PAGE

2017-02-21 Thread amit gaur
Hi all,
  I am trying to purify a potassium ion channel from insect cell using
baculovirus expression system. I am not seeing monomer of this protein in
SDS instead a dimer appears.So,I increased DTT in SDS buffer but no change
and dimer was intact. In size exclusion this protein appeared as a tetramer
which is common oligomerizaton of potassium channel family with GYG motif.
Can any body suggest what should I do in this case?

Thanks and regards,


-- 
*Dr. Amit Gaur*


*Post Doctoral ResearcherPI: Dr. Ji-Fang ZhangThomas Jefferson University*
*1020, Locust Street, Suite 418*
*Philadelphia, PA 19107*