How to generate infinite system in gromacs usibng pbc ?

I want to generate an infinite peptide fibril as has been mentioned in attached publication. I am using gromacs but dont know which options to be used with -pbc option in .mdp file. please help

02 March 2018 4,423 0 View

Analyse peptide-water interaction from gromacs trajectory

Kindly suggest how to analyse H-bond between peptide and surrounding water molecules from a gromacs trajectory file.

04 May 2017 768 2 View

How to define parameters for solvent Trifluoroethanol for SCRF run using Gaussian ?

I want to perform calculation in solvent 2,2,2-Trifluoroethanol in gaussian but its not defined in gaussian. Please help me out how should I proceed for the same.

01 February 2017 5,540 5 View

Population analysis (Boltzmann distribution) from MD simulation ?

Dear All, please let me know how to perform population analysis (Boltzmann distribution) from MD simulation (in terms of energy). I have Phi/ Psi dihedral values from MD simulations (Gromacs), I...

31 December 2016 210 4 View

How to generate a SER dipeptide with O-GlcNAc (beta- glucosamine) attachment at side chain with OH group of SER ?

How to generate a SER dipeptide with O-GlcNAc (beta- glucosamine) attachment at side chain with OH group of SER. I have genetared the dipeptide with O-GlcNAc , It shows complete dipeptide when...

04 May 2016 966 2 View

How to analyze a particular region of my simulation box in GROMACS?

Hi, I am using GROMACS 5.1.4 to simulate water in contact with a surface. I am only interested to calculate some properties of water near the surface. Let's say at a distance of x nm from the...

03 March 2021 9,989 2 View

Why does blocking with my immunogenic peptide cause nuclear fluorescence in ICC?

Hi all, I am validating a polyclonal antibody raised against human ANT4, through WB and ICC. In most of my controls, the antibody shows very little off-target binding, but when I pre-incubate the...

03 March 2021 5,999 3 View

How can I calculate the rdf of water molecules around 'Na' ions that are closest(adsorbed) to the nanoparticle(solute)?

Hi, I want to calculate the radial distribution function for water molecules around the Na+ ions adsorbed on the surface of a spherical nanoparticle using the gromacs trajectory dynamically? For...

28 February 2021 5,650 1 View

How can I assign a velocity along one direction to CO2 molecules in a molecular dynamics simulation using GROMACS?

Dear all, I am trying to perform a MD simulation about the interaction between CO2 and a polymer. I create my model, solvate it and perform the NVT and NPT equilibration. Now I am not able to...

26 February 2021 10,014 3 View

How does GROMACS calculate the average structure of proteins?

I want to get a average structure from a pdb file containing multiple models. I used the command below: gmx cluster -f input.pdb -s topol.tpr -cutoff 20 -method gromos -av GROMACS...

25 February 2021 6,314 1 View

How to identify or create correct list from GROMACS options during analysis of trajectory ?

During topology preparation using pdb2gmx Protein_chain_A and Protein_chain_B were identified. However, when production MD was completed and I proceeded to do analysis, I find this list : Group...

23 February 2021 5,065 8 View

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23 February 2021 4,014 3 View

How to reduce static electricity of powder after lyophilization?

I am working on synthesizing and then purifying peptides using the SPPS system. After purification of the peptide, the peptide powder is obtained using a freeze dryer. When measuring the powder,...

22 February 2021 10,099 5 View

Can we remove the fmoc group after peptide cleavage?

I have synthesized the peptide using Fmoc based solid phase peptide synthesis. Also I have cleaved the peptide from the resin and lyophilized it, but later realized that, I forgot to deprotect the...

21 February 2021 4,537 3 View

How T cells recognise non-peptide antigens?

This might sound very basic question, but please share with me an explanation of how the T cell is activated when the antigen is not a peptide? What happens? And what are the molecules involved in...

21 February 2021 564 3 View