[gmx-users] Re: problem in g_membed

2013-07-29 Thread pavithrakb
Thank you both of you (Justin and Albert) sir.
Initially I was using dppc128 and now I changed to POPE 340 and still my
protein (its a GPCR protein) protrude out of the membrane (the same region;
two amino acids).
since you (Justin) you have mentioned that the protein must be completely
inside the membrane to avoid any instability, what must I do to avoid this
problem?
is something wrong with my protein?
The region protruding out is a loop. is it still a problem?
the protein's box size is 4.49101 4.74797 7.29103 (from protein.gro).
Kindly help.



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[gmx-users] Re: problem in g_membed

2013-07-29 Thread pavithrakb
sir,
the reason for selecting POPE doesn't have much valid reason. I mean, I have
referred previous works and in the recent work they have used POPE membrane
for my protein (the exact protein) simulation. I have searched literature on
selecting a membrane for simulation to know/understand why they have
selected the particular membrane. But couldn't find put the reason why?.
And, sorry I have misunderstood what you have mentioned about the protein
out of the box. I get the point now.
I have used editconf and have increased the Z dimension of the box. 
Now the protein fits inside the box and no protruding. Thank you sir.





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[gmx-users] Re: problem in g_membed

2013-07-29 Thread pavithrakb
I would have made a blunder by selecting the POPE membrane.
But, that paper (one which used POPE for human protein) was published in
ACS-Journal of Chemical Information and Modeling. 
I thought following high standard papers are trust worthy. 
Thank you so much sir. I will start learning the basics before continuing
the simulation.




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[gmx-users] Re: problem in g_membed

2013-07-29 Thread pavithrakb
Thank you so much sir.
the entire thread was highly useful.





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[gmx-users] Re: Simulating a semi-membrane protein

2013-07-23 Thread pavithrakb
Sir,
I'm new to simulation. is there any papers or materials (book or website) to
learn about the forcefields and their limitations. All the advice I get from
people is to select a ff and membrane based on the previous works on that
protein or protein family. I know its too much to ask but, can you please
suggest some papers/materials on forcefields and selecting a membrane. I'm
sure it will be useful to many beginners like me. 
Thankyou. 



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[gmx-users] Re: Simulating a semi-membrane protein

2013-07-23 Thread pavithrakb
Thank you both of you for taking time to help me..
This would be definitely useful. 
thank you so much. 



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[gmx-users] Simulating a semi-membrane protein

2013-07-22 Thread pavithrakb
Dear Users,
I'm not sure if the term I coined as semi-membrane protein is correct.
But My protein is half (alpha subunit) in membrane and other half (beta
subunit) outside the cell. 
is it possible to simulate such proteins? if So, how can we use membrane for
just one half?
Sorry if the question is stupid. just wondering...



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[gmx-users] Re: Simulating a semi-membrane protein

2013-07-22 Thread pavithrakb
Dear Sir,
Thank you.
I understand it now. But, when apply the force field, should I select the
membrane ff like gromos56 (like in your KALP tutorial) or will it be a
complex process to select a ff?




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[gmx-users] Re: Simulating a semi-membrane protein

2013-07-22 Thread pavithrakb
Dear Sir,
Thank you.
I understand it now. But, when apply the force field, should I select the
membrane ff like gromos56 (like in your KALP tutorial) or will it be a
complex process to select a ff? 



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[gmx-users] Re: problem in g_membed

2013-07-07 Thread pavithrakb
Dear Sir,
Thanks so much..
now what's the solution? Should I increase the box size?
Already I have centered the protein and fixed the POPE membrane size.
Can you tell me how to increase the box size? or is there any other
solution?




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